First Citizens BancShares (FCNCA) 10-K 24 Feb 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 22, 2021	Jun. 30, 2020
Entity Central Index Key	0000798941
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity File Number	001-16715
Entity Registrant Name	FIRST CITIZENS BANCSHARES INC /DE/
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	56-1528994
Entity Address, Address Line One	4300 Six Forks Road
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27609
City Area Code	(919)
Local Phone Number	716-7000
Title of 12(g) Security	Class B Common Stock, Par Value $1
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,346,993,887
Class A Common Stock
Title of 12(b) Security	Class A Common Stock, Par Value $1
Trading Symbol	FCNCA
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		8,811,220
Class B Common Stock
Entity Common Stock, Shares Outstanding		1,005,185
Preferred Stock
Title of 12(b) Security	Depositary Shares, Each Representing a 1/40th Interest in a Share of 5.375% Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol	FCNCP
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 362,048	$ 376,719
Overnight investments	4,347,336	1,107,844
Equity Securities, FV-NI	91,680	82,333
Investment securities available for sale	7,014,243	7,059,674
Investment securities held to maturity	2,816,982	30,996
Loans held for sale	124,837	67,869
Loans and leases	32,791,975	28,881,496
Less allowance for loan and lease losses	(224,314)	(225,141)
Net Loans and Leases	32,567,661	28,656,355
Premises and equipment	1,251,283	1,244,396
Other Real Estate	50,890	46,591
Income earned not collected	145,694	123,154
Goodwill	350,298	349,398
Intangible Assets, Net (Excluding Goodwill)	50,775	68,276
Other assets	783,953	610,891
Total assets	49,957,680	39,824,496
Deposits [Abstract]
Noninterest-bearing	18,014,029	12,926,796
Interest-bearing	25,417,580	21,504,440
Total deposits	43,431,609	34,431,236
Securities Sold under Agreements to Repurchase	641,487	442,956
Federal Home Loan Bank Advances	655,175	572,185
Subordinated Debt	504,518	163,412
Other Borrowings	88,470	148,318
FDIC shared-loss payable	15,601	112,395
Other liabilities	391,552	367,810
Total liabilities	45,728,412	36,238,312
Shareholders' Equity
Preferred stock - $0.01 par value (10,000,000 shares authorized; 345,000 and no shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively)	339,937	0
Surplus	0	44,081
Retained earnings	3,867,252	3,658,197
Accumulated other comprehensive income (loss)	12,263	(126,723)
Total shareholders' equity	4,229,268	3,586,184
Total liabilities and shareholders' equity	49,957,680	39,824,496
Class A Common Stock
Shareholders' Equity
Common Stock, Value, Issued	8,811	9,624
Class B Common Stock
Shareholders' Equity
Common Stock, Value, Issued	$ 1,005	$ 1,005

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment securities held to maturity, fair value	$ 2,838,499	$ 30,996
Total investment securities available for sale, cost	6,911,965	7,052,152
Investments in ME securities, cost	$ 84,837	$ 59,262
Class A Common Stock
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shared authorized	16,000,000	16,000,000
Common stock, shares issued	8,811,220	9,624,310
Common stock, shares outstanding	8,811,220	9,624,310
Class B Common Stock
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shared authorized	2,000,000	2,000,000
Common stock, shares issued	1,005,185	1,005,185
Common stock, shares outstanding	1,005,185	1,005,185
Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	345,000	0
Preferred stock, shares outstanding	345,000	0

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income
Loans and leases	$ 1,332,720	$ 1,217,306	$ 1,073,051
Investment securities interest and dividend income	144,459	160,460	150,709
Overnight investments	6,847	26,245	21,997
Total interest income	1,484,026	1,404,011	1,245,757
Interest expense
Deposits	66,635	76,254	22,483
Securities sold under customer repurchase agreements	1,610	1,995	1,594
Federal Home Loan Bank borrowings	9,763	5,472	5,801
Subordinated debt	16,074	7,099	6,277
Other borrowings	1,775	1,822	702
Total interest expense	95,857	92,642	36,857
Net interest income	1,388,169	1,311,369	1,208,900
Provision for credit losses	58,352	31,441	28,468
Net interest income after provision for credit losses	1,329,817	1,279,928	1,180,432
Noninterest income
Merchant services, net	24,122	24,304	24,504
Realized gains on investment securities available for sale, net	60,253	7,115	351
Marketable equity securities gains (losses), net	29,395	20,625	(7,610)
Gain on extinguishment of debt	0	0	26,553
Other	7,446	18,431	19,700
Total noninterest income	476,750	415,861	400,149
Noninterest expense
Salaries and wages	590,020	551,112	527,691
Employee benefits	132,244	120,501	118,203
Occupancy expense	117,169	111,179	109,169
Equipment expense	115,535	112,290	102,909
Processing fees paid to third parties	44,791	29,552	30,017
FDIC insurance expense	12,701	10,664	18,890
Collection and foreclosure-related expenses	13,658	11,994	16,567
Merger-related expenses	17,450	17,166	6,462
Other	145,117	139,283	147,063
Total noninterest expense	1,188,685	1,103,741	1,076,971
Income before income taxes	617,882	592,048	503,610
Income taxes	126,159	134,677	103,297
Net income	491,723	457,371	400,313
Less: Preferred stock dividends	14,062	0	0
Net income available to common shareholders	$ 477,661	$ 457,371	$ 400,313
Average shares outstanding (in shares)	10,056,654	11,141,069	11,938,439
Net income per share	$ 47.50	$ 41.05	$ 33.53
Cash dividends (in dollars per share)	$ 1.67	$ 1.60	$ 1.45
Wealth management services
Noninterest income
Revenue from contracts with customers	$ 102,776	$ 99,241	$ 97,966
Service charges on deposit accounts
Noninterest income
Revenue from contracts with customers	87,662	105,191	105,486
Cardholder services, net
Noninterest income
Revenue from contracts with customers	74,291	69,078	65,478
Mortgage income
Noninterest income
Revenue from contracts with customers	39,592	21,126	16,433
Merchant services, net
Noninterest income
Revenue from contracts with customers	30,911	31,644	30,606
Insurance commissions
Noninterest income
Revenue from contracts with customers	14,544	12,810	12,702
ATM income
Noninterest income
Revenue from contracts with customers	$ 5,758	$ 6,296	$ 7,980

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 491,723	$ 457,371	$ 400,313
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
Unrealized gains on securities available for sale arising during the period	155,009	64,644	29,170
Tax effect	(35,652)	(14,868)	(6,709)
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes	(60,253)	(7,115)	(351)
Tax effect	13,858	1,636	81
Unrealized gains on securities available for sale arising during the period, net of tax	72,962	44,297	22,191
Unrealized losses on securities available for sale transferred to held to maturity [Abstract]
Unrealized gains (losses) on securities available for sale transferred from/to held to maturity	5,894	72,512	(109,507)
Tax effect	(1,356)	(16,678)	25,186
Reclassification adjustment for accretion of unrealized (gains) losses on securities available for sale transferred to held to maturity	(495)	19,889	17,106
Tax effect	114	(4,574)	(3,934)
Total change in unrealized gains (losses) on securities available for sale transferred to held to maturity, net of tax	4,157	71,149	(71,149)
Defined benefit pension items:
Actuarial gains (losses) arising during the period	55,023	(20,049)	(32,012)
Tax effect	(12,656)	4,611	7,363
Amortization of actuarial losses and prior service cost	25,324	10,981	13,981
Other Comprehensive Income (Loss), Defined Benefit Plan, Amortization of Gains (Losses) And Prior Service Cost, Tax	5,824	2,525	3,216
Total change from defined benefit plans, net of tax	(61,867)	6,982	13,884
Net current period other comprehensive income	138,986	108,464	(62,842)
Total comprehensive income	$ 630,709	$ 565,835	$ 337,471

Consolidated Statements of Chan

Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A Common Stock	Class B Common Stock	Common Stock	Common StockClass A Common Stock	Common StockClass B Common Stock	Preferred Stock	Surplus	SurplusClass A Common Stock	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsClass A Common Stock	Retained EarningsClass B Common Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2017	$ 3,334,064					$ 11,005	$ 1,005	$ 0	$ 658,918		$ 2,785,430				$ (122,294)
Beginning balance (Cumulative effect of adoption of ASU 2016-01) at Dec. 31, 2017												$ 18,715				$ (18,715)
Beginning balance (Cumulative effect of adoption of ASU 2018-02) at Dec. 31, 2017												31,336				$ (31,336)
Beginning balance (Cumulative effect of adoption of ASC 326) at Dec. 31, 2017		$ 36,943										$ 36,943
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	400,313										400,313
Other comprehensive income (loss), net of tax	(62,842)														(62,842)
Stock repurchases during period			$ 165,338			382				$ 164,956
Cash dividends	(1,458)		(15,785)								(1,458)		$ (15,785)
Ending balance at Dec. 31, 2018	3,488,954					10,623	1,005	0	493,962		3,218,551				(235,187)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	457,371										457,371
Other comprehensive income (loss), net of tax	108,464														108,464
Stock repurchases during period	450,800		450,880			999				449,881
Cash dividends			(16,117)	$ (1,608)		0	0		0				(16,117)	$ (1,608)	0
Ending balance at Dec. 31, 2019	3,586,184				$ 1,005	9,624		0	44,081		3,658,197				(126,723)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	491,723										491,723
Other comprehensive income (loss), net of tax	138,986														138,986
Issuance of preferred stock	339,937							339,937
Stock repurchases during period	333,800		333,755			813				$ 44,081			288,861
Cash dividends			$ (15,010)	$ (1,678)									$ (15,010)	$ (1,678)
Preferred stock dividends declared	14,062										14,062
Ending balance at Dec. 31, 2020	$ 4,229,268					$ 8,811	$ 1,005	$ 339,937	$ 0		$ 3,867,252				$ 12,263

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 1.67	$ 1.60	$ 1.45
Class A Common Stock
Statement of Stockholders' Equity [Abstract]
Stock repurchases (shares)	813,090	998,910	382,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES
Net income	$ 491,723	$ 457,371	$ 400,313
Adjustments to reconcile net income to cash provided by operating activities:
Provision for credit losses	58,352	31,441	28,468
Deferred tax expense (benefit)	(25,535)	54,598	(13,377)
Change in current taxes payable	(5,894)	(19,564)	23,353
Depreciation	108,641	103,828	96,781
Change in accrued interest payable	(8,683)	14,412	(240)
Change in income earned not collected	(21,982)	(4,151)	(10,785)
Gain on acquisitions	(100,000)	(3,592)	(50,000)
Realized gains on investment securities available for sale, net	(60,253)	(7,115)	(351)
Marketable equity securities (gains) losses, net	(29,395)	(20,625)	7,610
Gain on extinguishment of debt	0	0	(26,553)
Origination of loans held for sale	(1,078,096)	(736,015)	(593,307)
Proceeds from sale of loans held for sale	1,045,937	731,803	608,549
Gain on sale of loans	(37,594)	(15,183)	(11,210)
Loss on sale of other real estate	4,056	2,664	4,390
Net amortization of premiums and discounts	(8,513)	(27,263)	(32,291)
Amortization of intangible assets	32,801	23,861	23,648
Net change in other liabilities	(12,149)	(5,927)	(5,258)
Net change in other assets	(7,286)	(24,274)	(5,076)
Net change in other liabilities	(6,115)	(15,992)	9,105
Net cash provided by operating activities	340,015	540,277	453,769
INVESTING ACTIVITIES
Net change in loans outstanding	(3,803,188)	(1,282,880)	(1,023,885)
Payments to Acquire Available-for-sale Securities	(8,678,543)	(4,705,038)	(1,451,287)
Purchases of investment securities held to maturity	(1,633,165)	(223,598)	(97,827)
Purchases of marketable equity securities	(333,140)	(26,166)	(2,818)
Proceeds from maturities of investment securities held to maturity	301,347	341,077	296,632
Proceeds from maturities of investment securities available for sale	2,791,291	2,345,512	1,664,730
Proceeds from Sale of Available-for-sale Securities	4,585,002	2,308,856	360,218
Proceeds from sales of marketable equity securities	352,835	56,749	9,528
Net change in overnight investments	(3,204,363)	(65,181)	601,979
Proceeds from sale of portfolio loans	13,368	24,247	9,591
Net Payment to the FDIC for Termination of Loss Share Agreements	(99,468)	0	0
Proceeds from Sale of Other Real Estate Held-for-investment	28,280	25,918	28,128
Proceeds from Sale of Property, Plant, and Equipment	1,369	132	1,721
Additions to premises and equipment	(133,384)	(121,077)	(140,444)
Business acquisitions, net of cash acquired	(59,999)	(236,728)	(155,126)
Net cash (used) provided by investing activities	(9,871,758)	(1,558,177)	101,140
FINANCING ACTIVITIES
Net change in time deposits	(1,010,190)	284,611	33,023
Net change in demand and other interest-bearing deposits	9,989,107	1,154,815	457,196
Net change in short-term borrowings	(96,746)	(27,703)	(246,517)
Repayment of long-term obligations	(86,737)	(73,284)	(752,447)
Origination of long-term obligations	400,000	200,000	125,000
Net proceeds from subordinated notes issuance	345,849	0	0
Net proceeds from preferred stock issuance	339,937	0	0
Repurchase of common stock	(333,755)	(453,123)	(163,095)
Cash dividends paid	(30,393)	(18,137)	(16,779)
Net cash provided (used) by financing activities	9,517,072	1,067,179	(563,619)
Change in cash and due from banks	(14,671)	49,279	(8,710)
Cash and due from banks at beginning of period	376,719	327,440	336,150
Cash and due from banks at end of period	362,048	376,719	327,440
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Interest	104,567	78,230	37,097
Income taxes	116,583	83,038	73,806
Premises and equipment acquired through finance leases and other financing arrangements	11,635	14,639	23,375
Dividends declared but not paid	4,613	4,256	4,668
Net reclassification of portfolio loans from (to) loans held for sale	1,687	22,034	(2,433)
Transfer of investment securities available for sale to (from) held to maturity		(2,080,617)
Transfer of investment securities available for sale to (from) held to maturity	1,460,745		2,485,761
Transfer of investment securities available for sale to marketable equity securities	0	0	107,578
Transfers of premises and equipment to other real estate	15,187	7,045	1,622
Transfers of premises and equipment to other real estate	0	0	12,196
Common Stock Repurchases, Unsettled	$ 0	$ 0	$ 2,243

Accounting Policies and Basis o

Accounting Policies and Basis of Presentation	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Accounting Policies and Basis of Presentation	ACCOUNTING POLICIES AND BASIS OF PRESENTATION Nature of Operations First Citizens BancShares, Inc. (“we,” “us,” “our,” “BancShares,”) is a financial holding company organized under the laws of Delaware and conducts operations through its banking subsidiary, First-Citizens Bank & Trust Company (“FCB,” or “the Bank”), which is headquartered in Raleigh, North Carolina. BancShares and its subsidiaries operate 542 branches in 19 states predominantly located in the Southeast, Mid-Atlantic, Midwest and Western United States (the “U.S.”). BancShares seeks to meet the financial needs of individuals and commercial entities in its market areas through a wide range of retail and commercial banking services. Loan services include various types of commercial, business and consumer lending. Deposit services include checking, savings, money market and time deposit accounts. First Citizens Wealth Management provides holistic, goals-based advisory services encompassing a broad range of client deliverables. These deliverables include wealth planning, discretionary investment advisory services, insurance, brokerage, defined benefit and defined contribution services, private banking, trust, fiduciary, philanthropy and special asset services. Principles of Consolidation and Basis of Presentation The accounting and reporting policies of BancShares and its subsidiaries are in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and general practices within the banking industry. The consolidated financial statements of BancShares include the accounts of BancShares and its subsidiaries, certain partnership interests and variable interest entities. All significant intercompany accounts and transactions are eliminated upon consolidation. BancShares operates with centralized management and combined reporting; thus, BancShares operates as one consolidated reportable segment. Variable interest entities (“VIE”) are legal entities that either do not have sufficient equity to finance their activities without the support from other parties or whose equity investors lack a controlling financial interest. FCB has investments in certain partnerships and limited liability entities that have been evaluated and determined to be VIEs. Consolidation of a VIE is appropriate if a reporting entity holds a controlling financial interest in the VIE and is the primary beneficiary. FCB is not the primary beneficiary and does not hold a controlling interest in the VIEs as it does not have the power to direct the activities that most significantly impact the VIEs’ economic performance. As such, assets and liabilities of these entities are not consolidated into the financial statements of BancShares. The recorded investment in these entities is reported within other assets. Reclassifications In certain instances, amounts reported in prior years’ consolidated financial statements have been reclassified to conform to the current financial statement presentation. Such reclassifications had no effect on previously reported shareholders’ equity or net income. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions impacting the amounts reported. Actual results could differ from those estimates. The estimates BancShares considers significant are the allowance for credit losses, fair value measurements, and income taxes. Business Combinations BancShares accounts for all business combinations using the acquisition method of accounting. Under this method, acquired assets and assumed liabilities are included with the acquirer’s accounts as of the date of acquisition, with any excess of purchase price over the fair value of the net assets acquired recognized as either finite lived intangibles or capitalized as goodwill. In addition, acquisition-related and restructuring costs are recognized as period expenses as incurred. See Note B, Business Combinations, for additional information. Cash and Cash Equivalents Cash and cash equivalents include cash and due from banks, interest-bearing deposits with banks and federal funds sold. Cash and cash equivalents have initial maturities of three months or less. The carrying value of cash and cash equivalents approximates its fair value due to its short-term nature. Debt Securities BancShares classifies debt securities as held to maturity (“HTM”) or available for sale (“AFS”). Debt securities are classified as HTM when BancShares has the intent and ability to hold the securities to maturity. HTM securities are reported at amortized cost. Other debt securities are classified as AFS and reported at estimated fair value, with unrealized gains and losses, net of income taxes, reported in Accumulated Other Comprehensive Income (“AOCI”). Amortization of premiums and accretion of discounts for debt securities are recorded in interest income. Realized gains and losses from the sale of debt securities are determined by specific identification on a trade date basis and are included in noninterest income. BancShares performs pre-purchase due diligence and evaluates the credit risk of AFS and HTM debt securities purchased directly into our portfolio or via acquisition. If securities have evidence of more than insignificant credit deterioration since issuance, they are designated as purchased credit deteriorated (“PCD”). P CD debt securities are recorded at fair value at the date of acquisition, which includes an associated allowance for credit losses (“ACL”) that is added to the purchase price or fair value to arrive at the Day 1 amortized cost basis. Excluding the ACL, the difference between the purchase price and the Day 1 amortized cost is amortized or accreted to interest income over the contractual life of the securities using the effective interest method. For AFS debt securities, management performs a quarterly analysis of the investment portfolio to evaluate securities currently in an unrealized loss position for potential credit-related impairment. If BancShares intends to sell a security, or does not have the intent and ability to hold a security before recovering the amortized cost, the entirety of the unrealized loss is immediately recorded in earnings. For the remaining securities, an analysis is performed to determine if any portion of the unrealized loss recorded relates to credit impairment. If credit-related impairment exists, the amount is recorded through the ACL and related provision. This review includes indicators such as changes in credit rating, delinquency, bankruptcy or other significant news event impacting the issuer. BancShares’ portfolio of HTM debt securities is made up of mortgage-backed securities issued by government agencies and government sponsored entities. Given the historically strong credit rating of the U.S. Treasury and the long history of no credit losses on debt securities issued by government agencies and government sponsored entities, we determined zero expected credit losses on the HTM portfolio. Equity Securities Equity securities are recorded on a trade date basis and measured at fair value. Realized and unrealized gains and losses are determined by specific identification and are included in noninterest income. Non-marketable equity securities are securities with no readily determinable fair values and are measured at cost. BancShares evaluates its non-marketable equity securities for impairment and recoverability of the recorded investment by considering positive and negative evidence, including the profitability and asset quality of the issuer, dividend payment history and recent redemption experience. Impairment is assessed at each reporting period and if identified, is recognized in noninterest expense. Non-marketable equity securities were $11.6 million and $12.5 million at December 31, 2020 and 2019, respectively, and are included in other assets. Other Securities Membership in the Federal Home Loan Bank (“FHLB”) network requires ownership of FHLB restricted stock. This stock is restricted as it may only be sold to the FHLB and all sales must be at par. Accordingly, the FHLB restricted stock is carried at cost, less any applicable impairment charges and is recorded within other assets. FHLB restricted stock was $45.4 million and $43.0 million at December 31, 2020 and 2019, respectively. Additionally, BancShares holds approximately 354,000 shares of Visa Class B common stock. Visa Class B shares are not considered to have a readily determinable fair value and are recorded at $0. Investments in Qualified Affordable Housing Projects BancShares and FCB have investments in qualified affordable housing projects primarily for the purposes of fulfilling Community Reinvestment Act requirements and obtaining tax credits. These investments are accounted for using the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received, and the net investment performance is recognized in the income statement as a component of income tax expense. All investments held in qualified affordable housing projects qualify for the proportional amortization method and totaled $163.9 million and $167.8 million at December 31, 2020 and 2019, respectively, and are included in other assets. Loans Held For Sale BancShares elected to apply the fair value option for residential mortgage loans originated to be sold to investors. Gains and losses on sales of mortgage loans are recognized within mortgage income. Loans and Leases BancShares’ accounting methods for loans and leases depends on whether they are originated or purchased, and if purchased, whether or not the loans reflect more than insignificant credit deterioration since origination as of the date of acquisition. Non-Purchased Credit Deteriorated Loans Non-Purchased Credit Deteriorated (“Non-PCD”) loans consist of loans originated by BancShares and loans purchased from other institutions that do not reflect more than insignificant credit deterioration at acquisition. Originated loans for which management has the intent and ability to hold for the foreseeable future are classified as held for investment and carried at the principal amount outstanding net of any unearned income, charge-offs and unamortized fees and costs. Nonrefundable fees collected and certain direct costs incurred related to loan originations are deferred and recorded as an adjustment to loans outstanding. The net amount of the nonrefundable fees and costs is amortized to interest income over the contractual lives using methods that approximate a constant yield. Purchased loans which do not reflect more than insignificant credit deterioration at acquisition are classified as non-PCD loans. These loans are recorded at fair value at the date of acquisition and an initial allowance is recorded on these assets as provision expense at the date of acquisition. The difference between the fair value and the unpaid principal balance at the acquisition date is amortized or accreted to interest income over the contractual life of the loan using the effective interest method. Purchased Credit Deteriorated Loans Purchased loans which reflect a more than insignificant credit deterioration since origination as of the date of acquisition are classified as PCD and are recorded at acquisition-date amortized cost, which is the purchase price or fair value in a business combination, plus our initial ACL. Excluding the ACL, the difference between the unpaid principal balance and the acquisition date amortized cost is amortized or accreted to interest income over the contractual life of the loan using the effective interest method. The performance of all loans within the BancShares portfolio is subject to a number of external risks, including but not limited to changes in the overall health of the economy, declines in real estate or other collateral values, changes in the demand for products and services and personal events, such as death, disability or change in marital status. BancShares evaluates and reports its non-PCD and PCD loan portfolios separately, and each non-PCD portfolio is further divided into commercial and consumer segments based on the type of borrower, purpose, collateral and/or our underlying credit management processes. Additionally, non-PCD commercial and consumer loans are assigned to loan classes, which further disaggregate the loan portfolio. PCD loans are reported as a single loan segment and class. Upon adoption of Accounting Standard Codification (“ASC”) 326, owner occupied and non-owner occupied commercial real estate were segregated into separate classes within the commercial segment. Similarly, consumer auto was segregated into its own class within the consumer segment. These enhancements were made to capture the unique credit characteristics used in our current expected credit loss (“CECL”) models. Information for reporting periods beginning after January 1, 2020 are presented in accordance with ASC 326 and reflect changes to the respective classes, while prior period amounts continue to be reported in accordance with previously applicable GAAP and have not been reclassified to conform to the current financial statement presentation. Small Business Administration Paycheck Protection Program The Small Business Administration Paycheck Protection Program (“SBA-PPP”) is one of the centerpieces of the Coronavirus Aid Relief and Economic Security Act (the “CARES Act”), which was passed on March 27, 2020 in response to the outbreak of coronavirus (“COVID-19”) and was supplemented with subsequent legislation. Overseen by the U.S. Treasury Department, the SBA-PPP offered cash-flow assistance to nonprofit and small business employers through guaranteed loans for expenses incurred between February 15, 2020, and August 8, 2020. Borrowers are eligible for forgiveness of principal and accrued interest on SBA-PPP loans to the extent that the proceeds were used to cover eligible payroll costs, interest costs, rent, and utility costs over a period of between eight and 24-weeks after the loan was made as long as the borrower retains its employees and their compensation levels. The CARES Act authorized the SBA to temporarily guarantee these loans. The SBA began processing forgiveness payments during the fourth quarter of 2020. The Consolidated Apportions Act 2021 was signed into law during the fourth quarter of 2020 and contained provisions for new funding of SBA-PPP loans. We began accepting applications for this round of funding beginning in the first quarter of 2021. Due to the unique nature of these provisions, SBA-PPP loans have been disclosed as a separate loan class. Origination fees received from the SBA are capitalized into the carrying amount of the loans. The deferred fee income, net of origination costs, is recognized over the life of the loan as an adjustment to yield using the effective interest method. The following represent our classes of loans as of January 1, 2020 upon adoption of ASC 326 (with the exception of SBA-PPP, which was added during second quarter 2020): Commercial loans and leases Construction and land development - Construction and land development consists of loans to finance land for commercial development of real property and construction of multifamily apartments or other commercial properties. These loans are highly dependent on the supply and demand for commercial real estate as well as the demand for newly constructed residential homes and lots acquired for development. Deterioration in demand could result in decreased collateral values, which could make repayments of outstanding loans difficult for customers. Owner occupied commercial mortgage - Owner occupied commercial mortgages consists of loans to purchase or refinance owner occupied nonresidential properties. This includes office buildings, other commercial facilities and farmland. Commercial mortgages secured by owner occupied properties are primarily dependent on the ability of borrowers to achieve business results consistent with those projected at loan origination. While these loans and leases are collateralized by real property in an effort to mitigate risk, it is possible the liquidation of collateral will not fully satisfy the obligation. Non-owner occupied commercial mortgage - Non-owner occupied commercial mortgage consists of loans to purchase or refinance investment nonresidential properties. This includes office buildings and other facilities rented or leased to unrelated parties, as well as farmland and multifamily properties. The primary risk associated with income producing commercial mortgage loans is the ability of the income-producing property that collateralizes the loan to produce adequate cash flow to service the debt. While these loans and leases are collateralized by real property in an effort to mitigate risk, it is possible the liquidation of collateral will not fully satisfy the obligation. Commercial and industrial and leases - Commercial and industrial loans consist of loans or lines of credit to finance accounts receivable, inventory or other general business needs, business credit cards, and lease financing agreements for equipment, vehicles, or other assets. The primary risk associated with commercial and industrial and lease financing loans is the ability of borrowers to achieve business results consistent with those projected at origination. Failure to achieve these projections presents risk the borrower will be unable to service the debt consistent with the contractual terms of the loan or lease. SBA-PPP - These loans were originated as part of the SBA-PPP to finance payroll and other costs for nonprofit and small businesses impacted by the COVID-19 pandemic. These loans are guaranteed by the SBA and borrowers have the ability to qualify for loan forgiveness through the U.S. Treasury. Consumer loans Residential mortgage - Residential mortgage consists of loans to purchase or refinance the borrower’s primary dwelling, secondary residence or vacation home and are often secured by 1-4 family residential properties. Significant and rapid declines in real estate values can result in borrowers having debt levels in excess of the current market value of the collateral. Revolving mortgage - Revolving mortgage consists of home equity lines of credit and other lines of credit or loans secured by first or second liens on the borrower’s primary residence. These loans are secured by both senior and junior liens on the residential real estate and are particularly susceptible to declining collateral values. This risk is elevated for loans secured by junior lines as a substantial decline in value could render the junior lien position effectively unsecured. Construction and land development - Construction and land development consists of loans to construct a borrower’s primary or secondary residence or vacant land upon which the owner intends to construct a dwelling at a future date. These loans are typically secured by undeveloped or partially developed land in anticipation of completing construction of a 1-4 family residential property. There is risk these construction and development projects can experience delays and cost overruns exceeding the borrower’s financial ability to complete the project. Such cost overruns can result in foreclosure of partially completed and unmarketable collateral. Consumer auto loans - Consumer auto loans consist of installment loans to finance purchases of vehicles. These loans include direct auto loans originated in bank branches, as well indirect auto loans originated through agreements with auto dealerships. The value of the underlying collateral within this class is at risk of potential rapid depreciation which could result in unpaid balances in excess of the collateral. Other consumer - Other consumer loans consist of loans to finance unsecured home improvements, student loans and revolving lines of credit that can be secured or unsecured, including personal credit cards. The value of the underlying collateral within this class is at risk of potential rapid depreciation which could result in unpaid balances in excess of the collateral. Loans and Leases - (Prior to Adoption of ASC 326) Prior to the adoption of ASC 326, BancShares’ accounting methods for loans and leases depended on whether they were originated or purchased, and if purchased, whether or not the loans reflected credit deterioration at the date of acquisition. Non-Purchased Credit Impaired (“Non-PCI”) Loans Non-PCI loans consisted of loans originated by BancShares or loans purchased from other institutions that did not reflect credit deterioration at acquisition. Originated loans for which management had the intent and ability to hold for the foreseeable future were classified as held for investment and carried at the principal amount outstanding net of any unearned income, charge-offs and unamortized fees and costs. Nonrefundable fees collected and certain direct costs incurred related to loan originations were deferred and recorded as an adjustment to loans outstanding. The net amount of the nonrefundable fees and costs was amortized to interest income over the contractual lives using methods that approximated a constant yield. Purchased loans which did not reflect credit deterioration at acquisition were classified as non-PCI loans. These loans were recorded at fair value at the date of acquisition. The difference between the fair value and the unpaid principal balance at the acquisition date was amortized or accreted to interest income over the contractual life of the loan using the effective interest method. Purchased Credit Impaired (“PCI”) Loans Purchased loans which reflected credit deterioration since origination, such that it was probable at acquisition that BancShares would be unable to collect all contractually required payments, were classified as PCI loans. PCI loans were recorded at fair value at the date of acquisition. If the timing and amount of the future cash flows could be reasonably estimated, any excess of cash flows expected at acquisition over the estimated fair value were recognized as interest income over the life of the loans using the effective yield method. Subsequent to the acquisition date, increases in cash flows over those expected at the acquisition date were recognized prospectively as interest income. Decreases in expected cash flows due to credit deterioration were recognized by recording an allowance for loan losses. In the event of prepayment, the remaining unamortized amount was recognized in interest income. To the extent possible, PCI loans were aggregated into pools based upon common risk characteristics and each pool was accounted for as a single unit. The performance of all loans within the BancShares portfolio was subject to a number of external risks, including changes in the overall health of the economy, declines in real estate values, changes in the demand for products and services and personal events, such as death, disability or change in marital status. BancShares evaluated and reported its non-PCI and PCI loan portfolios separately, and each portfolio was further divided into commercial and non-commercial segments based on the type of borrower, purpose, collateral and/or our underlying credit management processes. Nonperforming Assets and Troubled Debt Restructurings Nonperforming Assets Nonperforming assets (“NPAs”) include nonaccrual loans, past due debt securities and other real estate owned. All loans are classified as past due when the payment of principal and interest based upon contractual terms is 30 days or greater delinquent. Loans are generally placed on nonaccrual when principal or interest becomes 90 days past due or when it is probable the principal or interest is not fully collectible. When loans are placed on nonaccrual, all previously uncollected accrued interest is reversed from interest income and the ongoing accrual of interest is discontinued. All payments received thereafter are applied as a reduction of the remaining principal balance as long as doubt exists as to the ultimate collection of the principal. Loans and leases are generally removed from nonaccrual status when they become current for a sustained period of time and there is no longer concern as to the collectability of principal and interest. Debt securities are also classified as past due when the payment of principal and interest based upon contractual terms is 30 days delinquent or greater. Missed interest payments on debt securities are rare. We review all debt securities with delinquent interest and immediately charge off any accrued interest determined to be uncollectible. Troubled Debt Restructurings A loan is considered a troubled debt restructuring (“TDR”) when both a modification to a borrower’s debt agreement is made and a concession is granted for economic or legal reasons related to a borrower’s financial difficulties that otherwise would not be granted. TDR concessions could include short-term deferrals of interest, modifications of payment terms or, in certain limited instances, forgiveness of principal or interest. Loans restructured as a TDR are treated and reported as such for the remaining life of the loan. TDR loans can be nonaccrual or accrual, depending on the individual facts and circumstances of the borrower. In circumstances where a portion of the loan balance is charged-off, the remaining balance is typically classified as nonaccrual. Allowance for Credit Losses Loans Loans within the various reporting classes are segregated into pools with similar risk characteristics and models are built to estimate the ACL. These loan level ACL models estimate the probability of default and loss given default for individual loans within the risk pool based on historical loss experience, borrower characteristics, collateral type, forecasts of relevant economic conditions, expected future recoveries and other factors. Pools for estimating the ACL are aggregated into loan classes, as described above, which roll up into commercial and consumer loan segments. Non-PCD and PCD loans are modeled together within the loan level models using acquired and PCD indicator variables to provide differentiation of individual loan risk. BancShares uses a two The ACL for SBA-PPP loans originated during 2020 are separately evaluated given the explicit government guarantee. This analysis, which incorporated historical experience with similar SBA guarantees and underwriting, concluded the likelihood of loss was remote and therefore these loans were assigned a zero expected credit loss in the ACL. The ACL represents management’s best estimate of credit losses expected over the life of the loan, adjusted for expected contractual payments and the impact of prepayment expectations. Prepayment assumptions were developed through a review of BancShares’ historical prepayment activity and began with a review of prepayment assumptions utilized in other modeling activities. Estimates for loan losses are determined by analyzing quantitative and qualitative components present as of the evaluation date. Adjustments to the ACL are recorded with a corresponding entry to provision for credit losses. Loan balances considered uncollectible are charged-off against the ACL. Recoveries of amounts previously charged-off are credited to the ACL. A primary component of determining the ACL on loans is the actual net loss history of the various loan pools. For commercial pools, key factors utilized in the models include delinquency trends as well as macroeconomic variables such as unemployment and commercial real estate price index. For consumer pools, key factors include delinquency trends and the borrower’s original credit score, as well as other macroeconomic variables such as unemployment, gross domestic product, home price index, and commercial real estate index. As the models project losses over the life of the loans, prepayment assumptions also serve as inputs. Model outputs may be adjusted through a qualitative assessment to reflect economic conditions and trends not captured within the models including credit quality, concentrations, and significant policy and underwriting changes. Within our ACL model, TDRs meet the definition of default and are given a 100% probability of default rating. TDRs are not individually evaluated unless determined to be collateral-dependent. Therefore, loss given default is calculated based on the individual risk characteristics of the loan as defined in the model. When loans do not share risk characteristics similar to others in the pool, the ACL is evaluated on an individual basis. Given that BancShares' CECL models are loan level models, the population of loans evaluated individually is minimal and consists primarily of loans greater than $500 thousand and determined to be collateral-dependent. BancShares elected the practical expedient allowed under ASC 326 to assess the collectability of these loans, where repayment is expected to be provided substantially through operation or sale of collateral, based on the fair value of the underlying collateral. The fair value of the collateral is estimated using appraised and market values (appropriately adjusted for an assessment of the sales and marketing costs when applicable). A specific allowance is established, or partial charge-off is recorded, for the difference between the excess amortized cost of loan and the collateral’s estimated fair value. Accrued Interest Receivable BancShares has elected not to measure an ACL for accrued interest receivable and has excluded it from the amortized cost basis of loans and held to maturity debt securities as our accounting policies and credit monitoring provide that uncollectible accrued interest is reversed or written off against interest income in a timely manner. Unfunded Commitments A reserve for unfunded commitments is established for off-balance sheet exposures such as unfunded balances for existing lines of credit, commitments to extend future credit, as well as both standby and commercial letters of credit when there is a contractual obligation to extend credit and when this extension of credit is not unconditionally cancellable (i.e. commitment cannot be canceled at any time). These unfunded commitments are assessed to determine both the probability of funding as well the expectation of future losses. The expected funding balance is used in the probability of default and loss given default models to determine the reserve. The reserve for unfunded commitments was $12.8 million at December 31, 2020, and is recorded within other liabilities with changes recorded through other noninterest expense. Other Real Estate Owned Other Real Estate Owned (“OREO”) includes foreclosed real estate property and closed branch properties and is initially recorded at the asset’s estimated fair value less costs to sell. Any excess in the recorded investment in the loan over the estimated fair value less costs to sell is charged-off against the ACL at the time of foreclosure. If the estimated value of the OREO exceeds the recorded investment of the loan, the difference is recorded as a gain within other income. OREO is subsequently carried at the lower of cost or market value less estimated selling costs and is evaluated at least annually. The periodic evaluations are generally based on the appraised value of the property and may include additional adjustments based upon management’s review of the valuation estimate and specific knowledge of the property. Routine maintenance costs, income and expenses related to the operation of the foreclosed asset, subsequent declines in market value and net gains or losses on disposal are included in collection and foreclosure-related expense. Payable to the Federal Deposit Insurance Corporation for Shared-Loss Agreements The purchase and assumption agreements for certain Federal Deposit Insurance Corporation (“FDIC”) assisted transactions include payments that may be owed to the FDIC at the termination of the shared-loss agreements . The payment is due to the FDIC if actual cumulative losses on acquired covered assets are lower than the cumulative losses originally estimated by the FDIC at the time of acquisition. The liability is calculated by discounting estimated future payments and is reported as FDIC shared-loss payable. The ultimate settlement amount of the payment is dependent upon the performance of the underlying covered loans, recoveries, t

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Business Combinations	BUSINESS COMBINATIONS Recently Announced Business Combinations CIT Group Inc. On October 15, 2020, BancShares and CIT Group Inc., a Delaware corporation (“CIT”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and among BancShares, FCB, FC Merger Subsidiary IX, Inc., a direct, wholly owned subsidiary of FCB (“Merger Sub”), and CIT, the parent company of CIT Bank, N.A., a national banking association (“CIT Bank”). Pursuant to the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub will merge with and into CIT, with CIT as the surviving entity (the “First-Step Merger”), and as soon as reasonably practicable following the effective time of the First-Step Merger, CIT will merge with and into FCB, with FCB as the surviving entity (together with the First-Step Merger, the “Mergers”). The Merger Agreement further provides that immediately following the consummation of the Mergers, CIT Bank will merge with and into FCB, with FCB as the surviving bank (together with the Mergers, the “Transaction”). The Merger Agreement was unanimously approved by the Board of Directors of each of BancShares and CIT. On February 9, 2021, BancShares and CIT both held a special meeting of shareholders where they received the necessary shareholder approvals for the consummation of the Transaction from their respective shareholders. Subject to the fulfillment of customary closing conditions, the parties anticipate that the Transaction will close in the first half of 2021. Upon the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the First-Step Merger (the “Effective Time”), each share of CIT common stock, par value $0.01 per share, issued and outstanding immediately prior to the Effective Time (“CIT Common Stock”), except for certain shares of CIT Common Stock owned by CIT or BancShares, will be converted into the right to receive .06200 shares of BancShares Class A common stock, par value $1.00 per share. Holders of CIT Common Stock will receive cash in lieu of fractional shares. In addition, at the Effective Time, each share of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series A, par value $0.01 per share, of CIT and 5.625% Non-Cumulative Perpetual Preferred Stock, Series B, par value $0.01 per share, of CIT issued and outstanding will automatically be converted into the right to receive one share of a newly created series of preferred stock, Series B, of BancShares and one share of a newly created series of preferred stock, Series C, of BancShares, respectively. The Merger Agreement requires that, effective as of the Effective Time, the Boards of Directors of the combined company and the combined bank will consist of 14 directors, (i) 11 of whom will be members of the current Board of Directors of BancShares, and (ii) three of whom will be selected from among the current Board of Directors of CIT and will include as one of those three, Ellen R. Alemany, Chairwoman and Chief Executive Officer of CIT. Completed Business Combinations FCB has evaluated the financial statement significance for all business combinations completed during 2020 and 2019. FCB has concluded the completed business combinations noted below are not material to BancShares’ consolidated financial statements, individually or in aggregate, and therefore, pro forma financial data has not been included. Each transaction was accounted for under the acquisition method of accounting and, accordingly, assets acquired and liabilities assumed were recorded at their estimated fair values on the acquisition date. Fair values are preliminary and subject to refinement for up to one year after the closing date of the acquisition as additional information regarding closing date fair value becomes available. As part of the accounting for each acquisition, we perform an analysis of the acquired bank’s loan portfolio and based on such credit factors as past due status, nonaccrual status, life-to-date charge-offs and other quantitative and qualitative considerations segregate the acquired loans into PCD loans and non-PCD loans. PCD loans are accounted for under ASC 326, and non-PCD loans which do not meet this criteria are accounted for under ASC 310. Additionally, we perform an analysis of the acquired bank’s portfolio of debt securities to determine if any debt securities should be designated PCD. Community Financial Holding Company, Inc. On February 1, 2020, FCB completed the merger of Duluth, Georgia-based Community Financial Holding Company, Inc. (“Community Financial”) and its bank subsidiary, Gwinnett Community Bank. Under the terms of the agreement, total cash consideration of $2.3 million was paid to the shareholders of Community Financial. The merger allows FCB to expand its presence and enhance banking efforts in Georgia. The fair value of the assets acquired was $221.4 million, including $110.6 million in non-PCD loans, $23.4 million in PCD loans, net of an ACL of $1.2 million, and $536 thousand in a core deposit intangible. No debt securities purchased in the transaction were designated PCD. Liabilities assumed were $219.8 million, of which $209.3 million were deposits. As a result of the transaction, FCB recorded $686 thousand of goodwill. The amount of goodwill represents the excess purchase price over the estimated fair value of the net assets acquired. The premium paid reflects the increased market share and related synergies expected to result from the acquisition. None of the goodwill was deductible for income tax purposes as the merger was accounted for as a qualified stock purchase. The following table provides the purchase price as of the acquisition date and the identifiable assets acquired and liabilities assumed at their estimated fair values: (Dollars in thousands) As recorded by FCB Purchase price $ 2,320 Assets Cash and due from banks $ 1,085 Overnight investments 35,129 Investment securities 30,146 Loans 133,989 Premises and equipment 7,624 Other real estate owned 9,813 Income earned not collected 558 Intangible assets 536 Other assets 2,520 Total assets acquired 221,400 Liabilities Deposits 209,340 Borrowings 9,925 Other liabilities 501 Total liabilities assumed $ 219,766 Fair value of net assets acquired 1,634 Goodwill recorded for Community Financial $ 686 The Community Financial transaction resulted in merger-related expenses of $3.5 million for the year ended December 31, 2020. Additionally, loan-related interest income generated was approximately $5.3 million since the acquisition date. The ongoing contribution of this transaction to BancShares’ financial statements is not considered material, and therefore pro forma financial data is not included. Entegra Financial Corp. On December 31, 2019, FCB completed the merger of Franklin, North Carolina-based Entegra Financial Corp. (“Entegra”) and its bank subsidiary, Entegra Bank. Fair values were subject to refinement for up to one year after the closing date of the acquisition. The measurement period ended on December 30, 2020. The fair value of the assets acquired was $1.68 billion, including $953.7 million in non-PCI loans, $77.5 million in PCI loans and $4.5 million in a core deposit intangible. Liabilities assumed were $1.51 billion, of which $1.33 billion were deposits. As a result of the transaction, FCB recorded $52.6 million of goodwill. The amount of goodwill represents the excess purchase price over the estimated fair value of the net assets acquired. Subsequent to the merger, management made a measurement period adjustment of $214 thousand related to an increase in the discount for PCD loans, an increase in the premium on deposits divested and adjustments to the deferred tax asset for these items. In order to obtain regulatory approval, FCB entered into an agreement for Select Bank & Trust Company (“Select Bank”) to purchase three North Carolina branches, located in Highlands, Sylva and Franklin. On April 17, 2020, FCB completed the divestiture of the branches including loans and leases, premises and equipment and total deposits with fair values of $110.1 million, $2.1 million and $184.8 million, respectively. The Select Bank purchase price for the divested branches included an 8% premium for deposits acquired that was applied against goodwill generated as part of the merger with Entegra Bank. The Entegra transaction resulted in merger-related expenses of $7.8 million and $5.4 million or the years ended December 31, 2020 and 2019, respectively. Additionally, loan-related interest was $40.3 million for the year ended December 31, 2020, while no loan-related interest income was recorded for the year ended December 31, 2019. First South Bancorp, Inc. On May 1, 2019, FCB completed the merger of Spartanburg, South Carolina-based First South Bancorp, Inc. (“First South Bancorp”) and its bank subsidiary, First South Bank. Fair values were subject to refinement for up to one year after the closing date of the acquisition. The measurement period ended on April 30, 2020, with no material changes to the original calculated fair values. The fair value of the assets acquired was $239.2 million, including $162.8 million in non-PCI loans, $16.4 million in PCI loans and $2.3 million in a core deposit intangible. Liabilities assumed were $215.6 million, of which $207.6 million were deposits. As a result of the transaction, FCB recorded $13.9 million of goodwill. The amount of goodwill represents the excess purchase price over the estimated fair value of the net assets acquired. The First South Bancorp transaction resulted in no merger-related expenses for the year ended December 31, 2020 and $4.1 million for the year ended December 31, 2019. Additionally, loan-related interest income was approximately $5.7 million and $6.1 million for the years ended December 31, 2020 and 2019, respectively. Biscayne Bancshares, Inc. On April 2, 2019, FCB completed the merger of Coconut Grove, Florida-based Biscayne Bancshares, Inc. (“Biscayne Bancshares”) and its bank subsidiary, Biscayne Bank. Fair values were subject to refinement for up to one year after the closing date of the acquisition. The measurement period ended on April 1, 2020, with no material changes to the original calculated fair values. The fair value of the assets acquired was $1.03 billion, including $850.4 million in non-PCI loans, $13.0 million in PCI loans and $4.7 million in a core deposit intangible. Liabilities assumed were $956.8 million, of which $786.5 million were deposits. As a result of the transaction, FCB recorded $46.5 million of goodwill. The amount of goodwill represents the excess purchase price over the estimated fair value of the net assets acquired. The Biscayne Bancshares transaction resulted in merger-related expenses of $847 thousand and $5.8 million the years ended December 31, 2020 and 2019, respectively. Additionally, loan-related interest income generated approximately $37.8 million and $33.8 million for the years ended December 31, 2020 and 2019, respectively.

Investments

Investments	12 Months Ended
	Dec. 31, 2020
Investments [Abstract]
Investments	INVESTMENTS The amortized cost and fair value of investment and marketable equity securities at December 31, 2020 and 2019, were as follows: December 31, 2020 (Dollars in thousands) Cost Gross Gross unrealized Allowance for credit losses Fair Investment securities available for sale U.S. Treasury $ 499,832 $ 101 $ — $ — $ 499,933 Government agency 706,241 723 5,573 — 701,391 Residential mortgage-backed securities 4,369,130 70,283 1,310 — 4,438,103 Commercial mortgage-backed securities 745,892 25,645 — — 771,537 Corporate bonds 590,870 14,437 2,028 — 603,279 Total investment securities available for sale $ 6,911,965 $ 111,189 $ 8,911 $ — $ 7,014,243 Investment in marketable equity securities 84,837 8,654 1,811 91,680 Investment securities held to maturity Residential mortgage-backed securities 1,877,692 17,689 — — 1,895,381 Commercial mortgage-backed securities 937,034 3,884 56 — 940,862 Other 2,256 — — — 2,256 Total investment securities held to maturity 2,816,982 21,573 56 — 2,838,499 Total investment securities $ 9,813,784 $ 141,416 $ 10,778 $ — $ 9,944,422 December 31, 2019 Cost Gross Gross unrealized Fair Investment securities available for sale U.S. Treasury $ 409,397 $ 602 $ — $ 409,999 Government agency 684,085 928 2,241 682,772 Residential mortgage-backed securities 5,269,060 13,417 15,387 5,267,090 Commercial mortgage-backed securities 373,105 6,974 59 380,020 Corporate bonds 198,278 3,420 132 201,566 State, county and municipal 118,227 — — 118,227 Total investment securities available for sale $ 7,052,152 $ 25,341 $ 17,819 $ 7,059,674 Investment in marketable equity securities 59,262 23,304 233 82,333 Investment securities held to maturity Other 30,996 — — 30,996 Total investment securities $ 7,142,410 $ 48,645 $ 18,052 $ 7,173,003 On November 1, 2020, mortgage-backed securities with an amortized cost of $1.46 billion were transferred from investment securities available for sale to the held to maturity portfolio. At the time of transfer, the mortgage-backed securities had a fair value of $1.47 billion and a weighted average contractual maturity of 18 years. The unrealized gain on these securities at the date of transfer was $5.9 million, or $4.5 million net of tax, and was reported as a component of AOCI. This unrealized gain is accreted over the remaining expected life of the securities as an adjustment of yield. On November 1, 2019, as part of the adoption of ASU 2019-04, mortgage-backed securities with an amortized cost of $2.08 billion were transferred from investment securities held to maturity to the available for sale portfolio. At the time of the transfer, the securities had a fair value of $2.15 billion. The transfer resulted in a reclassification of unrealized losses of $72.5 million, or $55.8 million net of tax, previously frozen in AOCI as a result of the initial transfer to held to maturity. FCB still has the intent and ability to hold the remainder of the held to maturity portfolio to maturity. Investments in mortgage-backed securities represent securities issued by the Government National Mortgage Association, Federal National Mortgage Association and Federal Home Loan Mortgage Corporation. Investments in government agency securities represent securities issued by the SBA. Investments in corporate bonds and marketable equity securities represent positions in securities of other financial institutions. Other held to maturity investments include certificates of deposit with other financial institutions. As of December 31, 2020 and January 1, 2020, no ACL was required for available for sale and held to maturity debt securities. At December 31, 2020, accrued interest receivable for available for sale and held to maturity debt securities were $17.6 million and $5.4 million, respectively, and were excluded from the estimate of credit losses. During the year ended December 31, 2020, no accrued interest was deemed uncollectible and written off against interest income. The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Residential and commercial mortgage-backed and government agency securities are stated separately as they are not due at a single maturity date. December 31, 2020 December 31, 2019 (Dollars in thousands) Cost Fair Cost Fair Investment securities available for sale Non-amortizing securities maturing in: One year or less $ 500,846 $ 500,954 $ 406,325 $ 406,927 One through five years 72,565 73,881 24,496 24,971 Five through 10 years 508,320 519,570 185,209 187,868 Over 10 years 8,971 8,807 109,872 110,026 Government agency 706,241 701,391 684,085 682,772 Residential mortgage-backed securities 4,369,130 4,438,103 5,269,060 5,267,090 Commercial mortgage-backed securities 745,892 771,537 373,105 380,020 Total investment securities available for sale $ 6,911,965 $ 7,014,243 $ 7,052,152 $ 7,059,674 Investment securities held to maturity Non-amortizing securities maturing in: One year or less $ 1,507 $ 1,507 $ 30,746 $ 30,746 One through five years 749 749 250 250 Residential mortgage-backed securities 1,877,692 1,895,381 — — Commercial mortgage-backed securities 937,034 940,862 — — Total investment securities held to maturity $ 2,816,982 $ 2,838,499 $ 30,996 $ 30,996 For each period presented, realized gains on investment securities available for sale included the following: Year ended December 31 (Dollars in thousands) 2020 2019 2018 Gross gains on retirement/sales of investment securities available for sale $ 60,932 $ 8,993 $ 353 Gross losses on sales of investment securities available for sale (679) (1,878) (2) Realized gains on investment securities available for sale, net $ 60,253 $ 7,115 $ 351 For each period presented, realized and unrealized gains or losses on marketable equity securities included the following: Year ended December 31 (Dollars in thousands) 2020 2019 2018 Marketable equity securities gains (losses), net $ 29,395 $ 20,625 $ (7,610) Less net gains recognized on marketable equity securities sold 44,550 16,344 1,190 Unrealized (losses) gains recognized on marketable equity securities held $ (15,155) $ 4,281 $ (8,800) The following table provides information regarding investment securities with unrealized losses as of December 31, 2020 and 2019: December 31, 2020 Less than 12 months 12 months or more Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Investment securities available for sale Government agency $ 268,622 $ 3,197 $ 328,777 $ 2,376 $ 597,399 $ 5,573 Residential mortgage-backed securities 433,816 1,241 23,064 69 456,880 1,310 Corporate bonds 57,715 2,028 — — 57,715 2,028 Total $ 760,153 $ 6,466 $ 351,841 $ 2,445 $ 1,111,994 $ 8,911 December 31, 2019 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Investment securities available for sale Government agency $ 347,081 $ 1,827 $ 63,947 $ 414 $ 411,028 $ 2,241 Residential mortgage-backed securities 2,387,293 14,016 264,257 1,371 2,651,550 15,387 Commercial mortgage-backed securities 35,926 59 — — 35,926 59 Corporate bonds 7,714 123 4,749 9 12,463 132 Total $ 2,778,014 $ 16,025 $ 332,953 $ 1,794 $ 3,110,967 $ 17,819 As of December 31, 2020, there were 39 investment securities available for sale with continuous losses for more than 12 months, all of which are government sponsored, enterprise-issued mortgage-backed securities or government agency securities. None of the unrealized losses identified as of December 31, 2020 or December 31, 2019 relate to the issuer’s ability to honor redemption obligations. Rather, the unrealized losses relate to changes in interest rates relative to when the investment securities were purchased, and do not indicate credit-related impairment. BancShares considered other factors including changes in credit ratings, delinquencies, and other macroeconomic factors in this determination. As a result, none of the securities were deemed to require an allowance for credit losses. BancShares has the ability and intent to retain these securities for a period of time sufficient to recover all unrealized losses. Investment securities having an aggregate carrying value of $4.64 billion at December 31, 2020 and $3.93 billion at December 31, 2019, were pledged as collateral to secure public funds on deposit and certain short-term borrowings, and for other purposes as required by law. BancShares’ portfolio of held to maturity debt securities consists of mortgage-backed securities issued by government agencies and government sponsored entities. Given the consistently strong credit rating of the U.S. Treasury and the long history of no credit losses on debt securities issued by government agencies and government sponsored entities, no allowance for credit losses has been recorded on these securities. Should there be downgrades to the credit rating of the U.S. Treasury or losses reported on securities issued by government agencies and government sponsored entities, BancShares will reevaluate its determination of zero expected credit losses on held to maturity debt securities. There were no debt securities held to maturity on nonaccrual status as of December 31, 2020. A security is considered past due once it is 30 days contractually past due under the terms of the agreement. There were no securities past due as of December 31, 2020.

Loans and Leases

Loans and Leases	12 Months Ended
	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Abstract]
Loans and Leases	LOANS AND LEASES BancShares’ accounting methods for loans and leases depends whether they are originated or purchased, and if purchased, whether or not the loans reflect more than insignificant credit deterioration since origination, which is determined as of the acquisition date. Non-PCD loans consist of loans originated by BancShares and loans purchased from other institutions that do not reflect more than insignificant credit deterioration at acquisition and are reported by loan segments as defined in Note A, Accounting Policies and Basis of Presentation. Purchased loans which reflect more than insignificant credit deterioration are classified as PCD and reported as a single loan segment or class. At the date of acquisition, all acquired loans are recorded at fair value. Loans and leases outstanding include the following at December 31, 2020 and 2019: (Dollars in thousands) December 31, 2020 Commercial: Construction and land development $ 985,424 Owner occupied commercial mortgage 11,165,012 Non-owner occupied commercial mortgage 2,987,689 Commercial and industrial and leases 5,013,644 SBA-PPP 2,406,291 Total commercial loans 22,558,060 Consumer: Residential mortgage 5,561,686 Revolving mortgage 2,052,854 Construction and land development 348,123 Consumer auto 1,255,402 Consumer other 552,968 Total consumer loans 9,771,033 Total non-PCD loans and leases 32,329,093 PCD loans 462,882 Total loans and leases $ 32,791,975 (Dollars in thousands) December 31, 2019 Commercial: Construction and land development $ 1,013,454 Commercial mortgage 12,282,635 Other commercial real estate 542,028 Commercial and industrial and leases 4,403,792 Other 310,093 Total commercial loans 18,552,002 Noncommercial: Residential mortgage 5,293,917 Revolving mortgage 2,339,072 Construction and land development 357,385 Consumer 1,780,404 Total noncommercial loans 9,770,778 Total non-PCI loans and leases 28,322,780 PCI loans 558,716 Total loans and leases $ 28,881,496 Certain residential real estate loans are originated to be sold to investors and are recorded in loans held for sale at fair value. Loans held for sale totaled $124.8 million and $67.9 million at December 31, 2020 and 2019, respectively. We may change our strategy for certain portfolio loans and sell them in the secondary market. At such time, portfolio loans are transferred to loans held for sale at fair value. During 2020, total proceeds from sales of residential mortgage loans were $1.05 billion, the majority of which were originated to be sold. An additional $7.6 million related to sales of portfolio loans, which were sold at par. During 2019, total proceeds from sales of residential mortgage loans were $756.0 million, of which $731.8 million related to sales of loans held for sale. The remaining $24.2 million related to sales of portfolio loans, which resulted in a gain of $0.3 million. Net deferred fees on originated non-PCD loans and leases, including unearned income as well as unamortized costs, were $50.2 million and $0.9 million at December 31, 2020 and 2019, respectively. Of the amount outstanding as of December 31, 2020, $41.1 million relates to net deferred fees and costs on SBA-PPP loans. The unamortized discounts related to purchased non-PCD loans was $19.5 million at December 31, 2020 and $30.9 million at December 31, 2019. The net unamortized discount related to PCD loans and leases was $45.3 million at December 31, 2020 and $88.2 million at December 31, 2019. Loans and leases to borrowers in medical, dental or related fields were $5.54 billion as of December 31, 2020, which represented 16.9% of total loans and leases, compared to $5.16 billion or 17.9% of total loans and leases at December 31, 2019. The credit risk of this industry concentration is mitigated through our underwriting policies, which emphasize reliance on adequate borrower cash flow, rather than underlying collateral value, and our preference for financing secured by owner-occupied real property. Except for this single concentration, no other industry represented more than 10% of total loans and leases outstanding at December 31, 2020. The aging of the outstanding loans and leases, by class, at December 31, 2020 and December 31, 2019 is provided in the tables below. Loans and leases 30 days or less past due are considered current, as various grace periods allow borrowers to make payments within a stated period after the due date and still remain in compliance with the loan agreement. December 31, 2020 (Dollars in thousands) 30-59 days 60-89 days 90 days or greater Total past Current Total loans Commercial: Construction and land development $ 956 $ 527 $ 1,603 $ 3,086 $ 982,338 $ 985,424 Owner occupied commercial mortgage 8,757 2,232 14,082 25,071 11,139,941 11,165,012 Non-owner occupied commercial mortgage 12,370 — 5,973 18,343 2,969,346 2,987,689 Commercial and industrial and leases 14,532 2,842 3,243 20,617 4,993,027 5,013,644 SBA-PPP — — — — 2,406,291 2,406,291 Total commercial loans 36,615 5,601 24,901 67,117 22,490,943 22,558,060 Consumer: Residential mortgage 43,218 8,364 31,690 83,272 5,478,414 5,561,686 Revolving mortgage 11,977 2,626 7,415 22,018 2,030,836 2,052,854 Construction and land development 932 77 330 1,339 346,784 348,123 Consumer auto 6,825 1,835 1,076 9,736 1,245,666 1,255,402 Consumer other 3,610 1,464 1,505 6,579 546,389 552,968 Total consumer loans 66,562 14,366 42,016 122,944 9,648,089 9,771,033 PCD loans 18,322 6,076 31,026 55,424 407,458 462,882 Total loans and leases $ 121,499 $ 26,043 $ 97,943 $ 245,485 $ 32,546,490 $ 32,791,975 December 31, 2019 (Dollars in thousands) 30-59 days 60-89 days 90 days or greater Total past Current Total loans Commercial: Construction and land development $ 3,146 $ 195 $ 2,702 $ 6,043 $ 1,007,411 $ 1,013,454 Commercial mortgage 20,389 8,774 8,319 37,482 12,245,153 12,282,635 Other commercial real estate 861 331 698 1,890 540,138 542,028 Commercial and industrial and leases 18,269 4,842 5,032 28,143 4,375,649 4,403,792 Other 51 411 126 588 309,505 310,093 Total commercial loans 42,716 14,553 16,877 74,146 18,477,856 18,552,002 Noncommercial: Residential mortgage 45,839 18,289 24,409 88,537 5,205,380 5,293,917 Revolving mortgage 9,729 3,468 9,865 23,062 2,316,010 2,339,072 Construction and land development 977 218 1,797 2,992 354,393 357,385 Consumer 10,481 3,746 3,571 17,798 1,762,606 1,780,404 Total noncommercial loans 67,026 25,721 39,642 132,389 9,638,389 9,770,778 PCI loans 26,478 10,784 28,973 66,235 492,481 558,716 Total loans and leases $ 136,220 $ 51,058 $ 85,492 $ 272,770 $ 28,608,726 $ 28,881,496 The amortized cost, by class, of loans and leases on nonaccrual status, and loans and leases greater than 90 days past due and still accruing at December 31, 2020 and December 31, 2019, were as follows: January 1, 2020 (1) December 31, 2020 (Dollars in thousands) Nonaccrual Nonaccrual Loans and Commercial: Construction and land development $ 4,281 $ 1,661 $ — Owner occupied commercial mortgage 24,476 23,103 3,625 Non-owner occupied commercial mortgage 5,965 7,932 147 Commercial and industrial and leases 7,685 10,626 540 Total commercial loans 42,407 43,322 4,312 Consumer: Residential mortgage 44,357 66,345 — Revolving mortgage 22,411 22,236 — Construction and land development 2,828 652 — Consumer auto 2,145 3,166 — Consumer other 798 823 1,195 Total consumer loans 72,539 93,222 1,195 PCD loans 53,771 54,939 355 Total loans and leases $ 168,717 $ 191,483 $ 5,862 (1) Upon the adoption of ASC 326, BancShares eliminated the pooling of PCI loans and as a result $47.0 million in additional PCD loans were recognized as nonaccrual loans at January 1, 2020. As of December 31, 2020, $24.9 million of these loans remained outstanding. December 31, 2019 (Dollars in thousands) Nonaccrual Loans and Commercial: Construction and land development $ 4,281 $ — Commercial mortgage 29,733 — Commercial and industrial and leases 7,365 1,094 Other commercial real estate 708 — Other 320 — Total commercial loans 42,407 1,094 Consumer: Construction and land development 2,828 — Residential mortgage 44,357 45 Revolving mortgage 22,411 — Consumer 2,943 2,152 Total noncommercial loans 72,539 2,197 Total non-PCI loans and leases $ 114,946 $ 3,291 Credit quality indicators Loans and leases are monitored for credit quality on a recurring basis. Commercial and noncommercial loans and leases have different credit quality indicators as a result of the unique characteristics of the loan segments being evaluated. The credit quality indicators for non-PCD commercial loans and leases are developed through a review of individual borrowers on an ongoing basis. Commercial loans are evaluated periodically with more frequent evaluations done on criticized loans. The indicators as of the date presented are based on the most recent assessment performed and are defined below: Pass – A pass rated asset is not adversely classified because it does not display any of the characteristics for adverse classification. Special mention – A special mention asset has potential weaknesses which deserve management’s close attention. If left uncorrected, such potential weaknesses may result in deterioration of the repayment prospects or collateral position at some future date. Special mention assets are not adversely classified and do not warrant adverse classification. Substandard – A substandard asset is inadequately protected by the current net worth and paying capacity of the borrower or of the collateral pledged, if any. Assets classified as substandard generally have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt. These assets are characterized by the distinct possibility of loss if the deficiencies are not corrected. Doubtful – An asset classified as doubtful has all the weaknesses inherent in an asset classified substandard with the added characteristic that the weaknesses make collection or liquidation in full highly questionable and improbable on the basis of currently existing facts, conditions and values. Loss – Assets classified as loss are considered uncollectible and of such little value it is inappropriate to be carried as an asset. This classification is not necessarily equivalent to any potential for recovery or salvage value, but rather it is not appropriate to defer a full charge-off even though partial recovery may be affected in the future. Ungraded – Ungraded loans represent loans not included in the individual credit grading process due to their relatively small balances or borrower type. The majority of ungraded loans at December 31, 2020 and 2019, relate to business credit cards. Business credit card loans are subject to automatic charge-off when they become 120 days past due in the same manner as unsecured consumer lines of credit. The remaining balance is comprised of a small amount of commercial mortgage, lease financing and other commercial real estate loans. The credit quality indicators for consumer and PCD loans are based on delinquency status of the borrower as of the date presented. As the borrower becomes more delinquent, the likelihood of loss increases. The following tables represent current credit quality indicators by origination year as of December 31, 2020. Commercial Loans Amortized Cost Basis by Origination Year Classification: 2020 2019 2018 2017 2016 Prior Revolving Revolving converted to term loans Total (Dollars in thousands) Construction and land development Pass $ 342,183 $ 341,233 $ 190,429 $ 50,776 $ 23,969 $ 11,306 $ 10,969 $ — $ 970,865 Special Mention 246 — 6,421 5,342 — — 153 — 12,162 Substandard 229 629 1,450 — 8 81 — — 2,397 Total 342,658 341,862 198,300 56,118 23,977 11,387 11,122 — 985,424 Owner occupied commercial mortgage Pass 3,183,467 2,201,165 1,625,141 1,301,412 1,049,858 1,454,020 101,556 133 10,916,752 Special Mention 6,274 20,702 36,739 12,387 17,699 25,693 5,115 72 124,681 Substandard 10,280 19,052 9,842 20,928 13,736 41,303 8,438 — 123,579 Total 3,200,021 2,240,919 1,671,722 1,334,727 1,081,293 1,521,016 115,109 205 11,165,012 Non-owner occupied commercial mortgage Pass 865,514 609,975 378,136 331,800 282,810 391,517 32,149 — 2,891,901 Special Mention 569 905 10,794 1,808 5,121 3,279 483 — 22,959 Substandard 2,899 18,546 12,296 8,764 14,087 15,427 810 — 72,829 Total 868,982 629,426 401,226 342,372 302,018 410,223 33,442 — 2,987,689 Commercial and industrial and leases Pass 1,620,622 983,852 504,463 310,468 234,735 286,996 899,978 5,520 4,846,634 Special Mention 3,146 17,065 7,265 5,393 3,307 4,912 9,152 189 50,429 Substandard 17,811 4,095 4,370 4,257 2,548 3,801 22,384 983 60,249 Ungraded — — — — — — 56,332 — 56,332 Total 1,641,579 1,005,012 516,098 320,118 240,590 295,709 987,846 6,692 5,013,644 SBA-PPP Pass 2,406,291 — — — — — — — 2,406,291 Total commercial $ 8,459,531 $ 4,217,219 $ 2,787,346 $ 2,053,335 $ 1,647,878 $ 2,238,335 $ 1,147,519 $ 6,897 $ 22,558,060 Consumer and PCD Loans Amortized Cost Basis by Origination Year Days Past Due: 2020 2019 2018 2017 2016 Prior Revolving Revolving converted to term loans Total (Dollars in thousands) Residential mortgage Current $ 1,882,683 $ 978,298 $ 655,798 $ 596,309 $ 461,719 $ 878,634 $ 24,973 $ — $ 5,478,414 30-59 days 2,278 4,573 11,463 3,772 8,613 12,299 220 — 43,218 60-89 days 30 100 1,246 1,449 834 4,705 — — 8,364 90 days or greater 282 4,831 3,150 4,015 5,689 13,723 — — 31,690 Total 1,885,273 987,802 671,657 605,545 476,855 909,361 25,193 — 5,561,686 Revolving mortgage Current — — — — — — 1,879,968 150,868 2,030,836 30-59 days — — — — — — 8,241 3,736 11,977 60-89 days — — — — — — 527 2,099 2,626 90 days or greater — — — — — — 2,301 5,114 7,415 Total — — — — — — 1,891,037 161,817 2,052,854 Construction and land development Current 215,112 85,707 24,860 10,269 6,093 2,218 2,525 — 346,784 30-59 days — 420 121 370 — 21 — — 932 60-89 days — — — 9 — 68 — — 77 90 days or greater — — — — — 330 — — 330 Total 215,112 86,127 24,981 10,648 6,093 2,637 2,525 — 348,123 Consumer auto Current 521,719 340,594 219,597 104,280 49,872 9,604 — — 1,245,666 30-59 days 2,175 1,873 1,257 842 544 134 — — 6,825 60-89 days 329 689 312 351 109 45 — — 1,835 90 days or greater 170 527 217 57 102 3 — — 1,076 Total 524,393 343,683 221,383 105,530 50,627 9,786 — — 1,255,402 Consumer other Current 53,842 27,117 10,911 7,159 2,980 29,336 415,044 — 546,389 30-59 days 322 114 77 18 11 7 3,061 — 3,610 60-89 days 102 20 13 18 3 23 1,285 — 1,464 90 days or greater 53 84 8 — — — 1,360 — 1,505 Total 54,319 27,335 11,009 7,195 2,994 29,366 420,750 — 552,968 Total consumer 2,679,097 1,444,947 929,030 728,918 536,569 951,150 2,339,505 161,817 9,771,033 PCD loans Current 31,475 25,425 27,183 27,955 28,995 232,186 13,212 21,027 407,458 30-59 days 999 925 801 718 1,341 12,637 156 745 18,322 60-89 days 447 81 312 695 97 4,098 9 337 6,076 90 days or greater 721 2,325 4,755 1,208 897 19,963 111 1,046 31,026 Total PCD 33,642 28,756 33,051 30,576 31,330 268,884 13,488 23,155 462,882 Total loans and leases $ 11,172,270 $ 5,690,922 $ 3,749,427 $ 2,812,829 $ 2,215,777 $ 3,458,369 $ 3,500,512 $ 191,869 $ 32,791,975 Loans and leases outstanding at December 31, 2019 by credit quality indicator are provided below: December 31, 2019 Commercial loans and leases (Dollars in thousands) Construction and land Commercial mortgage Other commercial real estate Commercial and industrial and leases Other PCI Total commercial loans and leases Grade: Pass $ 1,004,922 $ 12,050,799 $ 536,682 $ 4,256,456 $ 308,796 $ 148,412 $ 18,306,067 Special mention 2,577 115,164 3,899 44,604 622 44,290 211,156 Substandard 5,955 116,672 1,447 34,148 675 87,970 246,867 Doubtful — — — 3 — 3,657 3,660 Ungraded — — — 68,581 — — 68,581 Total $ 1,013,454 $ 12,282,635 $ 542,028 $ 4,403,792 $ 310,093 $ 284,329 $ 18,836,331 December 31, 2019 Noncommercial loans and leases (Dollars in thousands) Residential mortgage Revolving mortgage Construction and land development Consumer PCI Total noncommercial loans and leases Days past due: Current $ 5,205,380 $ 2,316,010 $ 354,393 $ 1,762,606 $ 240,995 $ 9,879,384 30-59 days past due 45,839 9,729 977 10,481 13,764 80,790 60-89 days past due 18,289 3,468 218 3,746 5,608 31,329 90 days or greater past due 24,409 9,865 1,797 3,571 14,020 53,662 Total $ 5,293,917 $ 2,339,072 $ 357,385 $ 1,780,404 $ 274,387 $ 10,045,165 The following table provides information regarding loans pledged as collateral for borrowing capacity through the FHLB of Atlanta and the Federal Reserve Bank (“FRB”) as of December 31, 2020 and 2019: (Dollars in thousands) December 31, 2020 December 31, 2019 FHLB of Atlanta Lendable collateral value of pledged non-PCD loans $ 8,637,844 $ 6,574,636 Less: advances 652,675 563,690 Available borrowing capacity $ 7,985,169 $ 6,010,946 Pledged non-PCD loans $ 12,157,153 $ 9,407,688 FRB Lendable collateral value of pledged non-PCD loans $ 3,321,762 $ 2,981,712 Less: advances — — Available borrowing capacity $ 3,321,762 $ 2,981,712 Pledged non-PCD loans $ 4,104,866 $ 3,684,919 Purchased loans and leases The following table summarizes PCD loans acquired in the Community Financial transaction and provides the contractually required payments, less the initial allowance for credit losses and discount to produce the fair value of acquired loans with evidence of more than insignificant credit quality deterioration since origination at the acquisition date: (Dollars in thousands) Community Financial Contractually required payments $ 25,635 Initial PCD allowance 1,193 Discount 1,055 Fair value at acquisition date $ 23,387 The recorded fair values of purchased non-PCD loans acquired in the Community Financial transaction as of the acquisition date are as follows: (Dollars in thousands) Community Financial Commercial: Construction and land development $ 9,428 Owner occupied commercial mortgage 31,473 Non-owner occupied commercial mortgage 25,143 Commercial and industrial and leases 15,065 Total commercial loans 81,109 Consumer: Residential mortgage 21,168 Revolving mortgage 2,084 Construction and land development 5,254 Consumer auto 294 Consumer other 693 Total consumer loans 29,493 Total non-PCD loans $ 110,602

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Allowance for Credit Losses	ALLOWANCE FOR CREDIT LOSSES As noted in Note A, Accounting Polices and Basis of Presentation, BancShares determined SBA-PPP loans have zero expected credit losses and as such these are excluded from ACL disclosures included in the following tables. Upon adoption of ASC 326, BancShares recorded a net decrease of $37.9 million in the ACL which included a decrease of $56.9 million in the ACL on non-PCD loans, offset by an increase of $19.0 million in the ACL on PCD loans. The largest changes as a result of adoption were decreases in the ACL on commercial loan segments as these portfolios have exhibited strong historical credit performance and have relatively short average lives. The reduction in ACL on these segments was partially offset by increases in ACL on our consumer loan segments primarily due to their longer average lives. The increase in the ACL on PCD loans was primarily the result of reallocating credit discount from loan balances into ACL. The ACL is calculated using a variety of factors, including, but not limited to, charge-off and recovery activity, loan growth, changes in macroeconomic factors, collateral type, estimated loan life and changes in credit quality. For the period ended December 31, 2020 the primary reason for the ACL change since the adoption of ASC 326, was a $36.1 million reserve build due to the potential economic impact of COVID-19 and its estimated impact on credit losses. Forecasted economic conditions are developed using third party macroeconomic scenarios adjusted based on management’s expectations over a forecast period of two years. Assumptions revert to long term historic averages over a one year period. Significant macroeconomic factors used in estimating the expected losses include unemployment, gross domestic product, home price index and commercial real estate index. Our model results consider baseline, adverse and upside scenarios. To calculate the ACL, we utilized the baseline scenario, which considers government stimulus and incorporates significant improvements to the most significant forecast assumptions when compared on the COVID-19-impacted levels from early in 2020. This result was calibrated using management’s expectation of borrower performance based upon COVID-19 residual risk by industry. These loss estimates were also influenced by BancShares strong credit quality, low net charge-offs and recent credit trends, which remained stable through the latter half of year ended December 31, 2020, despite potential impacts from COVID-19. Activity in the allowance for credit losses by class of loans is summarized as follows: Year ended December 31, 2020 (Dollars in thousands) Construction and land development - commercial Owner occupied commercial mortgage Non-owner occupied commercial mortgage Commercial and industrial and leases Residential mortgage Revolving mortgage Construction and land development - consumer Consumer auto Consumer other PCD Total Allowance for credit losses: Balance at December 31, 2019 $ 33,213 $ 36,444 $ 11,102 $ 61,610 $ 18,232 $ 19,702 $ 2,709 $ 4,292 $ 30,301 $ 7,536 $ 225,141 Adoption of ASC 326 (31,061) (19,316) 460 (37,637) 17,118 3,665 (1,291) 1,100 10,037 19,001 (37,924) Balance at January 1, 2020 2,152 17,128 11,562 23,973 35,350 23,367 1,418 5,392 40,338 26,537 187,217 Provision (credits) 4,301 6,729 12,917 13,816 9,684 1,134 266 6,297 10,410 (7,202) 58,352 Initial allowance on PCD loans — — — — — — — — — 1,193 1,193 Charge-offs (138) (593) (1,951) (14,904) (1,653) (1,662) (70) (3,646) (17,188) (3,300) (45,105) Recoveries 431 401 124 4,894 717 1,918 117 1,417 5,879 6,759 22,657 Balance at December 31, 2020 $ 6,746 $ 23,665 $ 22,652 $ 27,779 $ 44,098 $ 24,757 $ 1,731 $ 9,460 $ 39,439 $ 23,987 $ 224,314 Years ended December 31, 2019 and 2018 (Dollars in thousands) Construction Commercial Other Commercial Other Residential Revolving Construction Consumer PCI Total Allowance for credit losses: Balance at January 1, 2018 $ 24,470 $ 45,005 $ 4,571 $ 59,824 $ 4,689 $ 15,706 $ 22,436 $ 3,962 $ 31,204 $ 10,026 $ 221,893 Provision (credits) 10,533 (1,490) (2,171) 2,511 (2,827) 897 1,112 (1,520) 22,187 (765) 28,467 Charge-offs (44) (1,140) (69) (10,211) (130) (1,689) (3,235) (219) (22,817) (117) (39,671) Recoveries 311 1,076 150 3,496 489 558 1,549 127 5,267 — 13,023 Balance at December 31, 2018 35,270 43,451 2,481 55,620 2,221 15,472 21,862 2,350 35,841 9,144 223,712 Provision (credits) (2,171) 2,384 (285) 14,212 (754) 3,481 (788) 359 16,611 (1,608) 31,441 Charge-offs (196) (1,096) — (13,352) (100) (1,137) (2,584) — (24,562) — (43,027) Recoveries 310 596 15 2,894 869 416 1,212 — 6,703 — 13,015 Balance at December 31, 2019 $ 33,213 $ 45,335 $ 2,211 $ 59,374 $ 2,236 $ 18,232 $ 19,702 $ 2,709 $ 34,593 $ 7,536 $ 225,141 BancShares records an allowance for credit losses on unfunded commitments within other liabilities. Activity in the allowance for credit losses for unfunded commitments is summarized as follows: (Dollars in thousands) Year ended December 31, 2020 Allowance for credit losses: Balance at December 31, 2019 $ 1,055 Adoption of ASC 326 8,885 Balance at January 1, 2020 $ 9,940 Provision 2,874 Balance at December 31, 2020 12,814 BancShares individually reviews loans greater than $500 thousand that are determined to be collateral-dependent. These collateral-dependent loans are evaluated based on the fair value of the underlying collateral as repayment of the loan is expected to be made through the operation or sale of the collateral. Commercial and industrial loans and leases are collateralized by business assets, while the remaining loan classes are collateralized by real property. The following table presents information on collateral-dependent loans by class and includes the amortized cost of collateral-dependent loans and leases, the net realizable value of the collateral, the extent to which collateral secures collateral-dependent loans and the associated ACL as of December 31, 2020 were as follows: (Dollars in thousands) Collateral-Dependant Loans Net Realizable Value of Collateral Collateral Coverage Allowance for Credit Losses Commercial loans: Construction and land development $ 1,424 $ 1,795 126.1 % $ — Owner occupied commercial mortgage 9,792 14,253 145.6 — Non-owner occupied commercial mortgage 5,556 7,577 136.4 — Total commercial loans 16,772 23,625 140.9 — Consumer: Residential mortgage 23,011 29,775 129.4 131 Total non-PCD loans 39,783 53,400 134.2 131 PCD 19,042 27,872 146.4 — Total collateral-dependent loans $ 58,825 $ 81,272 138.2 % $ 131 Collateral-dependent nonaccrual loans with no recorded allowance totaled $57.5 million as of December 31, 2020. All other nonaccrual loans have a recorded allowance. Allowance for Loan and Lease Losses Prior to adoption of ASC 326, management calculated estimated loan losses through the allowance for loan and lease losses (“ALLL”). The ALLL represented management’s best estimate of inherent credit losses within the loan and lease portfolio at the balance sheet date. Management determined the ALLL based on an ongoing evaluation of the loan portfolio. Estimates for loan losses were determined by analyzing quantitative and qualitative components, such as: economic conditions, historical loan losses, historical loan migration to charge-off experience, current trends in delinquencies and charge-offs, expected cash flows on PCI loans, current assessment of impaired loans, and changes in the size, composition and/or risk within the loan portfolio. Adjustments to the ALLL were recorded with a corresponding entry to provision for loan and lease losses. Loan balances considered uncollectible were charged-off against the ALLL. Recoveries of amounts previously charged-off were generally credited to the ALLL. A primary component of determining the allowance on non-PCI loans collectively evaluated was the actual loss history of the various loan classes. Loan loss factors were based on historical experience and, when necessary, were adjusted for significant factors, that in management’s judgment, affect the collectability of principal and interest at the balance sheet date. Loan loss factors were monitored quarterly and, when necessary, adjusted based on changes in the level of historical net charge-offs and updates by management, such as the number of periods included in the calculation of loss factors, loss severity, loss emergence period and portfolio attrition. For commercial non-PCI loans, management incorporated historical net loss data to develop the applicable loan loss factors. General reserves for collective impairment were based on incurred loss estimates for the loan class based on average loss rates by credit quality indicators, which were estimated using historical loss experience and credit risk rating migrations. Credit quality indicators include borrower classification codes and facility risk ratings. Incurred loss estimates were adjusted through a qualitative assessment to reflect current economic conditions and portfolio trends including credit quality, concentrations, aging of the portfolio and significant policy and underwriting changes. For noncommercial non-PCI loans, management incorporated specific loan class and delinquency status trends into the loan loss factors. General reserve estimates of incurred losses were based on historical loss experience and the migration of loans through the various delinquency pools applied to the current risk mix. Non-PCI loans were considered to be impaired when, based on current information and events, it was probable that a borrower would be unable to pay all amounts due according to the contractual terms of the loan agreement. Generally, management considered the following loans to be impaired: all TDR loans and all loan relationships which were on nonaccrual or 90+ days past due and greater than $500,000. Non-PCI impaired loans greater than $500,000 were evaluated individually for impairment while others were evaluated collectively. The impairment assessment and determination of the related specific reserve for each impaired loan was based on the loan’s characteristics. Impairment measurement for loans dependent on borrower cash flow for repayment was based on the present value of expected cash flows discounted at the interest rate implicit in the original loan agreement. Impairment measurement for most real estate loans, particularly when a loan was considered to be a probable foreclosure, was based on the fair value of the underlying collateral. Collateral was appraised and market value (appropriately adjusted for an assessment of the sales and marketing costs) was used to calculate a fair value estimate. A specific valuation allowance was established or partial charge-off was recorded for the difference between the excess recorded investment in the loan and the loan’s estimated fair value less costs to sell. The ALLL for PCI loans was estimated based on the expected cash flows over the life of the loan. BancShares estimated and updated cash flows expected to be collected on individual loans or pools of loans sharing common risk characteristics. BancShares compared the carrying value of all PCI loans to the present value at each balance sheet date. If the present value was less than the carrying value, the shortfall reduced the remaining credit discount and if it was in excess of the remaining credit discount, an ALLL was recorded through the recognition of provision expense. The ALLL for PCI loans with subsequent increases in expected cash flows to be collected was reduced and any remaining excess was recorded as an adjustment to the accretable yield over the loan’s or pool’s remaining life. The following tables present the allowance and recorded investment in loans and leases by class of loans, as well as the associated impairment method at December 31, 2019. December 31, 2019 (Dollars in thousands) Construction Commercial Other Commercial Other Residential Revolving Construction Consumer Total Non-PCI Loans Allowance for loan and lease losses: ALLL for loans and leases individually evaluated for impairment $ 463 $ 3,650 $ 39 $ 1,379 $ 103 $ 3,278 $ 2,722 $ 174 $ 1,107 $ 12,915 ALLL for loans and leases collectively evaluated for impairment 32,750 41,685 2,172 57,995 2,133 14,954 16,980 2,535 33,486 204,690 Total allowance for loan and lease losses $ 33,213 $ 45,335 $ 2,211 $ 59,374 $ 2,236 $ 18,232 $ 19,702 $ 2,709 $ 34,593 $ 217,605 Loans and leases: Loans and leases individually evaluated for impairment $ 4,655 $ 70,149 $ 1,268 $ 12,182 $ 639 $ 60,442 $ 28,869 $ 3,882 $ 3,513 $ 185,599 Loans and leases collectively evaluated for impairment 1,008,799 12,212,486 540,760 4,391,610 309,454 5,233,475 2,310,203 353,503 1,776,891 28,137,181 Total loan and leases $ 1,013,454 $ 12,282,635 $ 542,028 $ 4,403,792 $ 310,093 $ 5,293,917 $ 2,339,072 $ 357,385 $ 1,780,404 $ 28,322,780 The following table presents the PCI allowance and recorded investment in loans at December 31, 2019. (Dollars in thousands) December 31, 2019 Allowance for loan losses: ALLL for loans acquired with deteriorated credit quality $ 7,536 Loans acquired with deteriorated credit quality 558,716 At December 31, 2019, $139.4 million, respectively, in PCI loans experienced an adverse change in expected cash flows since the date of acquisition. The corresponding valuation reserve was $7.5 million. The following tables present the recorded investment and related allowance in non-PCI impaired loans and leases by class of loans, as well as the unpaid principle balance. December 31, 2019 (Dollars in thousands) With a With no Total Unpaid Related Non-PCI impaired loans and leases Commercial: Construction and land development $ 1,851 $ 2,804 $ 4,655 $ 5,109 $ 463 Commercial mortgage 42,394 27,755 70,149 74,804 3,650 Other commercial real estate 318 950 1,268 1,360 39 Commercial and industrial and leases 7,547 4,635 12,182 13,993 1,379 Other 406 233 639 661 103 Total commercial loans 52,516 36,377 88,893 95,927 5,634 Noncommercial: Residential mortgage 48,796 11,646 60,442 64,741 3,278 Revolving mortgage 26,104 2,765 28,869 31,960 2,722 Construction and land development 2,470 1,412 3,882 4,150 174 Consumer 3,472 41 3,513 3,821 1,107 Total noncommercial loans 80,842 15,864 96,706 104,672 7,281 Total non-PCI impaired loans and leases $ 133,358 $ 52,241 $ 185,599 $ 200,599 $ 12,915 Non-PCI impaired loans less than $500,000 that were collectively evaluated was $41.0 million at December 31, 2019. The following tables show the average non-PCI impaired loan balance and the interest income recognized by loan class for the years ended December 31, 2019 and 2018: 2019 2018 (Dollars in thousands) Average Interest Income Recognized Average Interest Income Recognized Non-PCI impaired loans and leases: Commercial: Construction and land development $ 3,915 $ 53 $ 1,734 $ 84 Commercial mortgage 64,363 2,188 65,943 2,569 Other commercial real estate 919 27 1,225 43 Commercial and industrial and leases 11,884 482 9,560 364 Other 396 11 135 3 Total commercial 81,477 2,761 78,597 3,063 Noncommercial: Residential mortgage 52,045 1,386 41,368 1,237 Revolving mortgage 29,516 1,009 26,759 900 Construction and land development 3,589 116 3,677 172 Consumer 3,311 138 2,722 116 Total noncommercial 88,461 2,649 74,526 2,425 Total non-PCI impaired loans and leases $ 169,938 $ 5,410 $ 153,123 $ 5,488 Troubled Debt Restructurings BancShares accounts for certain loan modifications or restructurings as TDRs. In general, the modification or restructuring of a loan is considered a TDR if, for economic or legal reasons related to a borrower’s financial difficulties, a concession is granted to the borrower that creditors would not otherwise consider. Concessions may relate to the contractual interest rate, maturity date, payment structure or other actions. Within our allowance for credit loss models, TDRs are not individually evaluated unless determined to be collateral-dependent and are included in the definition of default which provides for a 100% probability of default applied within the models. As a result, subsequent changes in default status do not impact the calculation of the allowance for credit losses on TDR loans. The Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus was published by banking regulators in April 2020 to clarify expectations around loan modifications and the determination of TDRs for borrowers experiencing COVID-19-related financial difficulty. BancShares applied this regulatory guidance during its TDR identification process for short-term loan forbearance agreements as a result of COVID-19 and in most cases is not recording these as TDRs. The following tables provides a summary of total TDRs by accrual status. Total TDRs at December 31, 2020 were $208.2 million. Total TDRs at December 31, 2019, were $171.2 million, of which $154.0 million were non-PCI and $17.2 million were PCI. Total TDRs at December 31, 2018, were $156.1 million, of which $137.9 million were non-PCI and $18.2 million were PCI. December 31, 2020 (Dollars in thousands) Accruing Nonaccruing Total Commercial loans: Construction and land development $ 578 $ 54 $ 632 Owner occupied commercial mortgage 37,574 10,889 48,463 Non-owner occupied commercial mortgage 18,336 1,649 19,985 Commercial and industrial and leases 29,131 3,528 32,659 Total commercial loans 85,619 16,120 101,739 Consumer: Residential mortgage 29,458 19,380 48,838 Revolving mortgage 20,124 7,128 27,252 Construction and land development 1,573 9 1,582 Consumer auto 2,018 696 2,714 Consumer other 955 137 1,092 Total consumer loans 54,128 27,350 81,478 PCD loans 17,617 7,346 24,963 Total loans $ 157,364 $ 50,816 $ 208,180 December 31, 2019 December 31, 2018 (Dollars in thousands) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial loans: Construction and land development $ 487 $ 2,279 $ 2,766 $ 1,946 $ 352 $ 2,298 Commercial mortgage 50,819 11,116 61,935 53,270 7,795 61,065 Other commercial real estate 571 — 571 851 9 860 Commercial and industrial and leases 9,430 2,409 11,839 7,986 2,060 10,046 Other 320 105 425 118 173 291 Total commercial loans 61,627 15,909 77,536 64,171 10,389 74,560 Noncommercial: Residential mortgage 41,813 16,048 57,861 37,903 9,621 47,524 Revolving mortgage 21,032 7,367 28,399 20,492 8,196 28,688 Construction and land development 1,452 2,430 3,882 2,227 110 2,337 Consumer 2,826 688 3,514 2,300 721 3,021 Total noncommercial loans 67,123 26,533 93,656 62,922 18,648 81,570 Total loans $ 128,750 $ 42,442 $ 171,192 $ 127,093 $ 29,037 $ 156,130 The following tables provide the types of modifications designated TDRs made during the years ended December 31, 2020, 2019 and 2018, as well as a summary of loans that were modified as a TDR during the years ended December 31, 2020, 2019 and 2018 that subsequently defaulted during the years ended December 31, 2020, 2019 and 2018. BancShares defines payment default as movement of the TDR to nonaccrual status, which is generally 90 days past due, foreclosure or charge-off, whichever occurs first. 2020 2019 2018 All restructurings Restructurings with payment default All restructurings Restructurings with payment default All restructurings Restructurings with payment default Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end (Dollars in thousands) Loans and leases Interest only period provided Commercial loans 31 $ 28,145 4 $ 4,498 11 $ 1,595 1 $ 238 3 $ 1,003 — $ — Consumer loans 6 4,169 5 2,569 7 4,018 2 2,717 — — — — Total interest only 37 32,314 9 7,067 18 5,613 3 2,955 3 1,003 — — Loan term extension Commercial loans 26 5,444 5 1,471 16 3,904 5 533 21 3,933 4 675 Consumer loans 66 5,689 43 3,241 2 342 1 306 21 1,554 4 190 Total loan term extension 92 11,133 48 4,712 18 4,246 6 839 42 5,487 8 865 Below market interest rate Commercial loans 98 33,870 26 1,912 90 13,932 24 2,634 85 12,859 24 2,998 Consumer loans 156 6,074 60 3,897 176 12,458 66 4,014 184 15,545 68 5,461 Total below market interest rate 254 39,944 86 5,809 266 26,390 90 6,648 269 28,404 92 8,459 Discharged from bankruptcy Commercial loans 30 1,168 17 286 25 5,571 20 5,028 26 2,043 8 825 Consumer loans 186 8,129 66 2,928 178 10,349 71 4,239 151 6,617 56 3,169 Total discharged from bankruptcy 216 9,297 83 3,214 203 15,920 91 9,267 177 8,660 64 3,994 Total restructurings 599 $ 92,688 226 $ 20,802 505 $ 52,169 190 $ 19,709 491 $ 43,554 164 $ 13,318

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Premises and Equipment	PREMISES AND EQUIPMENT Major classifications of premises and equipment at December 31, 2020 and 2019 are summarized as follows: (Dollars in thousands) Useful Life ( years ) 2020 2019 Land indefinite $ 336,258 $ 335,093 Premises and leasehold improvements 3 - 40 1,286,092 1,228,588 Furniture, equipment and software 3 - 10 639,109 595,686 Total 2,261,459 2,159,367 Less accumulated depreciation and amortization 1,010,176 914,971 Total premises and equipment $ 1,251,283 $ 1,244,396

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2020
Other Real Estate [Abstract]
Other Real Estate Owned	OTHER REAL ESTATE OWNED The following table explains changes in other real estate owned (“OREO”) for the years ended December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Balance at January 1 $ 46,591 $ 48,030 Additions 26,822 21,684 Acquired in business combinations 9,813 5,459 Sales (26,726) (24,432) Write-downs/losses (5,610) (4,150) Balance at December 31 50,890 46,591 At December 31, 2020 and 2019, BancShares had $5.8 million and $14.5 million, respectively, of foreclosed residential real estate property in OREO. The recorded investment in consumer mortgage loans collateralized by residential real estate property in the process of foreclosure was $29.4 million and $23.0 million at December 31, 2020, and 2019, respectively. Gains recorded on the sale of OREO were $1.6 million and $1.5 million for the years ended December 31, 2020 and 2019, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill BancShares’ annual impairment test, conducted as of July 31 each year, or more frequently if events occur or circumstances change that may trigger a decline in the value of the reporting unit or otherwise indicate that a potential impairment exists, resulted in no indication of goodwill impairment. Subsequent to the annual impairment test, there were no events or changes in circumstances that would indicate goodwill should be tested for impairment during the interim period between annual tests. No goodwill impairment was recorded during 2020 or 2019. The following table presents the changes in the carrying amount of goodwill as of December 31, 2020 and 2019: Year ended December 31 (Dollars in thousands) 2020 2019 Balance at January 1 $ 349,398 $ 236,347 Recognized in the Community Financial acquisition 686 — Measurement period adjustments (1) 214 — Recognized in the Biscayne Bancshares acquisition — 46,521 Recognized in the First South Bancorp acquisition — 13,896 Recognized in the Entegra acquisition — 52,634 Balance at December 31 $ 350,298 $ 349,398 (1) See Note B, Business Combinations for additional information Other Intangible Assets Other intangible assets include mortgage servicing rights (“MSRs”) on loans sold to third parties with servicing retained, core deposit intangibles which represent the estimated fair value of acquired core deposits and other customer relationships, and other intangible assets acquired such as other servicing rights and noncompete agreements. Mortgage Servicing Rights Our portfolio of residential mortgage loans serviced for third parties was $3.31 billion, $3.38 billion and $2.95 billion as of December 31, 2020, 2019 and 2018, respectively. The majority of these loans were originated by BancShares and sold to third parties on a non-recourse basis with servicing rights retained. At December 31, 2020, a portion of the MSRs were related to originations by Entegra prior to acquisition. These retained servicing rights are recorded as a servicing asset and reported in other intangible assets. The mortgage servicing rights are initially recorded at fair value and then carried at the lower of amortized cost or fair market value. The amortization expense related to mortgage servicing rights is included as a reduction of mortgage income. The activity of the mortgage servicing asset for the years ended December 31, 2020, 2019 and 2018 is presented in the following table: (Dollars in thousands) 2020 2019 2018 Balance at January 1 $ 22,963 $ 21,396 $ 21,945 Servicing rights originated 8,006 6,149 5,258 Servicing rights acquired in Entegra transaction — 1,873 — Amortization (8,400) (6,233) (5,807) Valuation allowance increase (4,143) (222) — Balance at December 31 $ 18,426 $ 22,963 $ 21,396 The following table presents the activity in the servicing asset valuation allowance for the years ended December 31, 2020, 2019 and 2018: (Dollars in thousands) 2020 2019 2018 Beginning balance $ 222 $ — $ — Valuation allowance increase 4,143 222 — Ending balance $ 4,365 $ 222 $ — Valuation of mortgage servicing rights is performed using a pooling methodology. Similar loans are pooled together and evaluated on a discounted earnings basis to determine the present value of future earnings. Contractually specified mortgage servicing fees, late fees and ancillary fees earned for the years ended December 31, 2020, 2019 and 2018, were $8.5 million, $7.9 million and $7.5 million, respectively, and reported in mortgage income. Key economic assumptions used to value mortgage servicing rights as of December 31, 2020 and 2019, were as follows: 2020 2019 Discount rate - conventional fixed loans 7.92 % 8.92 % Discount rate - all loans excluding conventional fixed loans 8.92 % 9.92 % Weighted average constant prepayment rate 20.62 % 13.72 % Weighted average cost to service a loan $ 87.58 $ 87.09 The discount rate is based on the 10-year U.S. Treasury rate plus 700 basis points for conventional fixed loans and 800 basis points for all other loans. The 700 and 800 basis points are used as a risk premium when calculating the discount rate. The prepayment rate is derived from the Public Securities Association Standard Prepayment model, which compared to actual prepayment rates annually for reasonableness. The average cost to service a loan is based on the number of loans serviced and the total costs to service the loans. Core Deposit Intangibles Core deposit intangibles represent the estimated fair value of core deposits and other customer relationships acquired. They are being amortized on an accelerated basis over their estimated useful lives. The weighted average useful life of core deposit intangibles acquired in 2020 is 9 years. The following information relates to core deposit intangible assets, which are being amortized over their estimated useful lives: (Dollars in thousands) 2020 2019 Balance at January 1 $ 43,386 $ 48,232 Acquired in Community Financial transaction 536 — Acquired in Biscayne Bancshares transaction — 4,745 Acquired in First South Bancorp transaction — 2,268 Acquired in Entegra transaction — 4,487 Amortization (14,255) (16,346) Balance at December 31 $ 29,667 $ 43,386 The gross amount of core deposit intangible assets and accumulated amortization as of December 31, 2020 and 2019, are: (Dollars in thousands) 2020 2019 Gross balance $ 127,842 $ 154,507 Accumulated amortization (98,175) (111,121) Carrying value $ 29,667 $ 43,386 Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for core deposit intangibles in subsequent periods will be: (Dollars in thousands) 2021 $ 10,948 2022 7,743 2023 5,129 2024 2,658 2025 and subsequent 3,189 $ 29,667

Deposits

Deposits	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Deposits	DEPOSITS Deposits at December 31, 2020 and 2019 were as follows: (Dollars in thousands) 2020 2019 Demand $ 18,014,029 $ 12,926,796 Checking with interest 10,591,687 8,284,302 Money market accounts 8,632,713 6,817,752 Savings 3,304,167 2,564,777 Time 2,889,013 3,837,609 Total deposits $ 43,431,609 $ 34,431,236 Time deposits with a denomination of $250,000 or more were $670.4 million and $891.2 million at December 31, 2020 and 2019, respectively. At December 31, 2020, the scheduled maturities of time deposits were: (Dollars in thousands) Year ended December 31 2021 $ 1,844,860 2022 648,516 2023 143,272 2024 67,908 2025 42,960 Thereafter 141,497 Total time deposits $ 2,889,013

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Borrowings	BORROWINGS Short-term Borrowings Short-term borrowings at December 31, 2020 and 2019 are as follows: (Dollars in thousands) 2020 2019 Securities sold under customer repurchase agreements $ 641,487 $ 442,956 Notes payable to FHLB of Atlanta — 255,000 Other short-term debt — 40,277 Total short-term borrowings $ 641,487 $ 738,233 At December 31, 2020, BancShares had unused credit lines allowing contingent access to overnight borrowings of up to $598.0 million on an unsecured basis. Additionally, under borrowing arrangements with the FRB of Richmond and FHLB of Atlanta, BancShares has access to an additional $11.31 billion on a secured basis. Repurchase Agreements BancShares utilizes securities sold under agreements to repurchase to facilitate the needs of customers and secure wholesale funding needs. Repurchase agreements are transactions whereby BancShares offers to sell to a counterparty an undivided interest in an eligible security at an agreed upon purchase price, and which obligates BancShares to repurchase the security at an agreed upon date, repurchase price and interest rate. These agreements are recorded at the amount of cash received in connection with the transaction and are reflected as securities sold under customer repurchase agreements. BancShares monitors collateral levels on a continuous basis and maintains records of each transaction specifically describing the applicable security and the counterparty’s fractional interest in that security, and segregates the security from general assets in accordance with regulations governing custodial holdings of securities. The primary risk with repurchase agreements is market risk associated with the investments securing the transactions, as additional collateral may be required based on fair value changes of the underlying investments. Securities pledged as collateral under repurchase agreements are maintained with safekeeping agents. The carrying value of investment securities pledged as collateral under repurchase agreements was $689.3 million and $477.6 million at December 31, 2020 and December 31, 2019, respectively. At December 31, 2020, BancShares held $641.5 million of securities sold under agreements to repurchase, with overnight and continuous remaining contractual maturities, made up of $432.8 million collateralized by government agency securities and $208.7 million collateralized by commercial mortgage-backed securities. At December 31, 2019, BancShares held securities sold under agreements to repurchase of $443.0 million, with overnight and continuous remaining contractual maturities collateralized by government agency securities. Long-term Borrowings Long-term borrowings at December 31, 2020 and 2019 include: (Dollars in thousands) 2020 2019 Fixed-to-Floating subordinated notes at 3.375% maturing March 15, 2030 $ 350,000 $ — Junior subordinated debenture at 3-month LIBOR plus 1.75% maturing June 30, 2036 88,145 88,145 Junior subordinated debenture at 3-month LIBOR plus 2.25% maturing June 15, 2034 19,588 19,588 Junior subordinated debenture at 3-month LIBOR plus 2.85% maturing April 7, 2034 10,310 10,310 Junior subordinated debentures at 3-month LIBOR plus 2.80% maturing March 30, 2034 14,433 14,433 Junior subordinated debentures at 7.00% maturing December 31, 2026 (1) 20,000 20,000 Junior subordinated debentures at 6.50% maturing October 1, 2025 (2) 7,500 7,500 Junior subordinated debentures at 7.13% called February 25, 2020 (2) — 5,000 Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032 655,175 317,191 Unsecured term loan at 1-month LIBOR plus 1.10% maturing September 5, 2022 82,125 96,425 Obligations under capitalized leases extending to December 2050 6,308 8,230 Unamortized issuance costs (3,459) — Unamortized purchase accounting adjustments (3) (1,999) (1,569) Other long-term debt 37 3,385 Total long-term obligations $ 1,248,163 $ 588,638 (1) Assumed in HomeBancorp acquisition. (2) Assumed in Biscayne BancShares acquisition. (3) At December 31, 2020, unamortized purchase accounting adjustments were $2.0 million for subordinated debentures. At December 31, 2019, unamortized purchase accounting adjustments were $1.6 million for subordinated debentures and $6 thousand for FHLB advances. Issuance of Subordinated Debt On March 4, 2020, BancShares completed its public offering of $350 million aggregate principal amount of its 3.375% Fixed-to-Floating Rate Subordinated Notes due 2030 and redeemable at the option of BancShares starting with the interest payment due March 15, 2025, subject to obtaining the prior approval of the Federal Reserve to the extent such approval is then required under the rules of the Federal Reserve, or earlier upon the occurrence of certain events. At December 31, 2020 and 2019, BancShares held $132.5 million in junior subordinated debentures representing obligations to FCB/NC Capital Trust III, FCB/SC Capital Trust II, SCB Capital Trust I and Macon Capital Trust I special purpose entities and grantor trusts (“the Trusts”) for trust preferred securities. The Trusts had outstanding trust preferred securities of $128.5 million at December 31, 2020 and 2019, which mature in 2036, 2034, 2034 and 2034, respectively, and may be redeemed at par in whole or in part at any time. BancShares has guaranteed all obligations of its subsidiaries, FCB Capital Trust III and FCB/SC Capital Trust II. FCB has guaranteed all obligations of its trust subsidiaries, SCB Capital Trust I and Macon Capital Trust I, which was acquired from Entegra during the fourth quarter of 2019 and has a related obligation of $14.4 million. Long-term borrowings maturing in each of the five years subsequent to December 31, 2020 and thereafter include: (Dollars in thousands) Year ended December 31 2021 $ 10,000 2022 98,709 2023 125,500 2024 6,144 2025 7,500 Thereafter 1,000,310 Total long-term borrowings $ 1,248,163

FDIC Shared-Loss Payable

FDIC Shared-Loss Payable	12 Months Ended
	Dec. 31, 2020
FDIC Shared-Loss Receivable [Abstract]
Receivable from FDIC for Loss Share Agreements	FDIC SHARED-LOSS PAYABLE At December 31, 2020, shared-loss protection remains for single family residential loans acquired in the amount of $34.5 million. The shared-loss agreements for two FDIC-assisted transactions include provisions related to payments owed to the FDIC at the termination of the agreements if actual cumulative losses on covered assets are lower than originally estimated by the FDIC at the time of acquisition (“clawback liability”). As of December 31, 2020 and 2019, the estimated clawback liability was $15.6 million and $112.4 million, respectively, as a result of a payment to the FDIC in the first quarter of 2020 for $99.5 million related to one of the transactions. We expect to make a clawback liability payment to the FDIC in March 2021 in the amount of $15.9 million. The following table provides changes in the FDIC shared-loss payable for the years ended December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Beginning balance $ 112,395 $ 105,618 Accretion 2,674 6,777 Payment made to the FDIC to settle shared-loss agreement (99,468) — Ending balance $ 15,601 $ 112,395

Shareholders' Equity, Dividends

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters	12 Months Ended
	Dec. 31, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Shareholders' Equity, Dividend Restrictions and Other Regulatory Matters	SHAREHOLDERS’ EQUITY, DIVIDEND RESTRICTIONS AND OTHER REGULATORY MATTERS BancShares and FCB are required to meet minimum capital requirements set forth by regulatory authorities. Certain activities such as, the ability to undertake new business initiatives, including acquisitions, the access to and cost of funding for new business initiatives, the ability to pay dividends, the ability to repurchase shares or other capital instruments, the level of deposit insurance costs, and the level and nature of regulatory oversight depend, in large part, on a financial institution’s capital strength. Bank regulatory agencies approved regulatory capital guidelines (“Basel III”) aimed at strengthening existing capital requirements for banking organizations. Basel III became effective for BancShares on January 1, 2015. Under Basel III, requirements include a common equity Tier 1 ratio minimum of 4.50%, Tier 1 risk-based capital minimum of 6.00%, total risk-based capital ratio minimum of 8.00% and Tier 1 leverage capital ratio minimum of 4.00%. Failure to meet minimum capital requirements may result in certain actions by regulators that could have a direct, material effect on the consolidated financial statements. Based on the most recent notifications from its regulators, BancShares and FCB is well-capitalized under the regulatory framework for prompt corrective action. As of December 31, 2020, BancShares and FCB met all capital adequacy requirements to which they are subject and were not aware of any conditions or events that would affect each entity’s well-capitalized status. Following is an analysis of capital ratios under Basel III guidelines for BancShares and FCB as of December 31, 2020 and 2019: December 31, 2020 December 31, 2019 (Dollars in thousands) Requirements to be well-capitalized Amount Ratio Amount Ratio BancShares Total risk-based capital 10.00 % $ 4,577,212 13.81 % $ 3,731,501 12.12 % Tier 1 risk-based capital 8.00 3,856,086 11.63 3,344,305 10.86 Common equity Tier 1 6.50 3,516,149 10.61 3,344,305 10.86 Leverage capital 5.00 3,856,086 7.86 3,344,305 8.81 FCB Total risk-based capital 10.00 4,543,496 13.72 3,837,670 12.46 Tier 1 risk-based capital 8.00 4,276,870 12.92 3,554,974 11.54 Common equity Tier 1 6.50 4,276,870 12.92 3,554,974 11.54 Leverage capital 5.00 4,276,870 8.72 3,554,974 9.38 As of January 1, 2019, the capital conservation buffer was fully phased in at 2.50%. BancShares and FCB had capital conservation buffers of 5.63% and 5.72%, respectively, at December 31, 2020. At December 31, 2020, Tier 2 capital of BancShares included $128.5 million of trust preferred capital securities and $377.5 million of qualifying subordinated debentures, compared to $128.5 million of trust preferred capital securities and $32.5 million of qualifying subordinated debentures included at December 31, 2019. BancShares has two classes of common stock—Class A common and Class B common shares. Shares of Class A common have one vote per share, while shares of Class B common have 16 votes per share. During 2020, BancShares repurchased a total of 813,090 shares of Class A common stock, or 8.4% of outstanding shares of as of December 31, 2019, for $333.8 million at an average cost per share of $410.48. During 2019 , BancShares repurchased a total of 998,910 shares of Class A common stock, or 9.4% of outstanding shares of as of December 31, 2018, for $450.8 million at an average cost per share of $451.33 . All share repurchases were executed under previously approved authorities. Upon expiration of the most recent share repurchase authorization on July 31, 2020, share repurchase activity has ended and will be reevaluated in subsequent periods. Issuance of Depositary Shares On March 12, 2020, BancShares issued and sold an aggregate of 13,800,000 depositary shares (the “Depositary Shares”), each representing a 1/40th interest in a share of 5.375% Non-Cumulative Perpetual Preferred Stock, Series A, par value $0.01 per share (the “Series A Preferred Stock”), with a liquidation preference of $25 per Depositary Share (equivalent to $1,000 per share of the Series A Preferred Stock) for a total of $345 million. The capital raise provides liquidity for general corporate purposes, which may include, but is not limited to, providing capital to support our growth organically or through strategic acquisitions, financing investments and capital expenditures, for funding investments in First Citizens Bank as regulatory capital, and redeeming or repurchasing BancShares’ common stock. Dividend Restrictions The Board of Directors of FCB may approve distributions, including dividends, as it deems appropriate, subject to the requirements of the FDIC and the General Statutes of North Carolina, provided that the distributions do not reduce capital below applicable capital requirements. As of December 31, 2020, the maximum amount of distributions was limited to $1.70 billion to preserve well-capitalized status. Dividends declared by FCB and paid to BancShares amounted to $229.7 million in 2020, $149.8 million in 2019 and $242.9 million in 2018. Payment of dividends is made at the discretion of the Board of Directors and is contingent upon satisfactory earnings as well as projected future capital needs. BancShares’ principal source of liquidity for payment of shareholder dividends is the dividend it receives from FCB. BancShares and FCB are subject to various requirements imposed by state and federal banking statutes and regulations, including regulations requiring the maintenance of reserve balances at the Federal Reserve Bank. Banks are allowed to reduce the required balances by the amount of vault cash. For 2020, the requirements averaged $115.2 million. Effective March 26, 2020, the Federal Reserve Board reduced the reserve requirement ratio to 0%, eliminating the reserve requirement for all depository institutions.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated other comprehensive income (loss) included the following at December 31, 2020 and 2019: December 31, 2020 December 31, 2019 (Dollars in thousands) Accumulated Deferred Accumulated Accumulated Deferred Accumulated Unrealized gains on securities available for sale $ 102,278 $ 23,524 $ 78,754 $ 7,522 $ 1,730 $ 5,792 Unrealized gains on securities available for sale transferred from (to) held to maturity 5,399 1,242 4,157 — — — Defined benefit pension items (91,751) (21,103) (70,648) (172,098) (39,583) (132,515) Total $ 15,926 $ 3,663 $ 12,263 $ (164,576) $ (37,853) $ (126,723) The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2020 and 2019: (Dollars in thousands) Unrealized gains (losses) on securities available-for-sale (1) Unrealized gains (losses) on securities available for sale transferred to held to maturity (1)(2) Defined benefit pension items (1) Total Balance at January 1, 2019 $ (38,505) $ (71,149) $ (125,533) $ (235,187) Net unrealized gains (losses) arising during period 49,776 55,834 (15,438) 90,172 Amounts reclassified from accumulated other comprehensive loss (5,479) 15,315 8,456 18,292 Net current period other comprehensive income (loss) 44,297 71,149 (6,982) 108,464 Balance at December 31, 2019 5,792 — (132,515) (126,723) Net unrealized gains arising during period 119,357 4,538 42,367 166,262 Amounts reclassified from accumulated other comprehensive loss (46,395) (381) 19,500 (27,276) Net current period other comprehensive income 72,962 4,157 61,867 138,986 Balance at December 31, 2020 $ 78,754 $ 4,157 $ (70,648) $ 12,263 (1) All amounts are net of tax. Amounts in parentheses indicate debits. (2) Net unrealized gains (losses) represent unrealized gains and losses related to the reclassification of investment securities between categories. See Note C, Investments, for additional information. The following table presents the amounts reclassified from accumulated other comprehensive income (loss) and the line item affected in the statement where net income is presented for years ended December 31, 2020 and 2019: (Dollars in thousands) Year ended December 31, 2020 Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss) (1) Affected line item in the statement where net income is presented Unrealized gains on available for sale securities $ 60,253 Realized gains on investment securities available for sale, net (13,858) Income taxes $ 46,395 Amortization of unrealized gains on securities available for sale transferred to held to maturity $ 495 Net interest income (114) Income taxes $ 381 Amortization of actuarial losses on defined benefit pension items $ (25,324) Other noninterest expense 5,824 Income taxes $ (19,500) Total reclassifications for the period $ 27,276 Year ended December 31, 2019 Details about accumulated other comprehensive (loss) income Amount reclassified from accumulated other comprehensive income (loss) (1) Affected line item in the statement where net income is presented Unrealized gains on available for sale securities $ 7,115 Realized gains on investment securities available for sale, net (1,636) Income taxes $ 5,479 Amortization of unrealized losses on securities available for sale transferred to held to maturity $ (19,889) Net interest income 4,574 Income taxes $ (15,315) Amortization of defined benefit pension items Prior service costs $ (57) Salaries and wages Actuarial losses (10,924) Other noninterest expense (10,981) Income before income taxes 2,525 Income taxes $ (8,456) Total reclassifications for the period $ (18,292) (1) Amounts in parentheses indicate debits to profit/loss.

Other Noninterest Income and Ot

Other Noninterest Income and Other Noninterest Expense	12 Months Ended
	Dec. 31, 2020
Noninterest Expense [Abstract]
Other Noninterest Income and Other Noninterest Expense	OTHER NONINTEREST INCOME AND OTHER NONINTEREST EXPENSE Other noninterest income for the years ended December 31, 2020, 2019 and 2018 was $7.4 million, $18.4 million and $19.7 million, respectively. Prior to the adoption of ASC 326, the most significant item in other noninterest income was recoveries on PCI loans previously charged-off. BancShares recorded the portion of recoveries related to loans and leases written off prior to the closing of an acquisition as noninterest income rather than as an adjustment to the allowance for loan losses. These recoveries were $17.4 million and $16.6 million for the years ended December 31, 2019 and 2018, respectively. Following the adoption of ASC 326, these recoveries are recorded as an adjustment to the ACL. Other noninterest income also includes FHLB dividends and other various income items. Other noninterest expense for the years ended December 31, 2020, 2019 and 2018 included the following: (Dollars in thousands) 2020 2019 2018 Core deposit intangible amortization $ 14,255 $ 16,346 $ 17,165 Consultant expense 12,751 12,801 14,345 Advertising expense 10,010 11,437 11,650 Telecommunications expense 12,179 9,391 10,471 Other 95,922 89,308 93,432 Total other noninterest expense $ 145,117 $ 139,283 $ 147,063 Other expense consists of miscellaneous expenses including travel, postage, supplies, appraisal expense and other operational losses. Advertising expense related to non-direct response advertisements are expensed as incurred.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES At December 31, 2020, 2019 and 2018 income tax expense consisted of the following: (Dollars in thousands) 2020 2019 2018 Current tax expense Federal $ 137,162 $ 68,984 $ 95,151 State 14,532 11,095 21,523 Total current tax expense 151,694 80,079 116,674 Deferred tax (benefit) expense Federal (28,535) 50,522 (10,944) State 3,000 4,076 (2,433) Total deferred tax (benefit) expense (25,535) 54,598 (13,377) Total income tax expense $ 126,159 $ 134,677 $ 103,297 Income tax expense differed from the amounts computed by applying the statutory federal income tax rate of 21% to pretax income as a result of the following: (Dollars in thousands) 2020 2019 2018 Income taxes at federal statutory rates $ 129,755 $ 124,330 $ 105,758 Increase (reduction) in income taxes resulting from: Nontaxable income on loans, leases and investments, net of nondeductible expenses (1,581) (1,639) (1,796) Excess tax benefits of compensation 1,146 1,070 371 State and local income taxes, including any change in valuation allowance, net of federal income tax benefit 13,850 11,985 15,081 Effect of federal rate change — — (15,736) Tax credits net of amortization (5,367) (4,474) (2,891) Repayment of claim of right income (13,926) — — Other, net 2,282 3,405 2,510 Total income tax expense $ 126,159 $ 134,677 $ 103,297 The net deferred tax liability included the following components at December 31, 2020, and 2019: (Dollars in thousands) 2020 2019 Allowance for credit losses $ 52,293 $ 53,073 Operating lease liabilities 15,737 17,752 Executive separation from service agreements 8,989 12,334 Net operating loss carryforwards 9,545 11,085 Employee compensation 16,083 13,313 FDIC assisted transactions timing differences — 8,678 Other reserves 5,376 5,001 Other 6,898 10,698 Deferred tax asset 114,921 131,934 Accelerated depreciation 14,984 51,249 Lease financing activities 15,265 8,101 Operating lease assets 15,670 17,837 Net unrealized gain on securities included in accumulated other comprehensive loss 24,857 1,821 Net deferred loan fees and costs 13,975 11,781 Intangible assets 13,012 9,148 Security, loan and debt valuations 2,051 5,767 FDIC assisted transactions timing differences 2,393 — Pension liability 44,549 5,079 Other 10,193 15,993 Deferred tax liability 156,949 126,776 Net deferred tax (liability) asset $ (42,028) $ 5,158 At December 31, 2020, the gross tax benefit related to net operating loss carryforwards were $41.7 million and $19.5 million related to federal and state taxes, respectively. These carryforwards expire in years beginning in 2024. The net operating losses were obtained through various acquisitions and are subject to the annual limitations set forth by Internal Revenue Code Section 382. No valuation allowance was necessary as of December 31, 2020 and 2019, to reduce BancShares’ gross deferred tax asset to the amount more likely than not to be realized. Income tax expense for 2020 was favorably impacted by $13.9 million due to BancShares’ decision in the second quarter to utilize an allowable alternative for computing its 2020 federal income tax liability. The allowable alternative provides BancShares the ability to use the federal income tax rate for certain current year deductible amounts related to prior year FDIC-assisted acquisitions that was applicable when these amounts were originally subjected to tax. BancShares regularly adjusts its net deferred tax asset as a result of changes in tax rates in the state where it files tax returns. These changes in tax rates did not have a material impact on tax expense in 2020, 2019 or 2018. BancShares’ and its subsidiaries’ federal income tax returns for 2017 through 2019 remain open for examination. Generally, BancShares is no longer subject to examination by state and local taxing authorities for taxable years prior to 2015. The following table provides a rollforward of BancShares’ gross unrecognized tax benefits, excluding interest and penalties, during the years ended December 31, 2020, 2019 and 2018: (Dollars in thousands) 2020 2019 2018 Unrecognized tax benefits at the beginning of the year $ 32,226 $ 28,255 $ 29,004 Additions (reductions) related to tax positions taken in prior year 153 (683) (1,054) Additions related to tax positions taken in current year 1,295 6,554 1,433 Settlements (1,516) — — Reductions related to lapse of statute of limitations (783) (1,900) (1,128) Unrecognized tax benefits at the end of the year $ 31,375 $ 32,226 $ 28,255 All of the unrecognized tax benefits, if recognized, would affect BancShares’ effective tax rate. BancShares has unrecognized tax benefits relating to uncertain state tax positions in North Carolina and other state jurisdictions resulting from tax filings submitted to the states. No tax benefit has been recorded for these uncertain tax positions in the consolidated financial statements. BancShares does not expect the unrecognized tax benefits to change significantly during 2021.

Estimated Fair Values

Estimated Fair Values	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Estimated Fair Values	ESTIMATED FAIR VALUES Fair value represents the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. BancShares estimates fair value using discounted cash flows or other valuation techniques when there is no active market for a financial instrument. Inputs used in these valuation techniques are subjective in nature, involve uncertainties and require significant judgment. Therefore, the derived fair value estimates presented below are not necessarily indicative of the amounts BancShares would realize in a current market exchange. Assets and liabilities are recorded at fair value according to a fair value hierarchy comprised of three levels. The levels are based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. The level within the fair value hierarchy for an asset or liability is based on the lowest level of input significant to the fair value measurement with Level 1 inputs considered highest and Level 3 inputs considered lowest. A brief description of each input level follows: • Level 1 inputs are quoted prices in active markets for identical assets and liabilities. • Level 2 inputs are quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and inputs other than quoted prices observable for the assets or liabilities and market corroborated inputs. • Level 3 inputs are unobservable inputs for the asset or liability. These unobservable inputs and assumptions reflect the estimates market participants would use in pricing the asset or liability. BancShares’ management reviews any changes to its valuation methodologies to ensure they are appropriate and supportable, and refines valuation methodologies as more market-based data becomes available. Transfers between levels of the fair value hierarchy are recognized at the end of the reporting period. The methodologies used to estimate the fair value of financial assets and financial liabilities are discussed below. Investment securities available for sale . The fair value of U.S. Treasury, government agency, mortgage-backed and municipal securities and a portion of our corporate bonds are generally estimated using a third party pricing service. The third party provider evaluates securities based on comparable investments with trades and market data and will utilize pricing models which use a variety of inputs, such as benchmark yields, reported trades, issuer spreads, benchmark securities, bids and offers as needed. These securities are generally classified as Level 2. The remaining corporate bonds held are generally measured at fair value based on indicative bids from broker-dealers using inputs that are not directly observable. These securities are considered Level 3. Marketable equity securities. Equity securities are measured at fair value using observable closing prices. The valuation also considers the amount of market activity by examining the trade volume of each security. Equity securities are classified as Level 1 if they are traded in an active market and as Level 2 if the observable closing price is from a less than active market. Loans held for sale. Certain residential real estate loans originated to be sold to investors are carried at fair value based on quoted market prices for similar types of loans. Accordingly, the inputs used to calculate fair value of originated residential real estate loans held for sale are considered Level 2 inputs. Portfolio loans subsequently transferred to held for sale to be sold in the secondary market are transferred at fair value. The fair value of the transferred portfolio loans is based on quoted prices and considered Level 1 inputs. Net loans and leases (Non-PCD and PCD). Fair value is estimated based on discounted future cash flows using the current interest rates at which loans with similar terms would be made to borrowers of similar credit quality. The inputs used in the fair value measurements for loans and leases are considered Level 3 inputs. FHLB stock . The carrying amount of FHLB stock is a reasonable estimate of fair value, as these securities are not readily marketable and are evaluated for impairment based on the ultimate recoverability of the par value. BancShares considers positive and negative evidence, including the profitability and asset quality of the issuer, dividend payment history and recent redemption experience, when determining the ultimate recoverability of the par value. BancShares investment in FHLB stock is ultimately recoverable at par. The inputs used in the fair value measurement for the FHLB stock are considered Level 2 inputs. Mortgage and other servicing rights. Mortgage and other servicing rights are carried at the lower of amortized cost or market and are, therefore, carried at fair value only when fair value is less than the amortized cost. The fair value of mortgage and other servicing rights is performed using a pooling methodology. Similar loans are pooled together and a model which relies on discount rates, estimates of prepayment rates and the weighted average cost to service the loans is used to determine the fair value. The inputs used in the fair value measurement for mortgage and other servicing rights are considered Level 3 inputs. Deposits. For deposits with no stated maturity, the carrying value is a reasonable estimate of fair value. The fair value of time deposits is estimated by discounting future cash flows using the interest rates currently offered for deposits of similar remaining maturities. The inputs used in the fair value measurement for deposits are considered Level 2 inputs. Borrowings. For borrowings, the fair values are determined based on recent trades or sales of the actual security, if available. Otherwise, fair values are estimated by discounting future cash flows using current interest rates for similar financial instruments. The inputs used in the fair value measurement for FHLB borrowings, subordinated debentures, and other borrowings are considered Level 2 inputs. Payable to the FDIC for shared-loss agreements. The fair value of the payable to the FDIC for shared-loss agreements is determined by the projected cash flows based on expected payments to the FDIC in accordance with the shared-loss agreements. Cash flows are discounted using current discount rates to reflect the timing of the estimated amounts due to the FDIC. The inputs used in the fair value measurement for the payable to the FDIC are considered Level 3 inputs. Off-balance-sheet commitments and contingencies. Carrying amounts are reasonable estimates of the fair values for such financial instruments. Carrying amounts include unamortized fee income and, in some cases, reserves for any credit losses from those financial instruments. These amounts are not material to BancShares’ financial position. For all other financial assets and financial liabilities, the carrying value is a reasonable estimate of the fair value as of December 31, 2020 and 2019. The carrying value and fair value for these assets and liabilities are equivalent because they are relatively short-term in nature and there is no interest rate or credit risk that would cause the fair value to differ from the carrying value. Cash and due from banks is classified on the fair value hierarchy as Level 1. Overnight investments, income earned not collected and accrued interest payable are considered Level 2. The table presents the carrying values and estimated fair values for financial instruments as of December 31, 2020 and 2019. December 31, 2020 December 31, 2019 (Dollars in thousands) Carrying value Fair value Carrying value Fair value Cash and due from banks $ 362,048 $ 362,048 $ 376,719 $ 376,719 Overnight investments 4,347,336 4,347,336 1,107,844 1,107,844 Investment securities available for sale 7,014,243 7,014,243 7,059,674 7,059,674 Investment securities held to maturity 2,816,982 2,838,499 30,996 30,996 Investment in marketable equity securities 91,680 91,680 82,333 82,333 Loans held for sale 124,837 124,837 67,869 67,869 Net loans and leases 32,567,661 33,298,166 28,656,355 28,878,550 Income earned not collected 145,694 145,694 123,154 123,154 Federal Home Loan Bank stock 45,392 45,392 43,039 43,039 Mortgage and other servicing rights 19,628 20,283 24,891 26,927 Deposits with no stated maturity 40,542,596 40,542,596 30,593,627 30,593,627 Time deposits 2,889,013 2,905,577 3,837,609 3,842,162 Securities sold under customer repurchase agreements 641,487 641,487 442,956 442,956 Federal Home Loan Bank borrowings 655,175 677,579 572,185 577,362 Subordinated debt 504,518 525,610 163,412 173,685 Other borrowings 88,470 89,263 148,318 149,232 FDIC shared-loss payable 15,601 15,843 112,395 114,252 Accrued interest payable 9,414 9,414 18,124 18,124 Among BancShares’ assets and liabilities, investment securities available for sale, marketable equity securities and loans held for sale are reported at their fair values on a recurring basis. For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of December 31, 2020 and 2019. December 31, 2020 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Assets measured at fair value Investment securities available for sale U.S. Treasury $ 499,933 $ — $ 499,933 $ — Government agency 701,391 — 701,391 — Residential mortgage-backed securities 4,438,103 — 4,438,103 — Commercial mortgage-backed securities 771,537 — 771,537 — Corporate bonds 603,279 — 286,655 316,624 Total investment securities available for sale $ 7,014,243 $ — $ 6,697,619 $ 316,624 Marketable equity securities $ 91,680 $ 32,855 $ 58,825 — Loans held for sale 124,837 — 124,837 — December 31, 2019 Fair value measurements using: Fair value Level 1 Level 2 Level 3 Assets measured at fair value Investment securities available for sale U.S. Treasury $ 409,999 $ — $ 409,999 $ — Government agency 682,772 — 682,772 — Residential mortgage-backed securities 5,267,090 — 5,267,090 — Commercial mortgage-backed securities 380,020 — 380,020 — Corporate bonds 201,566 — 131,881 69,685 State, county and municipal 118,227 — 118,227 — Total investment securities available for sale $ 7,059,674 $ — $ 6,989,989 $ 69,685 Marketable equity securities $ 82,333 $ 29,458 $ 52,875 $ — Loans held for sale 67,869 — 67,869 — During the year ended December 31, 2020, $1.8 million of corporate bonds available for sale were transferred from Level 2 to Level 3. The transfers were due to a lack of observable inputs and trade activity for those securities. During the year ended December 31, 2019, $112.6 million of corporate bonds available for sale were transferred from Level 3 to Level 2. The transfers were due to the availability of additional observable inputs for those securities. The following table summarizes activity for Level 3 assets for the years ended December 31, 2020 and 2019: 2020 2019 (Dollars in thousands) Corporate bonds Corporate bonds Beginning balance $ 69,685 $ 143,226 Purchases (1) 242,595 35,993 Unrealized net gains included in other comprehensive income 2,898 3,891 Amounts included in net income (336) 174 Transfers in 1,782 — Transfers out — (112,599) Sales / Calls — (1,000) Ending balance $ 316,624 $ 69,685 (1) The year ended December 31, 2019, includes Corporate bonds of $500 thousand acquired in Entegra transaction. The following table presents quantitative information about Level 3 fair value measurements for fair value on a recurring basis at December 31, 2020. (Dollars in thousands) December 31, 2020 Level 3 assets Valuation technique Significant unobservable input Fair Value Corporate bonds Indicative bid provided by broker Multiple factors, including but not limited to, current operations, financial condition, cash flows, and recently executed financing transactions related to the issuer $ 316,624 Fair Value Option BancShares has elected the fair value option for residential real estate loans originated to be sold. This election reduces certain timing differences in the Consolidated Statements of Income and better aligns with the management of the portfolio from a business perspective. The changes in fair value are recorded as a component of mortgage income and were gains of $3.9 million, $289 thousand and $50 thousand for the years ended December 31, 2020, 2019 and 2018, respectively. The following table summarizes the difference between the aggregate fair value and the unpaid principal balance for residential real estate loans originated for sale measured at fair value as of December 31, 2020 and 2019. December 31, 2020 (Dollars in thousands) Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 124,837 $ 118,902 $ 5,935 December 31, 2019 Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 67,869 $ 65,697 $ 2,172 No originated loans held for sale were 90 or more days past due or on nonaccrual status as of December 31, 2020 or December 31, 2019. Certain other assets are adjusted to their fair value on a nonrecurring basis, including certain loans, OREO, goodwill, which are periodically tested for impairment, and mortgage servicing rights, which are carried at the lower of amortized cost or market. Most loans held for investment, deposits, and borrowings are not reported at fair value. Following the adoption of ASC 326, the population of loans measured at fair value on a non-recurring basis has greatly diminished and is limited to collateral-dependent loans evaluated individually. These collateral-dependent loans are deemed to be at fair value if there is an associated allowance for credit losses or if a charge-off has been recorded in the previous 12 months. Collateral values are determined using appraisals or other third-party value estimates of the subject property discounted based on estimated selling costs, generally between 6% and 10%, and immaterial adjustments for other external factors that may impact the marketability of the collateral. At December 31, 2020, the weighted average discount for estimated selling costs applied was 7.63%. Prior to the adoption of ACS 326, impaired loans were considered to be at fair value if an associated allowance adjustment or current period charge-off was recorded. The value of impaired loans is determined by either collateral valuations or discounted present value of the expected cash flow calculations. Collateral values are determined using appraisals or other third-party value estimates of the subject property with discounts generally between 6% and 11% applied for estimated selling costs and other external factors that may impact the marketability of the property. Expected cash flows are determined using expected payment information at the individual loan level, discounted using the effective interest rate. The effective interest rate for the majority of impaired loans generally ranged between 3% and 7%. OREO acquired or written down within the previous 12 months is deemed to be at fair value. Asset valuations are determined by using appraisals or other third-party value estimates of the subject property with with discounts, generally between 7% and 16%, applied for estimated selling costs and other external factors that may impact the marketability of the property. At December 31, 2020, the weighted average discount applied was 8.44%. Changes to the value of the assets between scheduled valuation dates are monitored through continued communication with brokers and monthly reviews by the asset manager assigned to each asset. If there are any significant changes in the market or the subject property, valuations are adjusted or new appraisals ordered to ensure the reported values reflect the most current information. Mortgage servicing rights are carried at the lower of cost or market and are, therefore, carried at fair value only when fair value is less than amortized cost. The fair value of mortgage servicing rights is performed using a pooling methodology. Similar loans are pooled together and a discounted cash flow model, which takes into consideration discount rates, prepayment rates, and the weighted average cost to service the loans, are used to determine the fair value. For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of December 31, 2020 and December 31, 2019. December 31, 2020 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Collateral-dependent loans 11,779 — — 11,779 Other real estate remeasured during the year 40,115 — — 40,115 Mortgage servicing rights 16,966 — — 16,966 December 31, 2019 Fair value measurements using: Fair value Level 1 Level 2 Level 3 Impaired loans $ 132,336 $ — $ — $ 132,336 Other real estate remeasured during the year 38,310 — — 38,310 Mortgage servicing rights 3,757 — — 3,757 No financial liabilities were carried at fair value on a nonrecurring basis as of December 31, 2020 and December 31, 2019.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2020
Retirement Benefits, Description [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS FCB sponsors benefit plans for its qualifying employees and former First Citizens Bancorporation, Inc. employees (“legacy Bancorporation”) including noncontributory defined benefit pension plans, a 401(k) savings plan and an enhanced 401(k) savings plan. These plans are qualified under the Internal Revenue Code. FCB also maintains agreements with certain executives providing supplemental benefits paid upon death or separation from service at an agreed-upon age. Defined Benefit Pension Plans BancShares employees who were hired prior to April 1, 2007 and qualified under length of service and other requirements are covered by the BancShares pension plan, which was closed to new participants as of April 1, 2007. Discretionary contributions of $80.0 million were made to the BancShares pension plan in 2020, while discretionary contributions of $71 thousand were made in 2019. Certain legacy Bancorporation employees who qualified under length of service and other requirements are covered by the legacy Bancorporation pension plan, which was closed to new participants as of September 1, 2007. Discretionary contributions of $20.0 million were made to the legacy Bancorporation pension plan for 2020, while discretionary contributions of $3.5 million were made for 2019. Participants in the noncontributory defined benefit pension plans (“the Plans”) were fully vested in the Plans after five years of service. Retirement benefits are based on years of service and highest annual compensation for five consecutive years during the last ten years of employment. FCB makes contributions to the Plans in amounts between the minimum required for funding and the maximum amount deductible for federal income tax purposes. Management evaluates the need for its pension plan contributions on a periodic basis based upon numerous factors including, but not limited to, the pension plan funded status, returns on plan assets, discount rates and the current economic environment. Due to the Plans having the same terms in both form and substance, the following tables and disclosures will report the Plans in total. Obligations and Funded Status The following table provides the changes in benefit obligation and plan assets and the funded status of the Plans at December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Change in benefit obligation Projected benefit obligation at January 1 $ 990,406 $ 852,975 Service cost 14,279 12,767 Interest cost 34,197 37,260 Actuarial losses 72,080 118,964 Benefits paid (33,309) (31,560) Projected benefit obligation at December 31 1,077,653 990,406 Change in plan assets Fair value of plan assets at January 1 976,072 842,534 Actual return on plan assets 192,792 161,506 Employer contributions 100,000 3,592 Benefits paid (33,309) (31,560) Fair value of plan assets at December 31 1,235,555 976,072 Funded status at December 31 $ 157,902 $ (14,334) The amount recognized in other assets at December 31, 2020 was $157.9 million. The amount recognized in other liabilities at December 31, 2019 was $14.3 million. The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Net actuarial loss $ 91,751 $ 172,098 The accumulated benefit obligation for the Plans at December 31, 2020 and 2019, was $985.0 million and $904.5 million, respectively. The Plans use a measurement date of December 31. The following table shows the components of periodic benefit cost related to the Plans and changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31, 2020, 2019 and 2018. Year ended December 31 (Dollars in thousands) 2020 2019 2018 Service cost $ 14,279 $ 12,767 $ 16,154 Interest cost 34,197 37,260 34,733 Expected return on assets (65,689) (62,590) (60,296) Amortization of prior service cost — 57 79 Amortization of net actuarial loss 25,324 10,924 13,902 Total net periodic benefit cost (income) 8,111 (1,582) 4,572 Current year actuarial (gain) loss (55,023) 20,049 32,012 Amortization of actuarial loss (25,324) (10,924) (13,902) Amortization of prior service cost — (57) (79) Net (gain) loss recognized in other comprehensive income (80,347) 9,068 18,031 Total recognized in net periodic benefit cost and other comprehensive income $ (72,236) $ 7,486 $ 22,603 Actuarial gains in 2020 were primarily driven by return on assets greater than expected, partially offset by the impact of a decreased discount rate. Service costs and the amortization of prior service costs are recorded in personnel expense, while interest cost, expected return on plan assets and the amortization of actuarial (gains)/losses are recorded in other noninterest expense. The assumptions used to determine the benefit obligations at December 31, 2020 and 2019 are as follows: 2020 2019 Discount rate 2.76 % 3.46 % Rate of compensation increase 5.60 5.60 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2020, 2019 and 2018, are as follows: 2020 2019 2018 Discount rate 3.46 % 4.38 % 3.76 % Rate of compensation increase 5.60 5.60 4.00 Expected long-term return on plan assets 7.50 7.50 7.50 The estimated discount rate, which represents the interest rate that could be obtained for a suitable investment used to fund the benefit obligations, is based on a yield curve developed from high-quality corporate bonds across a full maturity spectrum. The projected cash flows of the pension plans are discounted based on this yield curve and a single discount rate is calculated to achieve the same present value. The weighted average expected long-term rate of return on the Plans’ assets represents the average rate of return expected to be earned on the Plans’ assets over the period the benefits included in the benefit obligation are to be paid. In developing the expected rate of return, historical and current returns, as well as investment allocation strategies, on the Plans’ assets are considered. Plan Assets For the Plans, our primary total return objective is to achieve returns over the long term that will fund retirement liabilities and provide desired plan benefits in a manner that satisfies the fiduciary requirements of the Employee Retirement Income Security Act. The Plans’ assets have a long-term time horizon that runs concurrent with the average life expectancy of the participants. As such, the Plans can assume a time horizon that extends well beyond a full market cycle and can assume a reasonable level of risk. It is expected, however, that both professional investment management and sufficient portfolio diversification will smooth volatility and help generate a consistent level of return. The investments are broadly diversified across global, economic and market risk factors in an attempt to reduce volatility and target multiple return sources. Within approved guidelines and restrictions, the investment manager has discretion over the timing and selection of individual investments. The Plans’ assets are currently held by the FCB trust department. The fair values of pension plan assets at December 31, 2020 and 2019, by asset class are as follows: December 31, 2020 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 37,913 $ 37,913 — — 0 - 5% 3 % Equity securities 30 - 70% 77 % Common and preferred stock 144,924 144,924 — — Mutual funds 559,472 559,472 — — Exchange traded funds 248,819 248,819 — — Fixed income 15 - 45% 20 % U.S. government and government agency securities 90,292 — 90,292 — Corporate bonds 154,135 — 154,135 — Total pension assets $ 1,235,555 $ 991,128 $ 244,427 $ — 100 % December 31, 2019 Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 10,974 $ 10,974 $ — $ — 0 - 5% 1 % Equity securities 30 - 70% 73 % Common and preferred stock 142,157 142,157 — — Mutual funds 565,343 565,343 — — Fixed income 15 - 45% 23 % U.S. government and government agency securities 78,175 — 78,175 — Corporate bonds 122,370 — 122,370 — Mutual funds 25,288 25,288 — — Alternative investments 0 - 30% 3 % Mutual funds 31,765 31,765 — — Total pension assets $ 976,072 $ 775,527 $ 200,545 $ — 100 % Cash Flows The following are estimated payments to pension plan participants in the indicated periods: (Dollars in thousands) Estimated Payments 2021 $ 38,660 2022 41,340 2023 43,777 2024 46,161 2025 48,343 2026-2030 269,256 401(k) Savings Plans Certain employees enrolled in the defined benefit plan are also eligible to participate in a 401(k) savings plan through deferral of portions of their salary. For employees who participate in the 401(k) savings plan who also continue to accrue additional years of service under the defined benefit plan, FCB makes a matching contribution equal to 100% of the first 3% and 50% of the next 3% of the participant’s deferral up to and including a maximum contribution of 4.5% of the participant’s eligible compensation. The matching contribution immediately vests. At the end of 2007, current employees were given the option to continue to accrue additional years of service under the defined benefit plans or to elect to join an enhanced 401(k) savings plan. Under the enhanced 401(k) savings plan, FCB matches up to 100% of the participant’s deferrals not to exceed 6% of the participant’s eligible compensation. The matching contribution immediately vests. In addition to the employer match of the employee contributions, the enhanced 401(k) savings plan provides a required employer non-elective contribution equal to 3% of the compensation of a participant who remains employed at the end of the calendar year. This employer contribution vests after three years of service. Employees who elected to enroll in the enhanced 401(k) savings plan discontinued the accrual of additional years of service under the defined benefit plans and became enrolled in the enhanced 401(k) savings plan effective January 1, 2008. Eligible employees hired after January 1, 2008, are eligible to participate in the enhanced 401(k) savings plan. FCB recognized expense related to contributions to the 401(k) plans of $35.6 million, $30.8 million and $28.6 million during 2020, 2019 and 2018, respectively. Additional Benefits for Executives, Directors, and Officers FCB has entered into contractual agreements with certain executives providing payments for a period of no more than ten years following separation from service occurring no earlier than an agreed-upon age. These agreements also provide a death benefit in the event a participant dies prior to separation from service or during the payment period following separation from service. FCB has also assumed liability for contractual obligations to directors and officers of previously acquired entities. The following table provides the accrued liability as of December 31, 2020 and 2019, and the changes in the accrued liability during the years then ended: (Dollars in thousands) 2020 2019 Accrued liability as of January 1 $ 45,295 $ 34,063 Liability assumed in the Biscayne Bancshares acquisition — 1,138 Liability assumed in the First South Bancorp acquisition — 1,067 Liability assumed in the Entegra acquisition — 9,738 Discount rate adjustment 1,719 1,574 Benefit expense and interest cost 3,503 2,396 Benefits paid (7,862) (4,681) Accrued liability as of December 31 $ 42,655 $ 45,295 Discount rate at December 31 2.76 % 3.46 % Other Compensation Plans FCB offers various short-term and long-term incentive plans for certain employees. Compensation awarded under these plans may be based on defined formulas, performance criteria, or at the discretion of management. The incentive compensation programs were designed to motivate employees through a balanced approach of risk and reward for their contributions toward FCB’s success. As of December 31, 2020 and 2019, the accrued liability for incentive compensation was $68.2 million and $57.0 million, respectively.

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	LEASES The following table presents lease assets and liabilities as of December 31, 2020 and 2019: (Dollars in thousands) Classification December 31, 2020 December 31, 2019 Assets: Operating Other assets $ 68,048 $ 77,115 Finance Premises and equipment 6,478 8,820 Total leased assets $ 74,526 $ 85,935 Liabilities: Operating Other liabilities $ 68,343 $ 76,746 Finance Other borrowings 6,308 8,230 Total lease liabilities $ 74,651 $ 84,976 The following table presents lease costs for the years ended December 31, 2020 and 2019. Variable lease cost primarily represents variable payments such as common area maintenance and utilities recognized in the period in which the expense was incurred. Certain of our lease agreements also include rental payments adjusted periodically for inflation. While lease liabilities are not remeasured as a result of these changes, these adjustments are treated as variable lease costs and recognized in the period in which the expense is incurred. (Dollars in thousands) Classification 2020 2019 Lease cost: Operating lease cost (1) Occupancy expense $ 15,023 $ 16,094 Finance lease cost: Amortization of leased assets Equipment expense 2,168 1,975 Interest on lease liabilities Interest expense - Other borrowings 220 259 Variable lease cost Occupancy expense 3,231 2,394 Sublease income Occupancy expense (350) (390) Net lease cost $ 20,292 $ 20,332 (1) Operating lease cost includes short-term lease cost, which is immaterial. The following table presents lease liability maturities in the next five years and thereafter: (Dollars in thousands) Operating Leases Finance Leases Total 2020 $ 12,865 $ 2,159 $ 15,024 2021 11,757 1,876 13,633 2022 9,980 993 10,973 2023 8,146 617 8,763 2024 5,223 635 5,858 Thereafter 32,045 431 32,476 Total lease payments $ 80,016 $ 6,711 $ 86,727 Less: Interest 11,673 403 12,076 Present value of lease liabilities $ 68,343 $ 6,308 $ 74,651 The following table presents the remaining weighted average lease terms and discount rates as of December 31, 2020: Weighted average remaining lease term (years): December 31, 2020 Operating 9.2 Finance 4.0 Weighted average discount rate: Operating 3.14 % Finance 3.08 The following table presents supplemental cash flow information related to leases for the years ended December 31, 2020 and 2019: Year ended December 31 (Dollars in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 14,237 $ 15,703 Operating cash flows from finance leases 220 259 Financing cash flows from finance leases 1,922 1,850 Right-of-use assets obtained in exchange for new operating lease liabilities 4,595 17,837 Right-of-use assets obtained in exchange for new finance lease liabilities — 1,886
Leases	LEASES The following table presents lease assets and liabilities as of December 31, 2020 and 2019: (Dollars in thousands) Classification December 31, 2020 December 31, 2019 Assets: Operating Other assets $ 68,048 $ 77,115 Finance Premises and equipment 6,478 8,820 Total leased assets $ 74,526 $ 85,935 Liabilities: Operating Other liabilities $ 68,343 $ 76,746 Finance Other borrowings 6,308 8,230 Total lease liabilities $ 74,651 $ 84,976 The following table presents lease costs for the years ended December 31, 2020 and 2019. Variable lease cost primarily represents variable payments such as common area maintenance and utilities recognized in the period in which the expense was incurred. Certain of our lease agreements also include rental payments adjusted periodically for inflation. While lease liabilities are not remeasured as a result of these changes, these adjustments are treated as variable lease costs and recognized in the period in which the expense is incurred. (Dollars in thousands) Classification 2020 2019 Lease cost: Operating lease cost (1) Occupancy expense $ 15,023 $ 16,094 Finance lease cost: Amortization of leased assets Equipment expense 2,168 1,975 Interest on lease liabilities Interest expense - Other borrowings 220 259 Variable lease cost Occupancy expense 3,231 2,394 Sublease income Occupancy expense (350) (390) Net lease cost $ 20,292 $ 20,332 (1) Operating lease cost includes short-term lease cost, which is immaterial. The following table presents lease liability maturities in the next five years and thereafter: (Dollars in thousands) Operating Leases Finance Leases Total 2020 $ 12,865 $ 2,159 $ 15,024 2021 11,757 1,876 13,633 2022 9,980 993 10,973 2023 8,146 617 8,763 2024 5,223 635 5,858 Thereafter 32,045 431 32,476 Total lease payments $ 80,016 $ 6,711 $ 86,727 Less: Interest 11,673 403 12,076 Present value of lease liabilities $ 68,343 $ 6,308 $ 74,651 The following table presents the remaining weighted average lease terms and discount rates as of December 31, 2020: Weighted average remaining lease term (years): December 31, 2020 Operating 9.2 Finance 4.0 Weighted average discount rate: Operating 3.14 % Finance 3.08 The following table presents supplemental cash flow information related to leases for the years ended December 31, 2020 and 2019: Year ended December 31 (Dollars in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 14,237 $ 15,703 Operating cash flows from finance leases 220 259 Financing cash flows from finance leases 1,922 1,850 Right-of-use assets obtained in exchange for new operating lease liabilities 4,595 17,837 Right-of-use assets obtained in exchange for new finance lease liabilities — 1,886

Transactions with Related Perso

Transactions with Related Persons	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Transactions with related persons	TRANSACTIONS WITH RELATED PERSONS BancShares has, and expects to have in the future, banking transactions in the ordinary course of business with directors, officers and their associates (“Related Persons”) and entities controlled by Related Persons. For those identified as Related Persons as of December 31, 2020, the following table provides an analysis of changes in the loans outstanding during 2020 and 2019: Year ended December 31 (dollars in thousands) 2020 2019 Balance at January 1 $ 145 $ 199 New loans 19 5 Repayments (47) (59) Balance at December 31 $ 117 $ 145 The amounts presented exclude loans to Related Persons for credit card lines of $15,000 or less, overdraft lines of $5,000 or less and intercompany transactions between BancShares and FCB. Unfunded loan commitments available to Related Persons were $2.6 million as of December 31, 2020 and 2019. During the years ended December 31, 2020 and 2019, BancShares repurchased 45,000 and 100,000 shares, respectively, of its outstanding Class A common stock from Ella Anna Holding, as trustee of her revocable trust. Mrs. Holding is the widow of BancShares’ former Executive Vice Chairman, Frank B. Holding, and the mother of Frank B. Holding, Jr. and Hope H. Bryant, BancShares’ Chairman and Chief Executive Officer and Vice Chairman, respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES To meet the financing needs of its customers, BancShares and its subsidiaries have financial instruments with off-balance sheet risk. These financial instruments include commitments to extend credit and standby letters of credit. These instruments involve elements of credit, interest rate or liquidity risk. Commitments to extend credit are legally binding agreements to lend to customers. These commitments generally have fixed expiration dates or other termination clauses and may require payment of fees. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future liquidity requirements. Established credit standards control the credit risk exposure associated with these commitments. In some cases, BancShares requires collateral be pledged to secure the commitment, including cash deposits, securities and other assets. Standby letters of credit are commitments guaranteeing performance of a customer to a third party. These commitments are primarily issued to support public and private borrowing arrangements, and their fair value is not material. To mitigate its risk, BancShares’ credit policies govern the issuance of standby letters of credit. The credit risk related to the issuance of these letters of credit is essentially the same as those involved in extending loans to clients and, therefore, these letters of credit are collateralized when necessary. The following table presents the commitments to extend credit and unfunded commitments as of December 31, 2020 and 2019: (Dollars in thousands) 2020 2019 Unused commitments to extend credit $ 12,098,417 $ 10,682,378 Standby letters of credit 129,819 99,601 BancShares and FCB have investments in qualified affordable housing projects primarily for the purposes of fulfilling Community Reinvestment Act requirements and obtaining tax credits. Unfunded commitments to fund future investments in affordable housing projects totaled $53.7 million and $70.0 million as of December 31, 2020 and 2019, respectively, and were recorded within other liabilities. BancShares and various subsidiaries have been named as defendants in legal actions arising from their normal business activities in which damages in various amounts are claimed. BancShares is also exposed to litigation risk relating to the prior business activities of banks from which assets were acquired and liabilities assumed in merger transactions. Although the amount of any ultimate liability with respect to such matters cannot be determined, in the opinion of management, any such liability will not have a material effect on BancShares’ consolidated financial statements.

Parent Company Financial Statem

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Parent Company Financial Statements	PARENT COMPANY FINANCIAL STATEMENTS Parent Company Condensed Balance Sheets (Dollars in thousands) December 31, 2020 December 31, 2019 Assets Cash and due from banks $ 49,716 $ 4,573 Overnight investments 1,607 2,547 Investments in marketable equity securities 91,680 82,333 Investment securities available for sale 2,010 3,015 Investment in banking subsidiaries 4,621,676 3,763,947 Investment in other subsidiaries 3,241 3,555 Due from subsidiaries 786 — Other assets 48,591 45,164 Total assets $ 4,819,307 $ 3,905,134 Liabilities and Shareholders’ Equity Subordinated debentures $ 452,350 $ 105,677 Other borrowings 128,125 201,702 Due to subsidiaries — 1,670 Other liabilities 9,564 9,901 Shareholders’ equity 4,229,268 3,586,184 Total liabilities and shareholders’ equity $ 4,819,307 $ 3,905,134 Parent Company Condensed Income Statements Year ended December 31 (Dollars in thousands) 2020 2019 2018 Interest and dividend income $ 3,952 $ 1,327 $ 1,362 Interest expense 16,817 7,187 5,154 Net interest loss (12,865) (5,860) (3,792) Dividends from banking subsidiaries 229,685 149,819 242,910 Marketable equity securities gains (losses), net 29,395 20,625 (7,610) Other income 574 257 347 Other operating expense 13,168 9,497 11,127 Income before income tax benefit and equity in undistributed net income of subsidiaries 233,621 155,344 220,728 Income tax expense (benefit) 879 892 (5,184) Income before equity in undistributed net income of subsidiaries 232,742 154,452 225,912 Equity in undistributed net income of subsidiaries 258,981 302,919 174,401 Net income 491,723 457,371 400,313 Less: Preferred stock dividends 14,062 — — Net income available to common shareholders $ 477,661 $ 457,371 $ 400,313 Parent Company Condensed Statements of Cash Flows Year ended December 31 (Dollars in thousands) 2020 2019 2018 OPERATING ACTIVITIES Net income $ 491,723 $ 457,371 $ 400,313 Adjustments Undistributed net income of subsidiaries (258,981) (302,919) (174,401) Net amortization of premiums and discounts 824 119 88 Marketable equity securities (gains) losses, net (29,395) (20,625) 7,610 Gain on extinguishment of debt — — (160) Realized gains (losses) on investment securities available for sale, net — (20) — Net change in due to/from subsidiaries (2,456) (2,185) (381) Change in other assets (3,074) (2,001) 3,657 Change in other liabilities (694) 981 (2,595) Net cash provided by operating activities 197,947 130,721 234,131 INVESTING ACTIVITIES Net change in loans — 100,000 (100,000) Net change in overnight investments 940 2,162 14,091 Purchases of marketable equity securities (333,140) (26,166) (2,818) Proceeds from sales of marketable equity securities 352,835 56,749 9,528 Purchases of investment securities — — (6,438) Proceeds from sales, calls, and maturities of securities 1,000 3,477 9,997 Investment in subsidiaries (422,500) — — Net cash provided by (used in) investing activities (400,865) 136,222 (75,640) FINANCING ACTIVITIES Net change in short-term borrowings (40,277) 40,277 (15,000) Repayment of long-term obligations (33,300) (3,575) (1,840) Origination of long-term obligations — 165,000 — Net proceeds from subordinated notes issuance 345,849 — — Net proceeds from preferred stock issuance 339,937 — — Repurchase of common stock (333,755) (453,123) (163,095) Cash dividends paid (30,393) (18,137) (16,779) Net cash provided by (used in) financing activities 248,061 (269,558) (196,714) Net change in cash 45,143 (2,615) (38,223) Cash balance at beginning of year 4,573 7,188 45,411 Cash balance at end of year $ 49,716 $ 4,573 $ 7,188 CASH PAYMENTS FOR: Interest $ 13,338 $ 7,187 $ 5,154 Income taxes 106,618 78,345 73,806

Accounting Policies and Basis_2

Accounting Policies and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations First Citizens BancShares, Inc. (“we,” “us,” “our,” “BancShares,”) is a financial holding company organized under the laws of Delaware and conducts operations through its banking subsidiary, First-Citizens Bank & Trust Company (“FCB,” or “the Bank”), which is headquartered in Raleigh, North Carolina. BancShares and its subsidiaries operate 542 branches in 19 states predominantly located in the Southeast, Mid-Atlantic, Midwest and Western United States (the “U.S.”). BancShares seeks to meet the financial needs of individuals and commercial entities in its market areas through a wide range of retail and commercial banking services. Loan services include various types of commercial, business and consumer lending. Deposit services include checking, savings, money market and time deposit accounts. First Citizens Wealth Management provides holistic, goals-based advisory services encompassing a broad range of client deliverables. These deliverables include wealth planning, discretionary investment advisory services, insurance, brokerage, defined benefit and defined contribution services, private banking, trust, fiduciary, philanthropy and special asset services.
Principles of Consolidation and Segment Reporting	Principles of Consolidation and Basis of Presentation The accounting and reporting policies of BancShares and its subsidiaries are in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and general practices within the banking industry. The consolidated financial statements of BancShares include the accounts of BancShares and its subsidiaries, certain partnership interests and variable interest entities. All significant intercompany accounts and transactions are eliminated upon consolidation. BancShares operates with centralized management and combined reporting; thus, BancShares operates as one consolidated reportable segment. Variable interest entities (“VIE”) are legal entities that either do not have sufficient equity to finance their activities without the support from other parties or whose equity investors lack a controlling financial interest. FCB has investments in certain partnerships and limited liability entities that have been evaluated and determined to be VIEs. Consolidation of a VIE is appropriate if a reporting entity holds a controlling financial interest in the VIE and is the primary beneficiary. FCB is not the primary beneficiary and does not hold a controlling interest in the VIEs as it does not have the power to direct the activities that most significantly impact the VIEs’ economic performance. As such, assets and liabilities of these entities are not consolidated into the financial statements of BancShares. The recorded investment in these entities is reported within other assets.
Reclassifications	Reclassifications In certain instances, amounts reported in prior years’ consolidated financial statements have been reclassified to conform to the current financial statement presentation. Such reclassifications had no effect on previously reported shareholders’ equity or net income.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial StatementsThe preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions impacting the amounts reported. Actual results could differ from those estimates. The estimates BancShares considers significant are the allowance for credit losses, fair value measurements, and income taxes.
Business Combinations	Business Combinations BancShares accounts for all business combinations using the acquisition method of accounting. Under this method, acquired assets and assumed liabilities are included with the acquirer’s accounts as of the date of acquisition, with any excess of purchase price over the fair value of the net assets acquired recognized as either finite lived intangibles or capitalized as goodwill. In addition, acquisition-related and restructuring costs are recognized as period expenses as incurred. See Note B, Business Combinations, for additional information.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash and due from banks, interest-bearing deposits with banks and federal funds sold. Cash and cash equivalents have initial maturities of three months or less. The carrying value of cash and cash equivalents approximates its fair value due to its short-term nature.
Investment Securities	Debt Securities BancShares classifies debt securities as held to maturity (“HTM”) or available for sale (“AFS”). Debt securities are classified as HTM when BancShares has the intent and ability to hold the securities to maturity. HTM securities are reported at amortized cost. Other debt securities are classified as AFS and reported at estimated fair value, with unrealized gains and losses, net of income taxes, reported in Accumulated Other Comprehensive Income (“AOCI”). Amortization of premiums and accretion of discounts for debt securities are recorded in interest income. Realized gains and losses from the sale of debt securities are determined by specific identification on a trade date basis and are included in noninterest income. BancShares performs pre-purchase due diligence and evaluates the credit risk of AFS and HTM debt securities purchased directly into our portfolio or via acquisition. If securities have evidence of more than insignificant credit deterioration since issuance, they are designated as purchased credit deteriorated (“PCD”). P CD debt securities are recorded at fair value at the date of acquisition, which includes an associated allowance for credit losses (“ACL”) that is added to the purchase price or fair value to arrive at the Day 1 amortized cost basis. Excluding the ACL, the difference between the purchase price and the Day 1 amortized cost is amortized or accreted to interest income over the contractual life of the securities using the effective interest method. For AFS debt securities, management performs a quarterly analysis of the investment portfolio to evaluate securities currently in an unrealized loss position for potential credit-related impairment. If BancShares intends to sell a security, or does not have the intent and ability to hold a security before recovering the amortized cost, the entirety of the unrealized loss is immediately recorded in earnings. For the remaining securities, an analysis is performed to determine if any portion of the unrealized loss recorded relates to credit impairment. If credit-related impairment exists, the amount is recorded through the ACL and related provision. This review includes indicators such as changes in credit rating, delinquency, bankruptcy or other significant news event impacting the issuer. BancShares’ portfolio of HTM debt securities is made up of mortgage-backed securities issued by government agencies and government sponsored entities. Given the historically strong credit rating of the U.S. Treasury and the long history of no credit losses on debt securities issued by government agencies and government sponsored entities, we determined zero expected credit losses on the HTM portfolio. Equity Securities Equity securities are recorded on a trade date basis and measured at fair value. Realized and unrealized gains and losses are determined by specific identification and are included in noninterest income. Non-marketable equity securities are securities with no readily determinable fair values and are measured at cost. BancShares evaluates its non-marketable equity securities for impairment and recoverability of the recorded investment by considering positive and negative evidence, including the profitability and asset quality of the issuer, dividend payment history and recent redemption experience. Impairment is assessed at each reporting period and if identified, is recognized in noninterest expense. Non-marketable equity securities were $11.6 million and $12.5 million at December 31, 2020 and 2019, respectively, and are included in other assets. Other Securities Membership in the Federal Home Loan Bank (“FHLB”) network requires ownership of FHLB restricted stock. This stock is restricted as it may only be sold to the FHLB and all sales must be at par. Accordingly, the FHLB restricted stock is carried at cost, less any applicable impairment charges and is recorded within other assets. FHLB restricted stock was $45.4 million and $43.0 million at December 31, 2020 and 2019, respectively. Additionally, BancShares holds approximately 354,000 shares of Visa Class B common stock. Visa Class B shares are not considered to have a readily determinable fair value and are recorded at $0. Investments in Qualified Affordable Housing Projects
Loans Held For Sale	Loans Held For SaleBancShares elected to apply the fair value option for residential mortgage loans originated to be sold to investors. Gains and losses on sales of mortgage loans are recognized within mortgage income.
Loans and Leases	Loans and Leases BancShares’ accounting methods for loans and leases depends on whether they are originated or purchased, and if purchased, whether or not the loans reflect more than insignificant credit deterioration since origination as of the date of acquisition. Non-Purchased Credit Deteriorated Loans Non-Purchased Credit Deteriorated (“Non-PCD”) loans consist of loans originated by BancShares and loans purchased from other institutions that do not reflect more than insignificant credit deterioration at acquisition. Originated loans for which management has the intent and ability to hold for the foreseeable future are classified as held for investment and carried at the principal amount outstanding net of any unearned income, charge-offs and unamortized fees and costs. Nonrefundable fees collected and certain direct costs incurred related to loan originations are deferred and recorded as an adjustment to loans outstanding. The net amount of the nonrefundable fees and costs is amortized to interest income over the contractual lives using methods that approximate a constant yield. Purchased loans which do not reflect more than insignificant credit deterioration at acquisition are classified as non-PCD loans. These loans are recorded at fair value at the date of acquisition and an initial allowance is recorded on these assets as provision expense at the date of acquisition. The difference between the fair value and the unpaid principal balance at the acquisition date is amortized or accreted to interest income over the contractual life of the loan using the effective interest method. Purchased Credit Deteriorated Loans Purchased loans which reflect a more than insignificant credit deterioration since origination as of the date of acquisition are classified as PCD and are recorded at acquisition-date amortized cost, which is the purchase price or fair value in a business combination, plus our initial ACL. Excluding the ACL, the difference between the unpaid principal balance and the acquisition date amortized cost is amortized or accreted to interest income over the contractual life of the loan using the effective interest method. The performance of all loans within the BancShares portfolio is subject to a number of external risks, including but not limited to changes in the overall health of the economy, declines in real estate or other collateral values, changes in the demand for products and services and personal events, such as death, disability or change in marital status. BancShares evaluates and reports its non-PCD and PCD loan portfolios separately, and each non-PCD portfolio is further divided into commercial and consumer segments based on the type of borrower, purpose, collateral and/or our underlying credit management processes. Additionally, non-PCD commercial and consumer loans are assigned to loan classes, which further disaggregate the loan portfolio. PCD loans are reported as a single loan segment and class. Upon adoption of Accounting Standard Codification (“ASC”) 326, owner occupied and non-owner occupied commercial real estate were segregated into separate classes within the commercial segment. Similarly, consumer auto was segregated into its own class within the consumer segment. These enhancements were made to capture the unique credit characteristics used in our current expected credit loss (“CECL”) models. Information for reporting periods beginning after January 1, 2020 are presented in accordance with ASC 326 and reflect changes to the respective classes, while prior period amounts continue to be reported in accordance with previously applicable GAAP and have not been reclassified to conform to the current financial statement presentation. Small Business Administration Paycheck Protection Program The Small Business Administration Paycheck Protection Program (“SBA-PPP”) is one of the centerpieces of the Coronavirus Aid Relief and Economic Security Act (the “CARES Act”), which was passed on March 27, 2020 in response to the outbreak of coronavirus (“COVID-19”) and was supplemented with subsequent legislation. Overseen by the U.S. Treasury Department, the SBA-PPP offered cash-flow assistance to nonprofit and small business employers through guaranteed loans for expenses incurred between February 15, 2020, and August 8, 2020. Borrowers are eligible for forgiveness of principal and accrued interest on SBA-PPP loans to the extent that the proceeds were used to cover eligible payroll costs, interest costs, rent, and utility costs over a period of between eight and 24-weeks after the loan was made as long as the borrower retains its employees and their compensation levels. The CARES Act authorized the SBA to temporarily guarantee these loans. The SBA began processing forgiveness payments during the fourth quarter of 2020. The Consolidated Apportions Act 2021 was signed into law during the fourth quarter of 2020 and contained provisions for new funding of SBA-PPP loans. We began accepting applications for this round of funding beginning in the first quarter of 2021. Due to the unique nature of these provisions, SBA-PPP loans have been disclosed as a separate loan class. Origination fees received from the SBA are capitalized into the carrying amount of the loans. The deferred fee income, net of origination costs, is recognized over the life of the loan as an adjustment to yield using the effective interest method. The following represent our classes of loans as of January 1, 2020 upon adoption of ASC 326 (with the exception of SBA-PPP, which was added during second quarter 2020): Commercial loans and leases Construction and land development - Construction and land development consists of loans to finance land for commercial development of real property and construction of multifamily apartments or other commercial properties. These loans are highly dependent on the supply and demand for commercial real estate as well as the demand for newly constructed residential homes and lots acquired for development. Deterioration in demand could result in decreased collateral values, which could make repayments of outstanding loans difficult for customers. Owner occupied commercial mortgage - Owner occupied commercial mortgages consists of loans to purchase or refinance owner occupied nonresidential properties. This includes office buildings, other commercial facilities and farmland. Commercial mortgages secured by owner occupied properties are primarily dependent on the ability of borrowers to achieve business results consistent with those projected at loan origination. While these loans and leases are collateralized by real property in an effort to mitigate risk, it is possible the liquidation of collateral will not fully satisfy the obligation. Non-owner occupied commercial mortgage - Non-owner occupied commercial mortgage consists of loans to purchase or refinance investment nonresidential properties. This includes office buildings and other facilities rented or leased to unrelated parties, as well as farmland and multifamily properties. The primary risk associated with income producing commercial mortgage loans is the ability of the income-producing property that collateralizes the loan to produce adequate cash flow to service the debt. While these loans and leases are collateralized by real property in an effort to mitigate risk, it is possible the liquidation of collateral will not fully satisfy the obligation. Commercial and industrial and leases - Commercial and industrial loans consist of loans or lines of credit to finance accounts receivable, inventory or other general business needs, business credit cards, and lease financing agreements for equipment, vehicles, or other assets. The primary risk associated with commercial and industrial and lease financing loans is the ability of borrowers to achieve business results consistent with those projected at origination. Failure to achieve these projections presents risk the borrower will be unable to service the debt consistent with the contractual terms of the loan or lease. SBA-PPP - These loans were originated as part of the SBA-PPP to finance payroll and other costs for nonprofit and small businesses impacted by the COVID-19 pandemic. These loans are guaranteed by the SBA and borrowers have the ability to qualify for loan forgiveness through the U.S. Treasury. Consumer loans Residential mortgage - Residential mortgage consists of loans to purchase or refinance the borrower’s primary dwelling, secondary residence or vacation home and are often secured by 1-4 family residential properties. Significant and rapid declines in real estate values can result in borrowers having debt levels in excess of the current market value of the collateral. Revolving mortgage - Revolving mortgage consists of home equity lines of credit and other lines of credit or loans secured by first or second liens on the borrower’s primary residence. These loans are secured by both senior and junior liens on the residential real estate and are particularly susceptible to declining collateral values. This risk is elevated for loans secured by junior lines as a substantial decline in value could render the junior lien position effectively unsecured. Construction and land development - Construction and land development consists of loans to construct a borrower’s primary or secondary residence or vacant land upon which the owner intends to construct a dwelling at a future date. These loans are typically secured by undeveloped or partially developed land in anticipation of completing construction of a 1-4 family residential property. There is risk these construction and development projects can experience delays and cost overruns exceeding the borrower’s financial ability to complete the project. Such cost overruns can result in foreclosure of partially completed and unmarketable collateral. Consumer auto loans - Consumer auto loans consist of installment loans to finance purchases of vehicles. These loans include direct auto loans originated in bank branches, as well indirect auto loans originated through agreements with auto dealerships. The value of the underlying collateral within this class is at risk of potential rapid depreciation which could result in unpaid balances in excess of the collateral. Other consumer - Other consumer loans consist of loans to finance unsecured home improvements, student loans and revolving lines of credit that can be secured or unsecured, including personal credit cards. The value of the underlying collateral within this class is at risk of potential rapid depreciation which could result in unpaid balances in excess of the collateral. Loans and Leases - (Prior to Adoption of ASC 326) Prior to the adoption of ASC 326, BancShares’ accounting methods for loans and leases depended on whether they were originated or purchased, and if purchased, whether or not the loans reflected credit deterioration at the date of acquisition. Non-Purchased Credit Impaired (“Non-PCI”) Loans Non-PCI loans consisted of loans originated by BancShares or loans purchased from other institutions that did not reflect credit deterioration at acquisition. Originated loans for which management had the intent and ability to hold for the foreseeable future were classified as held for investment and carried at the principal amount outstanding net of any unearned income, charge-offs and unamortized fees and costs. Nonrefundable fees collected and certain direct costs incurred related to loan originations were deferred and recorded as an adjustment to loans outstanding. The net amount of the nonrefundable fees and costs was amortized to interest income over the contractual lives using methods that approximated a constant yield. Purchased loans which did not reflect credit deterioration at acquisition were classified as non-PCI loans. These loans were recorded at fair value at the date of acquisition. The difference between the fair value and the unpaid principal balance at the acquisition date was amortized or accreted to interest income over the contractual life of the loan using the effective interest method. Purchased Credit Impaired (“PCI”) Loans Purchased loans which reflected credit deterioration since origination, such that it was probable at acquisition that BancShares would be unable to collect all contractually required payments, were classified as PCI loans. PCI loans were recorded at fair value at the date of acquisition. If the timing and amount of the future cash flows could be reasonably estimated, any excess of cash flows expected at acquisition over the estimated fair value were recognized as interest income over the life of the loans using the effective yield method. Subsequent to the acquisition date, increases in cash flows over those expected at the acquisition date were recognized prospectively as interest income. Decreases in expected cash flows due to credit deterioration were recognized by recording an allowance for loan losses. In the event of prepayment, the remaining unamortized amount was recognized in interest income. To the extent possible, PCI loans were aggregated into pools based upon common risk characteristics and each pool was accounted for as a single unit. The performance of all loans within the BancShares portfolio was subject to a number of external risks, including changes in the overall health of the economy, declines in real estate values, changes in the demand for products and services and personal events, such as death, disability or change in marital status. BancShares evaluated and reported its non-PCI and PCI loan portfolios separately, and each portfolio was further divided into commercial and non-commercial segments based on the type of borrower, purpose, collateral and/or our underlying credit management processes.
Impaired Loans, Troubled Debt Restructurings (TDR) and Nonperforming Assets	Nonperforming Assets and Troubled Debt Restructurings Nonperforming Assets Nonperforming assets (“NPAs”) include nonaccrual loans, past due debt securities and other real estate owned. All loans are classified as past due when the payment of principal and interest based upon contractual terms is 30 days or greater delinquent. Loans are generally placed on nonaccrual when principal or interest becomes 90 days past due or when it is probable the principal or interest is not fully collectible. When loans are placed on nonaccrual, all previously uncollected accrued interest is reversed from interest income and the ongoing accrual of interest is discontinued. All payments received thereafter are applied as a reduction of the remaining principal balance as long as doubt exists as to the ultimate collection of the principal. Loans and leases are generally removed from nonaccrual status when they become current for a sustained period of time and there is no longer concern as to the collectability of principal and interest. Debt securities are also classified as past due when the payment of principal and interest based upon contractual terms is 30 days delinquent or greater. Missed interest payments on debt securities are rare. We review all debt securities with delinquent interest and immediately charge off any accrued interest determined to be uncollectible. Troubled Debt Restructurings A loan is considered a troubled debt restructuring (“TDR”) when both a modification to a borrower’s debt agreement is made and a concession is granted for economic or legal reasons related to a borrower’s financial difficulties that otherwise would not be granted. TDR concessions could include short-term deferrals of interest, modifications of payment terms or, in certain limited instances, forgiveness of principal or interest. Loans restructured as a TDR are treated and reported as such for the remaining life of the loan. TDR loans can be nonaccrual or accrual, depending on the individual facts and circumstances of the borrower. In circumstances where a portion of the loan balance is charged-off, the remaining balance is typically classified as nonaccrual.
Credit Loss, Financial Instrument	Allowance for Credit Losses Loans Loans within the various reporting classes are segregated into pools with similar risk characteristics and models are built to estimate the ACL. These loan level ACL models estimate the probability of default and loss given default for individual loans within the risk pool based on historical loss experience, borrower characteristics, collateral type, forecasts of relevant economic conditions, expected future recoveries and other factors. Pools for estimating the ACL are aggregated into loan classes, as described above, which roll up into commercial and consumer loan segments. Non-PCD and PCD loans are modeled together within the loan level models using acquired and PCD indicator variables to provide differentiation of individual loan risk. BancShares uses a two The ACL for SBA-PPP loans originated during 2020 are separately evaluated given the explicit government guarantee. This analysis, which incorporated historical experience with similar SBA guarantees and underwriting, concluded the likelihood of loss was remote and therefore these loans were assigned a zero expected credit loss in the ACL. The ACL represents management’s best estimate of credit losses expected over the life of the loan, adjusted for expected contractual payments and the impact of prepayment expectations. Prepayment assumptions were developed through a review of BancShares’ historical prepayment activity and began with a review of prepayment assumptions utilized in other modeling activities. Estimates for loan losses are determined by analyzing quantitative and qualitative components present as of the evaluation date. Adjustments to the ACL are recorded with a corresponding entry to provision for credit losses. Loan balances considered uncollectible are charged-off against the ACL. Recoveries of amounts previously charged-off are credited to the ACL. A primary component of determining the ACL on loans is the actual net loss history of the various loan pools. For commercial pools, key factors utilized in the models include delinquency trends as well as macroeconomic variables such as unemployment and commercial real estate price index. For consumer pools, key factors include delinquency trends and the borrower’s original credit score, as well as other macroeconomic variables such as unemployment, gross domestic product, home price index, and commercial real estate index. As the models project losses over the life of the loans, prepayment assumptions also serve as inputs. Model outputs may be adjusted through a qualitative assessment to reflect economic conditions and trends not captured within the models including credit quality, concentrations, and significant policy and underwriting changes. Within our ACL model, TDRs meet the definition of default and are given a 100% probability of default rating. TDRs are not individually evaluated unless determined to be collateral-dependent. Therefore, loss given default is calculated based on the individual risk characteristics of the loan as defined in the model. When loans do not share risk characteristics similar to others in the pool, the ACL is evaluated on an individual basis. Given that BancShares' CECL models are loan level models, the population of loans evaluated individually is minimal and consists primarily of loans greater than $500 thousand and determined to be collateral-dependent. BancShares elected the practical expedient allowed under ASC 326 to assess the collectability of these loans, where repayment is expected to be provided substantially through operation or sale of collateral, based on the fair value of the underlying collateral. The fair value of the collateral is estimated using appraised and market values (appropriately adjusted for an assessment of the sales and marketing costs when applicable). A specific allowance is established, or partial charge-off is recorded, for the difference between the excess amortized cost of loan and the collateral’s estimated fair value. Accrued Interest Receivable
Reserve for Unfunded Commitments	Unfunded Commitments A reserve for unfunded commitments is established for off-balance sheet exposures such as unfunded balances for existing lines of credit, commitments to extend future credit, as well as both standby and commercial letters of credit when there is a contractual obligation to extend credit and when this extension of credit is not unconditionally cancellable (i.e. commitment cannot be canceled at any time). These unfunded commitments are assessed to determine both the probability of funding as well the expectation of future losses. The expected funding balance is used in the probability of default and loss given default models to determine the reserve. The reserve for unfunded commitments was $12.8 million at December 31, 2020, and is recorded within other liabilities with changes recorded through other noninterest expense.
Premises and Equipment	Premises and Equipment Premises and equipment are carried at cost less accumulated depreciation. Land is carried at cost. Depreciation expense is generally computed using the straight-line method over the estimated useful lives of the assets. Leasehold improvements and capitalized leases are amortized on a straight-line basis over the lesser of the lease terms or the estimated useful lives of the assets.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price of an acquired entity over the fair value of the identifiable assets acquired. Goodwill is not amortized, but is evaluated at least annually for impairment during the third quarter, or when events or changes in circumstances indicate a potential impairment exists. five
Fair Values	Fair ValuesThe fair value of financial instruments and the methods and assumptions used in estimating fair value amounts and financial assets and liabilities for which fair value was elected are detailed in Note P
Income Taxes	Income Taxes Income taxes are accounted for using the asset and liability approach as prescribed in ASC 740, Income Taxes . Under this method, a deferred tax asset or liability is determined based on the currently enacted tax rates applicable to the period in which the differences between the financial statement carrying amounts and tax basis of existing assets and liabilities are expected to be reported in BancShares’ income tax returns. The effect on deferred taxes of a change in tax rates is recognized in income in the period which includes the enactment date. The potential impact of current events on the estimates used to establish income tax expenses and income tax liabilities is continually monitored and evaluated. Income tax positions based on current tax law, positions taken by various tax auditors within the jurisdictions where income tax returns are filed, as well as potential or pending audits or assessments by such tax auditors are evaluated on a periodic basis. BancShares has unrecognized tax benefits related to the uncertain portion of tax positions BancShares has taken or expects to take. A liability may be created or an amount refundable may be reduced for the amount of unrecognized tax benefits. These uncertainties result from the application of complex tax laws, rules, regulations and interpretations, primarily in state taxing jurisdictions. Unrecognized tax benefits are assessed quarterly and may be adjusted through current income tax expense in future periods based on changing facts and circumstances, completion of examinations by taxing authorities or expiration of a statute of limitations. Estimated penalties and interest on uncertain tax positions are recognized in income tax expense. BancShares files a consolidated federal income tax return and various combined and separate company state tax returns. See Note O, Income Taxes, for additional disclosures.
Per Share Data	Per Share Data Earnings per common share is computed by dividing net income available to common shareholders by the weighted average number of both classes of common shares outstanding during each period. BancShares had no potential dilutive common shares outstanding in any period and did not report diluted earnings per common share. Cash dividends per share apply to both Class A and Class B common stock. Shares of Class A common stock carry one vote per share, while shares of Class B common stock carry 16 votes per share.
Defined Benefit Pension Plan	Defined Benefit Pension Plans BancShares maintains noncontributory defined benefit pension plans covering certain qualifying employees. The calculation of the obligations and related expenses under the plans require the use of actuarial valuation methods and assumptions. Actuarial assumptions used in the determination of future values of plan assets and liabilities are subject to management judgment and may differ significantly if different assumptions are used. All assumptions are reviewed annually for appropriateness. The discount rate assumption used to measure the plan obligations is based on a yield curve developed from high-quality corporate bonds across a full maturity spectrum. The projected cash flows of the pension plans are discounted based on this yield curve, and a single discount rate is calculated to achieve the same present value. The assumed rate of future compensation increases is based on actual experience and future salary expectations. We also estimate a long-term rate of return on pension plan assets used to estimate the future value of plan assets. In developing the long-term rate of return, we consider such factors as the actual return earned on plan assets, historical returns on the various asset classes in the plans and projections of future returns on various asset classes. Refer to Note Q, Employee Benefit Plans, for disclosures related to BancShares’ defined benefit pension plans.
Lessee, Leases	Leases BancShares leases certain branch locations, administrative offices and equipment. Operating lease ROU assets are included in other assets and the associated lease obligations are included in other liabilities. Finance leases are included in premises and equipment and other borrowings. Leases with an initial term of 12 months or less are not recorded on the Consolidated Balance Sheets; we instead recognize lease expense for these leases on a straight-line basis over the lease term. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our corresponding obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. The operating and finance lease ROU asset also includes initial direct costs and pre-paid lease payments made, excluding lease incentives. As most of our leases do not provide an implicit rate, BancShares uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The incremental borrowing rate is determined using secured rates for new FHLB advances under similar terms as the lease at inception. We utilize the implicit or incremental borrowing rate at the effective date of a modification not accounted for as a separate contract or a change in the lease terms to determine the present value of lease payments. For operating leases commencing prior to January 1, 2019, BancShares used the incremental borrowing rate as of that date. Most leases include one or more options to renew, with renewal terms that can extend the lease term from 1 to 25 years. The exercise of lease renewal options is at our sole discretion. When it is reasonably certain we will exercise our option to renew or extend the lease term, the option is included in calculating the value of the ROU asset and lease liability. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. We determine if an arrangement is a lease at inception. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. We do not lease any properties or facilities from any related party. As of December 31, 2020, there were no leases that have not yet commenced that would have a material impact on our consolidated financial statements. See Note R, Leases, for additional disclosures.
Revenue from Contract with Customer	Revenue Recognition BancShares generally acts in a principal capacity, on its own behalf, in its contracts with customers. In these transactions, we recognize revenues and the related costs to generate those revenues on a gross basis. In certain, circumstances, we act in an agent capacity, on behalf of the customers with other entities, and recognize revenues and the related costs to provide our services on a net basis. Business lines where BancShares acts as an agent include cardholder and merchant services, insurance, and brokerage. Descriptions of our noninterest revenue-generating activities are broadly segregated as follows: Cardholder and Merchant Services - These represent interchange fees from customer debit and credit card transactions earned when a cardholder engages in a transaction with a merchant as well as fees charged to merchants for providing them the ability to accept and process the debit and credit card transaction. Revenue is recognized when the performance obligation has been satisfied, which is upon completion of the card transaction. Additionally, as FCB is acting as an agent for the customer and transaction processor, costs associated with cardholder and merchant services transactions are netted against the fee income. Service charges on deposit accounts - These deposit account-related fees represent monthly account maintenance and transaction-based service fees such as overdraft fees, stop payment fees and charges for issuing cashier’s checks and money orders. For account maintenance services, revenue is recognized at the end of the statement period when our performance obligation has been satisfied. All other revenues from transaction-based services are recognized at a point in time when the performance obligation has been completed. Wealth management services - These primarily represent sales commissions on various product offerings, transaction fees and trust and asset management fees. The performance obligation for wealth management services is the provision of services to place annuity products issued by the counterparty to investors and the provision of services to manage the client’s assets, including brokerage custodial and other management services. Revenue from wealth management services is recognized over the period in which services are performed, and is based on a percentage of the value of the assets under management/administration. Other service charges and fees - These include, but are not limited to, check cashing fees, international banking fees, internet banking fees, wire transfer fees and safe deposit fees. The performance obligation is fulfilled and revenue is recognized, at the point in time the requested service is provided to the customer. Insurance commissions - These represent commissions earned on the issuance of insurance products and services. The performance obligation is generally satisfied upon the issuance of the insurance policy and revenue is recognized when the commission payment is remitted by the insurance carrier or policy holder depending on whether the billing is performed by BancShares or the carrier. ATM income - These represent fees imposed on customers and non-customers for engaging in an ATM transaction. Revenue is recognized at the time of the transaction as the performance obligation of rendering the ATM service has been met. Other - This consists of several forms of recurring revenue such as FHLB dividends and income earned on changes in the cash surrender value of bank-owned life insurance. Prior to adoption of ASC 326, other income included recoveries on PCI loans previously charged-off. For the remaining immaterial transactions, revenue is recognized when, or as, the performance obligation is satisfied. Refer to Note N, Other Noninterest Income and Other Noninterest Expense, for additional disclosures on other noninterest income.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans This ASU modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans by eliminating the requirement to disclose the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year and adding a requirement to disclose an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. The amendments in this ASU are effective for public entities for fiscal years ending after December 15, 2020. Early adoption is permitted for all entities. BancShares adopted all applicable amendments during the fourth quarter of 2020. See Note Q. Employee Benefit Plans for changes to disclosure. FASB ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement This ASU modifies the disclosure requirements on fair value measurements by eliminating the requirements to disclose (1) the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy (2) the policy for timing of transfers between levels and (3) the valuation processes for Level 3 fair value measurements. This ASU also added specific disclosure requirements for fair value measurements for public business entities including the requirement to disclose the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. BancShares adopted this ASU during the first quarter of 2020 and have made all applicable updates to the disclosure within the Notes to the Consolidated Financial Statements. FASB ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment This ASU eliminates Step 2 from the goodwill impairment test. Under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this ASU, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. This ASU eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative test. BancShares adopted this ASU during the first quarter 2020 with no impact to our consolidated financial position or consolidated results of operations as a result of the adoption. There was no impairment recorded as a result of our annual assessment during the third quarter of 2020. FASB ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments This ASU (and all subsequent ASUs on this topic) introduce the CECL model, a new credit loss methodology, replacing multiple existing impairment methods in current GAAP, which generally require that a loss be incurred before it is recognized. The amendments in this ASU require loss estimates be determined over the lifetime of the asset and broaden the information that an entity must consider in developing its expected credit losses. The ASU does not specify a method for measuring expected credit losses and allows an entity to apply methods that reasonably reflect its expectations of the credit loss estimate based on the entity's size, complexity and risk profile. In addition, the disclosures of credit quality indicators in relation to the amortized cost of financing receivables, a current disclosure requirement, are further disaggregated by year of origination. BancShares adopted this ASU (and all subsequent ASUs on this topic) as of January 1, 2020 using the modified retrospective approach for all loans, leases, debt securities designated as held to maturity, and unfunded loan commitments. BancShares adopted the ASU using the prospective approach for debt securities available for sale and PCD loans previously accounted for under ASC 310-30. Results for reporting periods beginning after January 1, 2020 are presented under ASC 326, while prior period amounts continue to be reported in accordance with previously applicable GAAP. BancShares made changes to loan classifications and segmentation in order to align with ASC 326 requirements and facilitate CECL modeling. Using this updated segmentation, BancShares developed new loan level models to estimate the ACL and facilitate revised disclosures. Upon adoption, BancShares recorded a net decrease of $37.9 million in the ACL which included a reduction of $56.9 million in the ACL on non-PCD loans, offset by an increase of $19.0 million in the ACL on PCD loans. The $56.9 million reduction in the ACL on non-PCD loans, as well as an $8.9 million increase in the reserve for unfunded commitments, net of deferred taxes, resulted in an increase in retained earnings of $36.9 million. The $19.0 million increase in the ACL on PCD loans was a reclassification of the PCD credit discount and resulted in a gross up of loan balances by this same amount and did not have any effect on retained earnings. Impact to total capital and capital ratios was not significant and we did not elect the capital phase-in option allowable for regulatory reporting purposes. There was no ACL recorded on debt securities held to maturity at adoption. The largest changes in the ACL, affecting beginning retained earnings as a result of the adoption, were decreases in the ACL on commercial loan segments as these portfolios have exhibited strong historical credit performance and have relatively short average lives. The reduction in ACL on these segments was partially offset by increases in ACL on our consumer loan segments primarily due to their longer average lives. The increase in the reserve for unfunded commitments was primarily due to increases in the scope of off-balance sheet exposures considered in this estimate due to the provisions in ASC 326. BancShares adopted this ASU using the prospective transition approach for PCD loans previously accounted for under ASC 310-30. In accordance with the standard, we did not assess whether purchased credit impaired (“PCI”) loans met the criteria of PCD as of the date of adoption and all loans previously classified as PCI were updated to the PCD classification. Pools utilized for PCI accounting under ASC 310-30 were dissolved upon adoption. Loans from performing PCI pools, not previously considered nonaccrual of $47.0 million, were reclassified into nonaccrual status as a result of adoption. PCD loans were assessed using the loan level probability of default and loss given default models, as well as utilizing prior specific loan reviews to inform the initial PCD loan ACL. The ACL for PCD loans increased as a result of adoption and the amortized cost basis of these loans was adjusted to reflect the transfer of this amount from credit discount to ACL. The remaining noncredit discount will be accreted into interest income at the effective interest rate as of January 1, 2020. At the date of adoption, no securities were determined to be PCD. BancShares also adopted this ASU under the prospective transition approach for debt securities available for sale. No previously recorded other than temporary impairment was reported on the portfolio of debt securities.

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Schedule of Assets Acquired and Liabilities Assumed	The following table provides the purchase price as of the acquisition date and the identifiable assets acquired and liabilities assumed at their estimated fair values: (Dollars in thousands) As recorded by FCB Purchase price $ 2,320 Assets Cash and due from banks $ 1,085 Overnight investments 35,129 Investment securities 30,146 Loans 133,989 Premises and equipment 7,624 Other real estate owned 9,813 Income earned not collected 558 Intangible assets 536 Other assets 2,520 Total assets acquired 221,400 Liabilities Deposits 209,340 Borrowings 9,925 Other liabilities 501 Total liabilities assumed $ 219,766 Fair value of net assets acquired 1,634 Goodwill recorded for Community Financial $ 686

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2020
Investments [Abstract]
Aggregate Values And Unrealized Gains And Losses Of Investment Securities	The amortized cost and fair value of investment and marketable equity securities at December 31, 2020 and 2019, were as follows: December 31, 2020 (Dollars in thousands) Cost Gross Gross unrealized Allowance for credit losses Fair Investment securities available for sale U.S. Treasury $ 499,832 $ 101 $ — $ — $ 499,933 Government agency 706,241 723 5,573 — 701,391 Residential mortgage-backed securities 4,369,130 70,283 1,310 — 4,438,103 Commercial mortgage-backed securities 745,892 25,645 — — 771,537 Corporate bonds 590,870 14,437 2,028 — 603,279 Total investment securities available for sale $ 6,911,965 $ 111,189 $ 8,911 $ — $ 7,014,243 Investment in marketable equity securities 84,837 8,654 1,811 91,680 Investment securities held to maturity Residential mortgage-backed securities 1,877,692 17,689 — — 1,895,381 Commercial mortgage-backed securities 937,034 3,884 56 — 940,862 Other 2,256 — — — 2,256 Total investment securities held to maturity 2,816,982 21,573 56 — 2,838,499 Total investment securities $ 9,813,784 $ 141,416 $ 10,778 $ — $ 9,944,422 December 31, 2019 Cost Gross Gross unrealized Fair Investment securities available for sale U.S. Treasury $ 409,397 $ 602 $ — $ 409,999 Government agency 684,085 928 2,241 682,772 Residential mortgage-backed securities 5,269,060 13,417 15,387 5,267,090 Commercial mortgage-backed securities 373,105 6,974 59 380,020 Corporate bonds 198,278 3,420 132 201,566 State, county and municipal 118,227 — — 118,227 Total investment securities available for sale $ 7,052,152 $ 25,341 $ 17,819 $ 7,059,674 Investment in marketable equity securities 59,262 23,304 233 82,333 Investment securities held to maturity Other 30,996 — — 30,996 Total investment securities $ 7,142,410 $ 48,645 $ 18,052 $ 7,173,003
Investment Securities Maturity Information	The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Residential and commercial mortgage-backed and government agency securities are stated separately as they are not due at a single maturity date. December 31, 2020 December 31, 2019 (Dollars in thousands) Cost Fair Cost Fair Investment securities available for sale Non-amortizing securities maturing in: One year or less $ 500,846 $ 500,954 $ 406,325 $ 406,927 One through five years 72,565 73,881 24,496 24,971 Five through 10 years 508,320 519,570 185,209 187,868 Over 10 years 8,971 8,807 109,872 110,026 Government agency 706,241 701,391 684,085 682,772 Residential mortgage-backed securities 4,369,130 4,438,103 5,269,060 5,267,090 Commercial mortgage-backed securities 745,892 771,537 373,105 380,020 Total investment securities available for sale $ 6,911,965 $ 7,014,243 $ 7,052,152 $ 7,059,674 Investment securities held to maturity Non-amortizing securities maturing in: One year or less $ 1,507 $ 1,507 $ 30,746 $ 30,746 One through five years 749 749 250 250 Residential mortgage-backed securities 1,877,692 1,895,381 — — Commercial mortgage-backed securities 937,034 940,862 — — Total investment securities held to maturity $ 2,816,982 $ 2,838,499 $ 30,996 $ 30,996
Securities Gains (Losses)	For each period presented, realized gains on investment securities available for sale included the following: Year ended December 31 (Dollars in thousands) 2020 2019 2018 Gross gains on retirement/sales of investment securities available for sale $ 60,932 $ 8,993 $ 353 Gross losses on sales of investment securities available for sale (679) (1,878) (2) Realized gains on investment securities available for sale, net $ 60,253 $ 7,115 $ 351
Schedule of Realized and Unrealized Gains or Losses on Marketable Equity Securities	realized and unrealized gains or losses on marketable equity securities included the following: Year ended December 31 (Dollars in thousands) 2020 2019 2018 Marketable equity securities gains (losses), net $ 29,395 $ 20,625 $ (7,610) Less net gains recognized on marketable equity securities sold 44,550 16,344 1,190 Unrealized (losses) gains recognized on marketable equity securities held $ (15,155) $ 4,281 $ (8,800)
Investment Securities With Unrealized Losses	The following table provides information regarding investment securities with unrealized losses as of December 31, 2020 and 2019: December 31, 2020 Less than 12 months 12 months or more Total (Dollars in thousands) Fair Unrealized Fair Unrealized Fair Unrealized Investment securities available for sale Government agency $ 268,622 $ 3,197 $ 328,777 $ 2,376 $ 597,399 $ 5,573 Residential mortgage-backed securities 433,816 1,241 23,064 69 456,880 1,310 Corporate bonds 57,715 2,028 — — 57,715 2,028 Total $ 760,153 $ 6,466 $ 351,841 $ 2,445 $ 1,111,994 $ 8,911 December 31, 2019 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized Investment securities available for sale Government agency $ 347,081 $ 1,827 $ 63,947 $ 414 $ 411,028 $ 2,241 Residential mortgage-backed securities 2,387,293 14,016 264,257 1,371 2,651,550 15,387 Commercial mortgage-backed securities 35,926 59 — — 35,926 59 Corporate bonds 7,714 123 4,749 9 12,463 132 Total $ 2,778,014 $ 16,025 $ 332,953 $ 1,794 $ 3,110,967 $ 17,819

Loans and Leases (Tables)

Loans and Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Loans and Leases Receivable Disclosure [Abstract]
Loans And Leases Outstanding	Loans and leases outstanding include the following at December 31, 2020 and 2019: (Dollars in thousands) December 31, 2020 Commercial: Construction and land development $ 985,424 Owner occupied commercial mortgage 11,165,012 Non-owner occupied commercial mortgage 2,987,689 Commercial and industrial and leases 5,013,644 SBA-PPP 2,406,291 Total commercial loans 22,558,060 Consumer: Residential mortgage 5,561,686 Revolving mortgage 2,052,854 Construction and land development 348,123 Consumer auto 1,255,402 Consumer other 552,968 Total consumer loans 9,771,033 Total non-PCD loans and leases 32,329,093 PCD loans 462,882 Total loans and leases $ 32,791,975 (Dollars in thousands) December 31, 2019 Commercial: Construction and land development $ 1,013,454 Commercial mortgage 12,282,635 Other commercial real estate 542,028 Commercial and industrial and leases 4,403,792 Other 310,093 Total commercial loans 18,552,002 Noncommercial: Residential mortgage 5,293,917 Revolving mortgage 2,339,072 Construction and land development 357,385 Consumer 1,780,404 Total noncommercial loans 9,770,778 Total non-PCI loans and leases 28,322,780 PCI loans 558,716 Total loans and leases $ 28,881,496
Recorded Investment, By Class, In Loans And Leases On Nonaccrual Status And Loans And Leases Greater Than 90 Days Past Due And Still Accruing	The aging of the outstanding loans and leases, by class, at December 31, 2020 and December 31, 2019 is provided in the tables below. Loans and leases 30 days or less past due are considered current, as various grace periods allow borrowers to make payments within a stated period after the due date and still remain in compliance with the loan agreement. December 31, 2020 (Dollars in thousands) 30-59 days 60-89 days 90 days or greater Total past Current Total loans Commercial: Construction and land development $ 956 $ 527 $ 1,603 $ 3,086 $ 982,338 $ 985,424 Owner occupied commercial mortgage 8,757 2,232 14,082 25,071 11,139,941 11,165,012 Non-owner occupied commercial mortgage 12,370 — 5,973 18,343 2,969,346 2,987,689 Commercial and industrial and leases 14,532 2,842 3,243 20,617 4,993,027 5,013,644 SBA-PPP — — — — 2,406,291 2,406,291 Total commercial loans 36,615 5,601 24,901 67,117 22,490,943 22,558,060 Consumer: Residential mortgage 43,218 8,364 31,690 83,272 5,478,414 5,561,686 Revolving mortgage 11,977 2,626 7,415 22,018 2,030,836 2,052,854 Construction and land development 932 77 330 1,339 346,784 348,123 Consumer auto 6,825 1,835 1,076 9,736 1,245,666 1,255,402 Consumer other 3,610 1,464 1,505 6,579 546,389 552,968 Total consumer loans 66,562 14,366 42,016 122,944 9,648,089 9,771,033 PCD loans 18,322 6,076 31,026 55,424 407,458 462,882 Total loans and leases $ 121,499 $ 26,043 $ 97,943 $ 245,485 $ 32,546,490 $ 32,791,975 December 31, 2019 (Dollars in thousands) 30-59 days 60-89 days 90 days or greater Total past Current Total loans Commercial: Construction and land development $ 3,146 $ 195 $ 2,702 $ 6,043 $ 1,007,411 $ 1,013,454 Commercial mortgage 20,389 8,774 8,319 37,482 12,245,153 12,282,635 Other commercial real estate 861 331 698 1,890 540,138 542,028 Commercial and industrial and leases 18,269 4,842 5,032 28,143 4,375,649 4,403,792 Other 51 411 126 588 309,505 310,093 Total commercial loans 42,716 14,553 16,877 74,146 18,477,856 18,552,002 Noncommercial: Residential mortgage 45,839 18,289 24,409 88,537 5,205,380 5,293,917 Revolving mortgage 9,729 3,468 9,865 23,062 2,316,010 2,339,072 Construction and land development 977 218 1,797 2,992 354,393 357,385 Consumer 10,481 3,746 3,571 17,798 1,762,606 1,780,404 Total noncommercial loans 67,026 25,721 39,642 132,389 9,638,389 9,770,778 PCI loans 26,478 10,784 28,973 66,235 492,481 558,716 Total loans and leases $ 136,220 $ 51,058 $ 85,492 $ 272,770 $ 28,608,726 $ 28,881,496 The amortized cost, by class, of loans and leases on nonaccrual status, and loans and leases greater than 90 days past due and still accruing at December 31, 2020 and December 31, 2019, were as follows: January 1, 2020 (1) December 31, 2020 (Dollars in thousands) Nonaccrual Nonaccrual Loans and Commercial: Construction and land development $ 4,281 $ 1,661 $ — Owner occupied commercial mortgage 24,476 23,103 3,625 Non-owner occupied commercial mortgage 5,965 7,932 147 Commercial and industrial and leases 7,685 10,626 540 Total commercial loans 42,407 43,322 4,312 Consumer: Residential mortgage 44,357 66,345 — Revolving mortgage 22,411 22,236 — Construction and land development 2,828 652 — Consumer auto 2,145 3,166 — Consumer other 798 823 1,195 Total consumer loans 72,539 93,222 1,195 PCD loans 53,771 54,939 355 Total loans and leases $ 168,717 $ 191,483 $ 5,862 (1) Upon the adoption of ASC 326, BancShares eliminated the pooling of PCI loans and as a result $47.0 million in additional PCD loans were recognized as nonaccrual loans at January 1, 2020. As of December 31, 2020, $24.9 million of these loans remained outstanding. December 31, 2019 (Dollars in thousands) Nonaccrual Loans and Commercial: Construction and land development $ 4,281 $ — Commercial mortgage 29,733 — Commercial and industrial and leases 7,365 1,094 Other commercial real estate 708 — Other 320 — Total commercial loans 42,407 1,094 Consumer: Construction and land development 2,828 — Residential mortgage 44,357 45 Revolving mortgage 22,411 — Consumer 2,943 2,152 Total noncommercial loans 72,539 2,197 Total non-PCI loans and leases $ 114,946 $ 3,291
Financing Receivable Credit Quality Indicators	The following tables represent current credit quality indicators by origination year as of December 31, 2020. Commercial Loans Amortized Cost Basis by Origination Year Classification: 2020 2019 2018 2017 2016 Prior Revolving Revolving converted to term loans Total (Dollars in thousands) Construction and land development Pass $ 342,183 $ 341,233 $ 190,429 $ 50,776 $ 23,969 $ 11,306 $ 10,969 $ — $ 970,865 Special Mention 246 — 6,421 5,342 — — 153 — 12,162 Substandard 229 629 1,450 — 8 81 — — 2,397 Total 342,658 341,862 198,300 56,118 23,977 11,387 11,122 — 985,424 Owner occupied commercial mortgage Pass 3,183,467 2,201,165 1,625,141 1,301,412 1,049,858 1,454,020 101,556 133 10,916,752 Special Mention 6,274 20,702 36,739 12,387 17,699 25,693 5,115 72 124,681 Substandard 10,280 19,052 9,842 20,928 13,736 41,303 8,438 — 123,579 Total 3,200,021 2,240,919 1,671,722 1,334,727 1,081,293 1,521,016 115,109 205 11,165,012 Non-owner occupied commercial mortgage Pass 865,514 609,975 378,136 331,800 282,810 391,517 32,149 — 2,891,901 Special Mention 569 905 10,794 1,808 5,121 3,279 483 — 22,959 Substandard 2,899 18,546 12,296 8,764 14,087 15,427 810 — 72,829 Total 868,982 629,426 401,226 342,372 302,018 410,223 33,442 — 2,987,689 Commercial and industrial and leases Pass 1,620,622 983,852 504,463 310,468 234,735 286,996 899,978 5,520 4,846,634 Special Mention 3,146 17,065 7,265 5,393 3,307 4,912 9,152 189 50,429 Substandard 17,811 4,095 4,370 4,257 2,548 3,801 22,384 983 60,249 Ungraded — — — — — — 56,332 — 56,332 Total 1,641,579 1,005,012 516,098 320,118 240,590 295,709 987,846 6,692 5,013,644 SBA-PPP Pass 2,406,291 — — — — — — — 2,406,291 Total commercial $ 8,459,531 $ 4,217,219 $ 2,787,346 $ 2,053,335 $ 1,647,878 $ 2,238,335 $ 1,147,519 $ 6,897 $ 22,558,060 Consumer and PCD Loans Amortized Cost Basis by Origination Year Days Past Due: 2020 2019 2018 2017 2016 Prior Revolving Revolving converted to term loans Total (Dollars in thousands) Residential mortgage Current $ 1,882,683 $ 978,298 $ 655,798 $ 596,309 $ 461,719 $ 878,634 $ 24,973 $ — $ 5,478,414 30-59 days 2,278 4,573 11,463 3,772 8,613 12,299 220 — 43,218 60-89 days 30 100 1,246 1,449 834 4,705 — — 8,364 90 days or greater 282 4,831 3,150 4,015 5,689 13,723 — — 31,690 Total 1,885,273 987,802 671,657 605,545 476,855 909,361 25,193 — 5,561,686 Revolving mortgage Current — — — — — — 1,879,968 150,868 2,030,836 30-59 days — — — — — — 8,241 3,736 11,977 60-89 days — — — — — — 527 2,099 2,626 90 days or greater — — — — — — 2,301 5,114 7,415 Total — — — — — — 1,891,037 161,817 2,052,854 Construction and land development Current 215,112 85,707 24,860 10,269 6,093 2,218 2,525 — 346,784 30-59 days — 420 121 370 — 21 — — 932 60-89 days — — — 9 — 68 — — 77 90 days or greater — — — — — 330 — — 330 Total 215,112 86,127 24,981 10,648 6,093 2,637 2,525 — 348,123 Consumer auto Current 521,719 340,594 219,597 104,280 49,872 9,604 — — 1,245,666 30-59 days 2,175 1,873 1,257 842 544 134 — — 6,825 60-89 days 329 689 312 351 109 45 — — 1,835 90 days or greater 170 527 217 57 102 3 — — 1,076 Total 524,393 343,683 221,383 105,530 50,627 9,786 — — 1,255,402 Consumer other Current 53,842 27,117 10,911 7,159 2,980 29,336 415,044 — 546,389 30-59 days 322 114 77 18 11 7 3,061 — 3,610 60-89 days 102 20 13 18 3 23 1,285 — 1,464 90 days or greater 53 84 8 — — — 1,360 — 1,505 Total 54,319 27,335 11,009 7,195 2,994 29,366 420,750 — 552,968 Total consumer 2,679,097 1,444,947 929,030 728,918 536,569 951,150 2,339,505 161,817 9,771,033 PCD loans Current 31,475 25,425 27,183 27,955 28,995 232,186 13,212 21,027 407,458 30-59 days 999 925 801 718 1,341 12,637 156 745 18,322 60-89 days 447 81 312 695 97 4,098 9 337 6,076 90 days or greater 721 2,325 4,755 1,208 897 19,963 111 1,046 31,026 Total PCD 33,642 28,756 33,051 30,576 31,330 268,884 13,488 23,155 462,882 Total loans and leases $ 11,172,270 $ 5,690,922 $ 3,749,427 $ 2,812,829 $ 2,215,777 $ 3,458,369 $ 3,500,512 $ 191,869 $ 32,791,975 Loans and leases outstanding at December 31, 2019 by credit quality indicator are provided below: December 31, 2019 Commercial loans and leases (Dollars in thousands) Construction and land Commercial mortgage Other commercial real estate Commercial and industrial and leases Other PCI Total commercial loans and leases Grade: Pass $ 1,004,922 $ 12,050,799 $ 536,682 $ 4,256,456 $ 308,796 $ 148,412 $ 18,306,067 Special mention 2,577 115,164 3,899 44,604 622 44,290 211,156 Substandard 5,955 116,672 1,447 34,148 675 87,970 246,867 Doubtful — — — 3 — 3,657 3,660 Ungraded — — — 68,581 — — 68,581 Total $ 1,013,454 $ 12,282,635 $ 542,028 $ 4,403,792 $ 310,093 $ 284,329 $ 18,836,331 December 31, 2019 Noncommercial loans and leases (Dollars in thousands) Residential mortgage Revolving mortgage Construction and land development Consumer PCI Total noncommercial loans and leases Days past due: Current $ 5,205,380 $ 2,316,010 $ 354,393 $ 1,762,606 $ 240,995 $ 9,879,384 30-59 days past due 45,839 9,729 977 10,481 13,764 80,790 60-89 days past due 18,289 3,468 218 3,746 5,608 31,329 90 days or greater past due 24,409 9,865 1,797 3,571 14,020 53,662 Total $ 5,293,917 $ 2,339,072 $ 357,385 $ 1,780,404 $ 274,387 $ 10,045,165
Schedule of Loans Pledged as Collateral	The following table provides information regarding loans pledged as collateral for borrowing capacity through the FHLB of Atlanta and the Federal Reserve Bank (“FRB”) as of December 31, 2020 and 2019: (Dollars in thousands) December 31, 2020 December 31, 2019 FHLB of Atlanta Lendable collateral value of pledged non-PCD loans $ 8,637,844 $ 6,574,636 Less: advances 652,675 563,690 Available borrowing capacity $ 7,985,169 $ 6,010,946 Pledged non-PCD loans $ 12,157,153 $ 9,407,688 FRB Lendable collateral value of pledged non-PCD loans $ 3,321,762 $ 2,981,712 Less: advances — — Available borrowing capacity $ 3,321,762 $ 2,981,712 Pledged non-PCD loans $ 4,104,866 $ 3,684,919
Schedule of Loans and Leases Purchased	Purchased loans and leases The following table summarizes PCD loans acquired in the Community Financial transaction and provides the contractually required payments, less the initial allowance for credit losses and discount to produce the fair value of acquired loans with evidence of more than insignificant credit quality deterioration since origination at the acquisition date: (Dollars in thousands) Community Financial Contractually required payments $ 25,635 Initial PCD allowance 1,193 Discount 1,055 Fair value at acquisition date $ 23,387 The recorded fair values of purchased non-PCD loans acquired in the Community Financial transaction as of the acquisition date are as follows: (Dollars in thousands) Community Financial Commercial: Construction and land development $ 9,428 Owner occupied commercial mortgage 31,473 Non-owner occupied commercial mortgage 25,143 Commercial and industrial and leases 15,065 Total commercial loans 81,109 Consumer: Residential mortgage 21,168 Revolving mortgage 2,084 Construction and land development 5,254 Consumer auto 294 Consumer other 693 Total consumer loans 29,493 Total non-PCD loans $ 110,602

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Allowance for Credit Losses	Activity in the allowance for credit losses by class of loans is summarized as follows: Year ended December 31, 2020 (Dollars in thousands) Construction and land development - commercial Owner occupied commercial mortgage Non-owner occupied commercial mortgage Commercial and industrial and leases Residential mortgage Revolving mortgage Construction and land development - consumer Consumer auto Consumer other PCD Total Allowance for credit losses: Balance at December 31, 2019 $ 33,213 $ 36,444 $ 11,102 $ 61,610 $ 18,232 $ 19,702 $ 2,709 $ 4,292 $ 30,301 $ 7,536 $ 225,141 Adoption of ASC 326 (31,061) (19,316) 460 (37,637) 17,118 3,665 (1,291) 1,100 10,037 19,001 (37,924) Balance at January 1, 2020 2,152 17,128 11,562 23,973 35,350 23,367 1,418 5,392 40,338 26,537 187,217 Provision (credits) 4,301 6,729 12,917 13,816 9,684 1,134 266 6,297 10,410 (7,202) 58,352 Initial allowance on PCD loans — — — — — — — — — 1,193 1,193 Charge-offs (138) (593) (1,951) (14,904) (1,653) (1,662) (70) (3,646) (17,188) (3,300) (45,105) Recoveries 431 401 124 4,894 717 1,918 117 1,417 5,879 6,759 22,657 Balance at December 31, 2020 $ 6,746 $ 23,665 $ 22,652 $ 27,779 $ 44,098 $ 24,757 $ 1,731 $ 9,460 $ 39,439 $ 23,987 $ 224,314 Years ended December 31, 2019 and 2018 (Dollars in thousands) Construction Commercial Other Commercial Other Residential Revolving Construction Consumer PCI Total Allowance for credit losses: Balance at January 1, 2018 $ 24,470 $ 45,005 $ 4,571 $ 59,824 $ 4,689 $ 15,706 $ 22,436 $ 3,962 $ 31,204 $ 10,026 $ 221,893 Provision (credits) 10,533 (1,490) (2,171) 2,511 (2,827) 897 1,112 (1,520) 22,187 (765) 28,467 Charge-offs (44) (1,140) (69) (10,211) (130) (1,689) (3,235) (219) (22,817) (117) (39,671) Recoveries 311 1,076 150 3,496 489 558 1,549 127 5,267 — 13,023 Balance at December 31, 2018 35,270 43,451 2,481 55,620 2,221 15,472 21,862 2,350 35,841 9,144 223,712 Provision (credits) (2,171) 2,384 (285) 14,212 (754) 3,481 (788) 359 16,611 (1,608) 31,441 Charge-offs (196) (1,096) — (13,352) (100) (1,137) (2,584) — (24,562) — (43,027) Recoveries 310 596 15 2,894 869 416 1,212 — 6,703 — 13,015 Balance at December 31, 2019 $ 33,213 $ 45,335 $ 2,211 $ 59,374 $ 2,236 $ 18,232 $ 19,702 $ 2,709 $ 34,593 $ 7,536 $ 225,141 (Dollars in thousands) Year ended December 31, 2020 Allowance for credit losses: Balance at December 31, 2019 $ 1,055 Adoption of ASC 326 8,885 Balance at January 1, 2020 $ 9,940 Provision 2,874 Balance at December 31, 2020 12,814 (Dollars in thousands) Collateral-Dependant Loans Net Realizable Value of Collateral Collateral Coverage Allowance for Credit Losses Commercial loans: Construction and land development $ 1,424 $ 1,795 126.1 % $ — Owner occupied commercial mortgage 9,792 14,253 145.6 — Non-owner occupied commercial mortgage 5,556 7,577 136.4 — Total commercial loans 16,772 23,625 140.9 — Consumer: Residential mortgage 23,011 29,775 129.4 131 Total non-PCD loans 39,783 53,400 134.2 131 PCD 19,042 27,872 146.4 — Total collateral-dependent loans $ 58,825 $ 81,272 138.2 % $ 131 The following tables present the allowance and recorded investment in loans and leases by class of loans, as well as the associated impairment method at December 31, 2019. December 31, 2019 (Dollars in thousands) Construction Commercial Other Commercial Other Residential Revolving Construction Consumer Total Non-PCI Loans Allowance for loan and lease losses: ALLL for loans and leases individually evaluated for impairment $ 463 $ 3,650 $ 39 $ 1,379 $ 103 $ 3,278 $ 2,722 $ 174 $ 1,107 $ 12,915 ALLL for loans and leases collectively evaluated for impairment 32,750 41,685 2,172 57,995 2,133 14,954 16,980 2,535 33,486 204,690 Total allowance for loan and lease losses $ 33,213 $ 45,335 $ 2,211 $ 59,374 $ 2,236 $ 18,232 $ 19,702 $ 2,709 $ 34,593 $ 217,605 Loans and leases: Loans and leases individually evaluated for impairment $ 4,655 $ 70,149 $ 1,268 $ 12,182 $ 639 $ 60,442 $ 28,869 $ 3,882 $ 3,513 $ 185,599 Loans and leases collectively evaluated for impairment 1,008,799 12,212,486 540,760 4,391,610 309,454 5,233,475 2,310,203 353,503 1,776,891 28,137,181 Total loan and leases $ 1,013,454 $ 12,282,635 $ 542,028 $ 4,403,792 $ 310,093 $ 5,293,917 $ 2,339,072 $ 357,385 $ 1,780,404 $ 28,322,780 The following tables present the recorded investment and related allowance in non-PCI impaired loans and leases by class of loans, as well as the unpaid principle balance. December 31, 2019 (Dollars in thousands) With a With no Total Unpaid Related Non-PCI impaired loans and leases Commercial: Construction and land development $ 1,851 $ 2,804 $ 4,655 $ 5,109 $ 463 Commercial mortgage 42,394 27,755 70,149 74,804 3,650 Other commercial real estate 318 950 1,268 1,360 39 Commercial and industrial and leases 7,547 4,635 12,182 13,993 1,379 Other 406 233 639 661 103 Total commercial loans 52,516 36,377 88,893 95,927 5,634 Noncommercial: Residential mortgage 48,796 11,646 60,442 64,741 3,278 Revolving mortgage 26,104 2,765 28,869 31,960 2,722 Construction and land development 2,470 1,412 3,882 4,150 174 Consumer 3,472 41 3,513 3,821 1,107 Total noncommercial loans 80,842 15,864 96,706 104,672 7,281 Total non-PCI impaired loans and leases $ 133,358 $ 52,241 $ 185,599 $ 200,599 $ 12,915 The following tables show the average non-PCI impaired loan balance and the interest income recognized by loan class for the years ended December 31, 2019 and 2018: 2019 2018 (Dollars in thousands) Average Interest Income Recognized Average Interest Income Recognized Non-PCI impaired loans and leases: Commercial: Construction and land development $ 3,915 $ 53 $ 1,734 $ 84 Commercial mortgage 64,363 2,188 65,943 2,569 Other commercial real estate 919 27 1,225 43 Commercial and industrial and leases 11,884 482 9,560 364 Other 396 11 135 3 Total commercial 81,477 2,761 78,597 3,063 Noncommercial: Residential mortgage 52,045 1,386 41,368 1,237 Revolving mortgage 29,516 1,009 26,759 900 Construction and land development 3,589 116 3,677 172 Consumer 3,311 138 2,722 116 Total noncommercial 88,461 2,649 74,526 2,425 Total non-PCI impaired loans and leases $ 169,938 $ 5,410 $ 153,123 $ 5,488
Allocation of Allowance for Credit Losses	The following table presents the PCI allowance and recorded investment in loans at December 31, 2019. (Dollars in thousands) December 31, 2019 Allowance for loan losses: ALLL for loans acquired with deteriorated credit quality $ 7,536 Loans acquired with deteriorated credit quality 558,716
Troubled Debt Restructuring, Summary of Accrual Status	The following tables provides a summary of total TDRs by accrual status. Total TDRs at December 31, 2020 were $208.2 million. Total TDRs at December 31, 2019, were $171.2 million, of which $154.0 million were non-PCI and $17.2 million were PCI. Total TDRs at December 31, 2018, were $156.1 million, of which $137.9 million were non-PCI and $18.2 million were PCI. December 31, 2020 (Dollars in thousands) Accruing Nonaccruing Total Commercial loans: Construction and land development $ 578 $ 54 $ 632 Owner occupied commercial mortgage 37,574 10,889 48,463 Non-owner occupied commercial mortgage 18,336 1,649 19,985 Commercial and industrial and leases 29,131 3,528 32,659 Total commercial loans 85,619 16,120 101,739 Consumer: Residential mortgage 29,458 19,380 48,838 Revolving mortgage 20,124 7,128 27,252 Construction and land development 1,573 9 1,582 Consumer auto 2,018 696 2,714 Consumer other 955 137 1,092 Total consumer loans 54,128 27,350 81,478 PCD loans 17,617 7,346 24,963 Total loans $ 157,364 $ 50,816 $ 208,180 December 31, 2019 December 31, 2018 (Dollars in thousands) Accruing Nonaccruing Total Accruing Nonaccruing Total Commercial loans: Construction and land development $ 487 $ 2,279 $ 2,766 $ 1,946 $ 352 $ 2,298 Commercial mortgage 50,819 11,116 61,935 53,270 7,795 61,065 Other commercial real estate 571 — 571 851 9 860 Commercial and industrial and leases 9,430 2,409 11,839 7,986 2,060 10,046 Other 320 105 425 118 173 291 Total commercial loans 61,627 15,909 77,536 64,171 10,389 74,560 Noncommercial: Residential mortgage 41,813 16,048 57,861 37,903 9,621 47,524 Revolving mortgage 21,032 7,367 28,399 20,492 8,196 28,688 Construction and land development 1,452 2,430 3,882 2,227 110 2,337 Consumer 2,826 688 3,514 2,300 721 3,021 Total noncommercial loans 67,123 26,533 93,656 62,922 18,648 81,570 Total loans $ 128,750 $ 42,442 $ 171,192 $ 127,093 $ 29,037 $ 156,130
Troubled Debt Restructurings on Financing Receivables	2020 2019 2018 All restructurings Restructurings with payment default All restructurings Restructurings with payment default All restructurings Restructurings with payment default Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end Number of loans Amortized cost at period end (Dollars in thousands) Loans and leases Interest only period provided Commercial loans 31 $ 28,145 4 $ 4,498 11 $ 1,595 1 $ 238 3 $ 1,003 — $ — Consumer loans 6 4,169 5 2,569 7 4,018 2 2,717 — — — — Total interest only 37 32,314 9 7,067 18 5,613 3 2,955 3 1,003 — — Loan term extension Commercial loans 26 5,444 5 1,471 16 3,904 5 533 21 3,933 4 675 Consumer loans 66 5,689 43 3,241 2 342 1 306 21 1,554 4 190 Total loan term extension 92 11,133 48 4,712 18 4,246 6 839 42 5,487 8 865 Below market interest rate Commercial loans 98 33,870 26 1,912 90 13,932 24 2,634 85 12,859 24 2,998 Consumer loans 156 6,074 60 3,897 176 12,458 66 4,014 184 15,545 68 5,461 Total below market interest rate 254 39,944 86 5,809 266 26,390 90 6,648 269 28,404 92 8,459 Discharged from bankruptcy Commercial loans 30 1,168 17 286 25 5,571 20 5,028 26 2,043 8 825 Consumer loans 186 8,129 66 2,928 178 10,349 71 4,239 151 6,617 56 3,169 Total discharged from bankruptcy 216 9,297 83 3,214 203 15,920 91 9,267 177 8,660 64 3,994 Total restructurings 599 $ 92,688 226 $ 20,802 505 $ 52,169 190 $ 19,709 491 $ 43,554 164 $ 13,318

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Premises and Equipment	Major classifications of premises and equipment at December 31, 2020 and 2019 are summarized as follows: (Dollars in thousands) Useful Life ( years ) 2020 2019 Land indefinite $ 336,258 $ 335,093 Premises and leasehold improvements 3 - 40 1,286,092 1,228,588 Furniture, equipment and software 3 - 10 639,109 595,686 Total 2,261,459 2,159,367 Less accumulated depreciation and amortization 1,010,176 914,971 Total premises and equipment $ 1,251,283 $ 1,244,396

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2020
Other Real Estate [Abstract]
Changes in Other Real Estate Owned	The following table explains changes in other real estate owned (“OREO”) for the years ended December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Balance at January 1 $ 46,591 $ 48,030 Additions 26,822 21,684 Acquired in business combinations 9,813 5,459 Sales (26,726) (24,432) Write-downs/losses (5,610) (4,150) Balance at December 31 50,890 46,591 At December 31, 2020 and 2019, BancShares had $5.8 million and $14.5 million, respectively, of foreclosed residential real estate property in OREO. The recorded investment in consumer mortgage loans collateralized by residential real estate property in the process of foreclosure was $29.4 million and $23.0 million at December 31, 2020, and 2019, respectively. Gains recorded on the sale of OREO were $1.6 million and $1.5 million for the years ended December 31, 2020 and 2019, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Goodwill	The following table presents the changes in the carrying amount of goodwill as of December 31, 2020 and 2019: Year ended December 31 (Dollars in thousands) 2020 2019 Balance at January 1 $ 349,398 $ 236,347 Recognized in the Community Financial acquisition 686 — Measurement period adjustments (1) 214 — Recognized in the Biscayne Bancshares acquisition — 46,521 Recognized in the First South Bancorp acquisition — 13,896 Recognized in the Entegra acquisition — 52,634 Balance at December 31 $ 350,298 $ 349,398 (1) See Note B, Business Combinations for additional information
Schedule of Mortgage Servicing Rights at Amortized Cost	The activity of the mortgage servicing asset for the years ended December 31, 2020, 2019 and 2018 is presented in the following table: (Dollars in thousands) 2020 2019 2018 Balance at January 1 $ 22,963 $ 21,396 $ 21,945 Servicing rights originated 8,006 6,149 5,258 Servicing rights acquired in Entegra transaction — 1,873 — Amortization (8,400) (6,233) (5,807) Valuation allowance increase (4,143) (222) — Balance at December 31 $ 18,426 $ 22,963 $ 21,396
Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets	The following table presents the activity in the servicing asset valuation allowance for the years ended December 31, 2020, 2019 and 2018: (Dollars in thousands) 2020 2019 2018 Beginning balance $ 222 $ — $ — Valuation allowance increase 4,143 222 — Ending balance $ 4,365 $ 222 $ —
Mortgage Servicing Rights Key Economic Assumptions Used to Value	Key economic assumptions used to value mortgage servicing rights as of December 31, 2020 and 2019, were as follows: 2020 2019 Discount rate - conventional fixed loans 7.92 % 8.92 % Discount rate - all loans excluding conventional fixed loans 8.92 % 9.92 % Weighted average constant prepayment rate 20.62 % 13.72 % Weighted average cost to service a loan $ 87.58 $ 87.09
Schedule of Other Intangible Assets	The following information relates to core deposit intangible assets, which are being amortized over their estimated useful lives: (Dollars in thousands) 2020 2019 Balance at January 1 $ 43,386 $ 48,232 Acquired in Community Financial transaction 536 — Acquired in Biscayne Bancshares transaction — 4,745 Acquired in First South Bancorp transaction — 2,268 Acquired in Entegra transaction — 4,487 Amortization (14,255) (16,346) Balance at December 31 $ 29,667 $ 43,386 The gross amount of core deposit intangible assets and accumulated amortization as of December 31, 2020 and 2019, are: (Dollars in thousands) 2020 2019 Gross balance $ 127,842 $ 154,507 Accumulated amortization (98,175) (111,121) Carrying value $ 29,667 $ 43,386
Future Amortization Expense Schedule	Based on current estimated useful lives and carrying values, BancShares anticipates amortization expense for core deposit intangibles in subsequent periods will be: (Dollars in thousands) 2021 $ 10,948 2022 7,743 2023 5,129 2024 2,658 2025 and subsequent 3,189 $ 29,667

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Deposits	Deposits at December 31, 2020 and 2019 were as follows: (Dollars in thousands) 2020 2019 Demand $ 18,014,029 $ 12,926,796 Checking with interest 10,591,687 8,284,302 Money market accounts 8,632,713 6,817,752 Savings 3,304,167 2,564,777 Time 2,889,013 3,837,609 Total deposits $ 43,431,609 $ 34,431,236
Maturities Of Time Deposits	At December 31, 2020, the scheduled maturities of time deposits were: (Dollars in thousands) Year ended December 31 2021 $ 1,844,860 2022 648,516 2023 143,272 2024 67,908 2025 42,960 Thereafter 141,497 Total time deposits $ 2,889,013

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Short-term Debt	Short-term borrowings at December 31, 2020 and 2019 are as follows: (Dollars in thousands) 2020 2019 Securities sold under customer repurchase agreements $ 641,487 $ 442,956 Notes payable to FHLB of Atlanta — 255,000 Other short-term debt — 40,277 Total short-term borrowings $ 641,487 $ 738,233
Schedule of Long-term Debt Instruments	Long-term borrowings at December 31, 2020 and 2019 include: (Dollars in thousands) 2020 2019 Fixed-to-Floating subordinated notes at 3.375% maturing March 15, 2030 $ 350,000 $ — Junior subordinated debenture at 3-month LIBOR plus 1.75% maturing June 30, 2036 88,145 88,145 Junior subordinated debenture at 3-month LIBOR plus 2.25% maturing June 15, 2034 19,588 19,588 Junior subordinated debenture at 3-month LIBOR plus 2.85% maturing April 7, 2034 10,310 10,310 Junior subordinated debentures at 3-month LIBOR plus 2.80% maturing March 30, 2034 14,433 14,433 Junior subordinated debentures at 7.00% maturing December 31, 2026 (1) 20,000 20,000 Junior subordinated debentures at 6.50% maturing October 1, 2025 (2) 7,500 7,500 Junior subordinated debentures at 7.13% called February 25, 2020 (2) — 5,000 Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032 655,175 317,191 Unsecured term loan at 1-month LIBOR plus 1.10% maturing September 5, 2022 82,125 96,425 Obligations under capitalized leases extending to December 2050 6,308 8,230 Unamortized issuance costs (3,459) — Unamortized purchase accounting adjustments (3) (1,999) (1,569) Other long-term debt 37 3,385 Total long-term obligations $ 1,248,163 $ 588,638 (1) Assumed in HomeBancorp acquisition. (2) Assumed in Biscayne BancShares acquisition. (3) At December 31, 2020, unamortized purchase accounting adjustments were $2.0 million for subordinated debentures. At December 31, 2019, unamortized purchase accounting adjustments were $1.6 million for subordinated debentures and $6 thousand for FHLB advances.
Schedule of Maturities of Long-term Debt	Long-term borrowings maturing in each of the five years subsequent to December 31, 2020 and thereafter include: (Dollars in thousands) Year ended December 31 2021 $ 10,000 2022 98,709 2023 125,500 2024 6,144 2025 7,500 Thereafter 1,000,310 Total long-term borrowings $ 1,248,163

FDIC Shared-Loss Payable (Table

FDIC Shared-Loss Payable (Tables)	12 Months Ended
	Dec. 31, 2020
FDIC Shared-Loss Receivable [Abstract]
Changes In Payable to FDIC	The following table provides changes in the FDIC shared-loss payable for the years ended December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Beginning balance $ 112,395 $ 105,618 Accretion 2,674 6,777 Payment made to the FDIC to settle shared-loss agreement (99,468) — Ending balance $ 15,601 $ 112,395

Shareholders' Equity, Dividen_2

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of Compliance with Regulatory Capital Requirements	Following is an analysis of capital ratios under Basel III guidelines for BancShares and FCB as of December 31, 2020 and 2019: December 31, 2020 December 31, 2019 (Dollars in thousands) Requirements to be well-capitalized Amount Ratio Amount Ratio BancShares Total risk-based capital 10.00 % $ 4,577,212 13.81 % $ 3,731,501 12.12 % Tier 1 risk-based capital 8.00 3,856,086 11.63 3,344,305 10.86 Common equity Tier 1 6.50 3,516,149 10.61 3,344,305 10.86 Leverage capital 5.00 3,856,086 7.86 3,344,305 8.81 FCB Total risk-based capital 10.00 4,543,496 13.72 3,837,670 12.46 Tier 1 risk-based capital 8.00 4,276,870 12.92 3,554,974 11.54 Common equity Tier 1 6.50 4,276,870 12.92 3,554,974 11.54 Leverage capital 5.00 4,276,870 8.72 3,554,974 9.38

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) included the following at December 31, 2020 and 2019: December 31, 2020 December 31, 2019 (Dollars in thousands) Accumulated Deferred Accumulated Accumulated Deferred Accumulated Unrealized gains on securities available for sale $ 102,278 $ 23,524 $ 78,754 $ 7,522 $ 1,730 $ 5,792 Unrealized gains on securities available for sale transferred from (to) held to maturity 5,399 1,242 4,157 — — — Defined benefit pension items (91,751) (21,103) (70,648) (172,098) (39,583) (132,515) Total $ 15,926 $ 3,663 $ 12,263 $ (164,576) $ (37,853) $ (126,723) The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2020 and 2019: (Dollars in thousands) Unrealized gains (losses) on securities available-for-sale (1) Unrealized gains (losses) on securities available for sale transferred to held to maturity (1)(2) Defined benefit pension items (1) Total Balance at January 1, 2019 $ (38,505) $ (71,149) $ (125,533) $ (235,187) Net unrealized gains (losses) arising during period 49,776 55,834 (15,438) 90,172 Amounts reclassified from accumulated other comprehensive loss (5,479) 15,315 8,456 18,292 Net current period other comprehensive income (loss) 44,297 71,149 (6,982) 108,464 Balance at December 31, 2019 5,792 — (132,515) (126,723) Net unrealized gains arising during period 119,357 4,538 42,367 166,262 Amounts reclassified from accumulated other comprehensive loss (46,395) (381) 19,500 (27,276) Net current period other comprehensive income 72,962 4,157 61,867 138,986 Balance at December 31, 2020 $ 78,754 $ 4,157 $ (70,648) $ 12,263 (1) All amounts are net of tax. Amounts in parentheses indicate debits. (2) Net unrealized gains (losses) represent unrealized gains and losses related to the reclassification of investment securities between categories. See Note C, Investments, for additional information. The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Net actuarial loss $ 91,751 $ 172,098
Reclassification out of Accumulated Other Comprehensive Income	The following table presents the amounts reclassified from accumulated other comprehensive income (loss) and the line item affected in the statement where net income is presented for years ended December 31, 2020 and 2019: (Dollars in thousands) Year ended December 31, 2020 Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss) (1) Affected line item in the statement where net income is presented Unrealized gains on available for sale securities $ 60,253 Realized gains on investment securities available for sale, net (13,858) Income taxes $ 46,395 Amortization of unrealized gains on securities available for sale transferred to held to maturity $ 495 Net interest income (114) Income taxes $ 381 Amortization of actuarial losses on defined benefit pension items $ (25,324) Other noninterest expense 5,824 Income taxes $ (19,500) Total reclassifications for the period $ 27,276 Year ended December 31, 2019 Details about accumulated other comprehensive (loss) income Amount reclassified from accumulated other comprehensive income (loss) (1) Affected line item in the statement where net income is presented Unrealized gains on available for sale securities $ 7,115 Realized gains on investment securities available for sale, net (1,636) Income taxes $ 5,479 Amortization of unrealized losses on securities available for sale transferred to held to maturity $ (19,889) Net interest income 4,574 Income taxes $ (15,315) Amortization of defined benefit pension items Prior service costs $ (57) Salaries and wages Actuarial losses (10,924) Other noninterest expense (10,981) Income before income taxes 2,525 Income taxes $ (8,456) Total reclassifications for the period $ (18,292) (1) Amounts in parentheses indicate debits to profit/loss.

Other Noninterest Income and _2

Other Noninterest Income and Other Noninterest Expense (Tables)	12 Months Ended
	Dec. 31, 2020
Noninterest Expense [Abstract]
Schedule of Other Operating Cost and Expense, by Component	Other noninterest expense for the years ended December 31, 2020, 2019 and 2018 included the following: (Dollars in thousands) 2020 2019 2018 Core deposit intangible amortization $ 14,255 $ 16,346 $ 17,165 Consultant expense 12,751 12,801 14,345 Advertising expense 10,010 11,437 11,650 Telecommunications expense 12,179 9,391 10,471 Other 95,922 89,308 93,432 Total other noninterest expense $ 145,117 $ 139,283 $ 147,063 Other expense consists of miscellaneous expenses including travel, postage, supplies, appraisal expense and other operational losses. Advertising expense related to non-direct response advertisements are expensed as incurred.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	At December 31, 2020, 2019 and 2018 income tax expense consisted of the following: (Dollars in thousands) 2020 2019 2018 Current tax expense Federal $ 137,162 $ 68,984 $ 95,151 State 14,532 11,095 21,523 Total current tax expense 151,694 80,079 116,674 Deferred tax (benefit) expense Federal (28,535) 50,522 (10,944) State 3,000 4,076 (2,433) Total deferred tax (benefit) expense (25,535) 54,598 (13,377) Total income tax expense $ 126,159 $ 134,677 $ 103,297
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense differed from the amounts computed by applying the statutory federal income tax rate of 21% to pretax income as a result of the following: (Dollars in thousands) 2020 2019 2018 Income taxes at federal statutory rates $ 129,755 $ 124,330 $ 105,758 Increase (reduction) in income taxes resulting from: Nontaxable income on loans, leases and investments, net of nondeductible expenses (1,581) (1,639) (1,796) Excess tax benefits of compensation 1,146 1,070 371 State and local income taxes, including any change in valuation allowance, net of federal income tax benefit 13,850 11,985 15,081 Effect of federal rate change — — (15,736) Tax credits net of amortization (5,367) (4,474) (2,891) Repayment of claim of right income (13,926) — — Other, net 2,282 3,405 2,510 Total income tax expense $ 126,159 $ 134,677 $ 103,297
Schedule of Deferred Tax Assets and Liabilities	The net deferred tax liability included the following components at December 31, 2020, and 2019: (Dollars in thousands) 2020 2019 Allowance for credit losses $ 52,293 $ 53,073 Operating lease liabilities 15,737 17,752 Executive separation from service agreements 8,989 12,334 Net operating loss carryforwards 9,545 11,085 Employee compensation 16,083 13,313 FDIC assisted transactions timing differences — 8,678 Other reserves 5,376 5,001 Other 6,898 10,698 Deferred tax asset 114,921 131,934 Accelerated depreciation 14,984 51,249 Lease financing activities 15,265 8,101 Operating lease assets 15,670 17,837 Net unrealized gain on securities included in accumulated other comprehensive loss 24,857 1,821 Net deferred loan fees and costs 13,975 11,781 Intangible assets 13,012 9,148 Security, loan and debt valuations 2,051 5,767 FDIC assisted transactions timing differences 2,393 — Pension liability 44,549 5,079 Other 10,193 15,993 Deferred tax liability 156,949 126,776 Net deferred tax (liability) asset $ (42,028) $ 5,158
Schedule of Unrecognized Tax Benefits	The following table provides a rollforward of BancShares’ gross unrecognized tax benefits, excluding interest and penalties, during the years ended December 31, 2020, 2019 and 2018: (Dollars in thousands) 2020 2019 2018 Unrecognized tax benefits at the beginning of the year $ 32,226 $ 28,255 $ 29,004 Additions (reductions) related to tax positions taken in prior year 153 (683) (1,054) Additions related to tax positions taken in current year 1,295 6,554 1,433 Settlements (1,516) — — Reductions related to lapse of statute of limitations (783) (1,900) (1,128) Unrecognized tax benefits at the end of the year $ 31,375 $ 32,226 $ 28,255

Estimated Fair Values (Tables)

Estimated Fair Values (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Estimated Fair Values For Certain Financial Assets And Financial Liabilities	For all other financial assets and financial liabilities, the carrying value is a reasonable estimate of the fair value as of December 31, 2020 and 2019. The carrying value and fair value for these assets and liabilities are equivalent because they are relatively short-term in nature and there is no interest rate or credit risk that would cause the fair value to differ from the carrying value. Cash and due from banks is classified on the fair value hierarchy as Level 1. Overnight investments, income earned not collected and accrued interest payable are considered Level 2. The table presents the carrying values and estimated fair values for financial instruments as of December 31, 2020 and 2019. December 31, 2020 December 31, 2019 (Dollars in thousands) Carrying value Fair value Carrying value Fair value Cash and due from banks $ 362,048 $ 362,048 $ 376,719 $ 376,719 Overnight investments 4,347,336 4,347,336 1,107,844 1,107,844 Investment securities available for sale 7,014,243 7,014,243 7,059,674 7,059,674 Investment securities held to maturity 2,816,982 2,838,499 30,996 30,996 Investment in marketable equity securities 91,680 91,680 82,333 82,333 Loans held for sale 124,837 124,837 67,869 67,869 Net loans and leases 32,567,661 33,298,166 28,656,355 28,878,550 Income earned not collected 145,694 145,694 123,154 123,154 Federal Home Loan Bank stock 45,392 45,392 43,039 43,039 Mortgage and other servicing rights 19,628 20,283 24,891 26,927 Deposits with no stated maturity 40,542,596 40,542,596 30,593,627 30,593,627 Time deposits 2,889,013 2,905,577 3,837,609 3,842,162 Securities sold under customer repurchase agreements 641,487 641,487 442,956 442,956 Federal Home Loan Bank borrowings 655,175 677,579 572,185 577,362 Subordinated debt 504,518 525,610 163,412 173,685 Other borrowings 88,470 89,263 148,318 149,232 FDIC shared-loss payable 15,601 15,843 112,395 114,252 Accrued interest payable 9,414 9,414 18,124 18,124
Assets And Liabilities Carried At Fair Value On A Recurring Basis	Among BancShares’ assets and liabilities, investment securities available for sale, marketable equity securities and loans held for sale are reported at their fair values on a recurring basis. For assets and liabilities carried at fair value on a recurring basis, the following table provides fair value information as of December 31, 2020 and 2019. December 31, 2020 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Assets measured at fair value Investment securities available for sale U.S. Treasury $ 499,933 $ — $ 499,933 $ — Government agency 701,391 — 701,391 — Residential mortgage-backed securities 4,438,103 — 4,438,103 — Commercial mortgage-backed securities 771,537 — 771,537 — Corporate bonds 603,279 — 286,655 316,624 Total investment securities available for sale $ 7,014,243 $ — $ 6,697,619 $ 316,624 Marketable equity securities $ 91,680 $ 32,855 $ 58,825 — Loans held for sale 124,837 — 124,837 — December 31, 2019 Fair value measurements using: Fair value Level 1 Level 2 Level 3 Assets measured at fair value Investment securities available for sale U.S. Treasury $ 409,999 $ — $ 409,999 $ — Government agency 682,772 — 682,772 — Residential mortgage-backed securities 5,267,090 — 5,267,090 — Commercial mortgage-backed securities 380,020 — 380,020 — Corporate bonds 201,566 — 131,881 69,685 State, county and municipal 118,227 — 118,227 — Total investment securities available for sale $ 7,059,674 $ — $ 6,989,989 $ 69,685 Marketable equity securities $ 82,333 $ 29,458 $ 52,875 $ — Loans held for sale 67,869 — 67,869 —
Fair Value of Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following table summarizes activity for Level 3 assets for the years ended December 31, 2020 and 2019: 2020 2019 (Dollars in thousands) Corporate bonds Corporate bonds Beginning balance $ 69,685 $ 143,226 Purchases (1) 242,595 35,993 Unrealized net gains included in other comprehensive income 2,898 3,891 Amounts included in net income (336) 174 Transfers in 1,782 — Transfers out — (112,599) Sales / Calls — (1,000) Ending balance $ 316,624 $ 69,685 (1) The year ended December 31, 2019, includes Corporate bonds of $500 thousand acquired in Entegra transaction.
Fair Value Level 3 Significant Unobservable Input Assumptions	The following table presents quantitative information about Level 3 fair value measurements for fair value on a recurring basis at December 31, 2020. (Dollars in thousands) December 31, 2020 Level 3 assets Valuation technique Significant unobservable input Fair Value Corporate bonds Indicative bid provided by broker Multiple factors, including but not limited to, current operations, financial condition, cash flows, and recently executed financing transactions related to the issuer $ 316,624
Fair Value Option	The following table summarizes the difference between the aggregate fair value and the unpaid principal balance for residential real estate loans originated for sale measured at fair value as of December 31, 2020 and 2019. December 31, 2020 (Dollars in thousands) Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 124,837 $ 118,902 $ 5,935 December 31, 2019 Fair Value Unpaid Principal Balance Difference Originated loans held for sale $ 67,869 $ 65,697 $ 2,172
Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis	For financial assets and liabilities carried at fair value on a nonrecurring basis, the following table provides fair value information as of December 31, 2020 and December 31, 2019. December 31, 2020 Fair value measurements using: (Dollars in thousands) Fair value Level 1 Level 2 Level 3 Collateral-dependent loans 11,779 — — 11,779 Other real estate remeasured during the year 40,115 — — 40,115 Mortgage servicing rights 16,966 — — 16,966 December 31, 2019 Fair value measurements using: Fair value Level 1 Level 2 Level 3 Impaired loans $ 132,336 $ — $ — $ 132,336 Other real estate remeasured during the year 38,310 — — 38,310 Mortgage servicing rights 3,757 — — 3,757

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Retirement Benefits, Description [Abstract]
Schedule of Net Funded Status	The following table provides the changes in benefit obligation and plan assets and the funded status of the Plans at December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Change in benefit obligation Projected benefit obligation at January 1 $ 990,406 $ 852,975 Service cost 14,279 12,767 Interest cost 34,197 37,260 Actuarial losses 72,080 118,964 Benefits paid (33,309) (31,560) Projected benefit obligation at December 31 1,077,653 990,406 Change in plan assets Fair value of plan assets at January 1 976,072 842,534 Actual return on plan assets 192,792 161,506 Employer contributions 100,000 3,592 Benefits paid (33,309) (31,560) Fair value of plan assets at December 31 1,235,555 976,072 Funded status at December 31 $ 157,902 $ (14,334)
Schedule of Amount Included in Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) included the following at December 31, 2020 and 2019: December 31, 2020 December 31, 2019 (Dollars in thousands) Accumulated Deferred Accumulated Accumulated Deferred Accumulated Unrealized gains on securities available for sale $ 102,278 $ 23,524 $ 78,754 $ 7,522 $ 1,730 $ 5,792 Unrealized gains on securities available for sale transferred from (to) held to maturity 5,399 1,242 4,157 — — — Defined benefit pension items (91,751) (21,103) (70,648) (172,098) (39,583) (132,515) Total $ 15,926 $ 3,663 $ 12,263 $ (164,576) $ (37,853) $ (126,723) The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2020 and 2019: (Dollars in thousands) Unrealized gains (losses) on securities available-for-sale (1) Unrealized gains (losses) on securities available for sale transferred to held to maturity (1)(2) Defined benefit pension items (1) Total Balance at January 1, 2019 $ (38,505) $ (71,149) $ (125,533) $ (235,187) Net unrealized gains (losses) arising during period 49,776 55,834 (15,438) 90,172 Amounts reclassified from accumulated other comprehensive loss (5,479) 15,315 8,456 18,292 Net current period other comprehensive income (loss) 44,297 71,149 (6,982) 108,464 Balance at December 31, 2019 5,792 — (132,515) (126,723) Net unrealized gains arising during period 119,357 4,538 42,367 166,262 Amounts reclassified from accumulated other comprehensive loss (46,395) (381) 19,500 (27,276) Net current period other comprehensive income 72,962 4,157 61,867 138,986 Balance at December 31, 2020 $ 78,754 $ 4,157 $ (70,648) $ 12,263 (1) All amounts are net of tax. Amounts in parentheses indicate debits. (2) Net unrealized gains (losses) represent unrealized gains and losses related to the reclassification of investment securities between categories. See Note C, Investments, for additional information. The following table details the amounts recognized in accumulated other comprehensive income at December 31, 2020 and 2019. (Dollars in thousands) 2020 2019 Net actuarial loss $ 91,751 $ 172,098
Schedule of Net Benefit Costs	The following table shows the components of periodic benefit cost related to the Plans and changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31, 2020, 2019 and 2018. Year ended December 31 (Dollars in thousands) 2020 2019 2018 Service cost $ 14,279 $ 12,767 $ 16,154 Interest cost 34,197 37,260 34,733 Expected return on assets (65,689) (62,590) (60,296) Amortization of prior service cost — 57 79 Amortization of net actuarial loss 25,324 10,924 13,902 Total net periodic benefit cost (income) 8,111 (1,582) 4,572 Current year actuarial (gain) loss (55,023) 20,049 32,012 Amortization of actuarial loss (25,324) (10,924) (13,902) Amortization of prior service cost — (57) (79) Net (gain) loss recognized in other comprehensive income (80,347) 9,068 18,031 Total recognized in net periodic benefit cost and other comprehensive income $ (72,236) $ 7,486 $ 22,603
Schedule of Assumptions Used	The assumptions used to determine the benefit obligations at December 31, 2020 and 2019 are as follows: 2020 2019 Discount rate 2.76 % 3.46 % Rate of compensation increase 5.60 5.60 The assumptions used to determine the net periodic benefit cost for the years ended December 31, 2020, 2019 and 2018, are as follows: 2020 2019 2018 Discount rate 3.46 % 4.38 % 3.76 % Rate of compensation increase 5.60 5.60 4.00 Expected long-term return on plan assets 7.50 7.50 7.50
Schedule of Fair Value and Allocation of Plan Assets	The fair values of pension plan assets at December 31, 2020 and 2019, by asset class are as follows: December 31, 2020 (Dollars in thousands) Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 37,913 $ 37,913 — — 0 - 5% 3 % Equity securities 30 - 70% 77 % Common and preferred stock 144,924 144,924 — — Mutual funds 559,472 559,472 — — Exchange traded funds 248,819 248,819 — — Fixed income 15 - 45% 20 % U.S. government and government agency securities 90,292 — 90,292 — Corporate bonds 154,135 — 154,135 — Total pension assets $ 1,235,555 $ 991,128 $ 244,427 $ — 100 % December 31, 2019 Market Value Quoted prices in Significant Significant Target Allocation Actual % Cash and equivalents $ 10,974 $ 10,974 $ — $ — 0 - 5% 1 % Equity securities 30 - 70% 73 % Common and preferred stock 142,157 142,157 — — Mutual funds 565,343 565,343 — — Fixed income 15 - 45% 23 % U.S. government and government agency securities 78,175 — 78,175 — Corporate bonds 122,370 — 122,370 — Mutual funds 25,288 25,288 — — Alternative investments 0 - 30% 3 % Mutual funds 31,765 31,765 — — Total pension assets $ 976,072 $ 775,527 $ 200,545 $ — 100 %
Schedule of Expected Benefit Payments	Cash Flows The following are estimated payments to pension plan participants in the indicated periods: (Dollars in thousands) Estimated Payments 2021 $ 38,660 2022 41,340 2023 43,777 2024 46,161 2025 48,343 2026-2030 269,256
Deferred Benefit Plans Liability Rollforward	The following table provides the accrued liability as of December 31, 2020 and 2019, and the changes in the accrued liability during the years then ended: (Dollars in thousands) 2020 2019 Accrued liability as of January 1 $ 45,295 $ 34,063 Liability assumed in the Biscayne Bancshares acquisition — 1,138 Liability assumed in the First South Bancorp acquisition — 1,067 Liability assumed in the Entegra acquisition — 9,738 Discount rate adjustment 1,719 1,574 Benefit expense and interest cost 3,503 2,396 Benefits paid (7,862) (4,681) Accrued liability as of December 31 $ 42,655 $ 45,295 Discount rate at December 31 2.76 % 3.46 %

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Operating and Finance Lease Assets and Liabilities	The following table presents lease assets and liabilities as of December 31, 2020 and 2019: (Dollars in thousands) Classification December 31, 2020 December 31, 2019 Assets: Operating Other assets $ 68,048 $ 77,115 Finance Premises and equipment 6,478 8,820 Total leased assets $ 74,526 $ 85,935 Liabilities: Operating Other liabilities $ 68,343 $ 76,746 Finance Other borrowings 6,308 8,230 Total lease liabilities $ 74,651 $ 84,976 The following table presents the remaining weighted average lease terms and discount rates as of December 31, 2020: Weighted average remaining lease term (years): December 31, 2020 Operating 9.2 Finance 4.0 Weighted average discount rate: Operating 3.14 % Finance 3.08
Schedule of Net Lease Cost	(Dollars in thousands) Classification 2020 2019 Lease cost: Operating lease cost (1) Occupancy expense $ 15,023 $ 16,094 Finance lease cost: Amortization of leased assets Equipment expense 2,168 1,975 Interest on lease liabilities Interest expense - Other borrowings 220 259 Variable lease cost Occupancy expense 3,231 2,394 Sublease income Occupancy expense (350) (390) Net lease cost $ 20,292 $ 20,332 (1) Operating lease cost includes short-term lease cost, which is immaterial. The following table presents supplemental cash flow information related to leases for the years ended December 31, 2020 and 2019: Year ended December 31 (Dollars in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 14,237 $ 15,703 Operating cash flows from finance leases 220 259 Financing cash flows from finance leases 1,922 1,850 Right-of-use assets obtained in exchange for new operating lease liabilities 4,595 17,837 Right-of-use assets obtained in exchange for new finance lease liabilities — 1,886
Schedule of Lease Liability Maturities	The following table presents lease liability maturities in the next five years and thereafter: (Dollars in thousands) Operating Leases Finance Leases Total 2020 $ 12,865 $ 2,159 $ 15,024 2021 11,757 1,876 13,633 2022 9,980 993 10,973 2023 8,146 617 8,763 2024 5,223 635 5,858 Thereafter 32,045 431 32,476 Total lease payments $ 80,016 $ 6,711 $ 86,727 Less: Interest 11,673 403 12,076 Present value of lease liabilities $ 68,343 $ 6,308 $ 74,651
Schedule of Lease Liability Maturities	The following table presents lease liability maturities in the next five years and thereafter: (Dollars in thousands) Operating Leases Finance Leases Total 2020 $ 12,865 $ 2,159 $ 15,024 2021 11,757 1,876 13,633 2022 9,980 993 10,973 2023 8,146 617 8,763 2024 5,223 635 5,858 Thereafter 32,045 431 32,476 Total lease payments $ 80,016 $ 6,711 $ 86,727 Less: Interest 11,673 403 12,076 Present value of lease liabilities $ 68,343 $ 6,308 $ 74,651

Transactions with Related Per_2

Transactions with Related Persons (Tables)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	For those identified as Related Persons as of December 31, 2020, the following table provides an analysis of changes in the loans outstanding during 2020 and 2019: Year ended December 31 (dollars in thousands) 2020 2019 Balance at January 1 $ 145 $ 199 New loans 19 5 Repayments (47) (59) Balance at December 31 $ 117 $ 145

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]	The following table presents the commitments to extend credit and unfunded commitments as of December 31, 2020 and 2019: (Dollars in thousands) 2020 2019 Unused commitments to extend credit $ 12,098,417 $ 10,682,378 Standby letters of credit 129,819 99,601

Parent Company Financial Stat_2

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Condensed Balance Sheets	Parent Company Condensed Balance Sheets (Dollars in thousands) December 31, 2020 December 31, 2019 Assets Cash and due from banks $ 49,716 $ 4,573 Overnight investments 1,607 2,547 Investments in marketable equity securities 91,680 82,333 Investment securities available for sale 2,010 3,015 Investment in banking subsidiaries 4,621,676 3,763,947 Investment in other subsidiaries 3,241 3,555 Due from subsidiaries 786 — Other assets 48,591 45,164 Total assets $ 4,819,307 $ 3,905,134 Liabilities and Shareholders’ Equity Subordinated debentures $ 452,350 $ 105,677 Other borrowings 128,125 201,702 Due to subsidiaries — 1,670 Other liabilities 9,564 9,901 Shareholders’ equity 4,229,268 3,586,184 Total liabilities and shareholders’ equity $ 4,819,307 $ 3,905,134
Condensed Income Statements	Parent Company Condensed Income Statements Year ended December 31 (Dollars in thousands) 2020 2019 2018 Interest and dividend income $ 3,952 $ 1,327 $ 1,362 Interest expense 16,817 7,187 5,154 Net interest loss (12,865) (5,860) (3,792) Dividends from banking subsidiaries 229,685 149,819 242,910 Marketable equity securities gains (losses), net 29,395 20,625 (7,610) Other income 574 257 347 Other operating expense 13,168 9,497 11,127 Income before income tax benefit and equity in undistributed net income of subsidiaries 233,621 155,344 220,728 Income tax expense (benefit) 879 892 (5,184) Income before equity in undistributed net income of subsidiaries 232,742 154,452 225,912 Equity in undistributed net income of subsidiaries 258,981 302,919 174,401 Net income 491,723 457,371 400,313 Less: Preferred stock dividends 14,062 — — Net income available to common shareholders $ 477,661 $ 457,371 $ 400,313
Condensed Statements of Cash Flows	Parent Company Condensed Statements of Cash Flows Year ended December 31 (Dollars in thousands) 2020 2019 2018 OPERATING ACTIVITIES Net income $ 491,723 $ 457,371 $ 400,313 Adjustments Undistributed net income of subsidiaries (258,981) (302,919) (174,401) Net amortization of premiums and discounts 824 119 88 Marketable equity securities (gains) losses, net (29,395) (20,625) 7,610 Gain on extinguishment of debt — — (160) Realized gains (losses) on investment securities available for sale, net — (20) — Net change in due to/from subsidiaries (2,456) (2,185) (381) Change in other assets (3,074) (2,001) 3,657 Change in other liabilities (694) 981 (2,595) Net cash provided by operating activities 197,947 130,721 234,131 INVESTING ACTIVITIES Net change in loans — 100,000 (100,000) Net change in overnight investments 940 2,162 14,091 Purchases of marketable equity securities (333,140) (26,166) (2,818) Proceeds from sales of marketable equity securities 352,835 56,749 9,528 Purchases of investment securities — — (6,438) Proceeds from sales, calls, and maturities of securities 1,000 3,477 9,997 Investment in subsidiaries (422,500) — — Net cash provided by (used in) investing activities (400,865) 136,222 (75,640) FINANCING ACTIVITIES Net change in short-term borrowings (40,277) 40,277 (15,000) Repayment of long-term obligations (33,300) (3,575) (1,840) Origination of long-term obligations — 165,000 — Net proceeds from subordinated notes issuance 345,849 — — Net proceeds from preferred stock issuance 339,937 — — Repurchase of common stock (333,755) (453,123) (163,095) Cash dividends paid (30,393) (18,137) (16,779) Net cash provided by (used in) financing activities 248,061 (269,558) (196,714) Net change in cash 45,143 (2,615) (38,223) Cash balance at beginning of year 4,573 7,188 45,411 Cash balance at end of year $ 49,716 $ 4,573 $ 7,188 CASH PAYMENTS FOR: Interest $ 13,338 $ 7,187 $ 5,154 Income taxes 106,618 78,345 73,806

Accounting Policies and Basis_3

Accounting Policies and Basis of Presentation - Summary of Significant Accounting Policies (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)branchvotereportablesegmentstate	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Property, Plant and Equipment [Line Items]
Number of branches | branch	542
Number of states in which entity operates | state	19
Number of reportable segments | reportablesegment	1
Non-marketable securities	$ 11,600,000		$ 12,500,000
FHLB restricted stock	45,400,000		43,000,000
Amortization Method Qualified Affordable Housing Project Investments	$ 163,900,000		167,800,000
Allowance for credit loss, forecast period	2 years
Financing receivable, allowance for credit loss, expected, COVID-19	$ 0
Financing receivable, collateral dependent, threshold for loans individually evaluated for impairment	500,000
Reserve for unfunded commitments	12,800,000
Goodwill, impairment loss	0
Increase (decrease) in allowance for credit loss	224,314,000		225,141,000	$ 223,712,000	$ 221,893,000
Retained earnings	3,867,252,000		3,658,197,000
Debt securities, held-to-maturity, allowance for credit loss	0
Cumulative Effect, Period of Adoption, Adjustment
Property, Plant and Equipment [Line Items]
Increase (decrease) in allowance for credit loss		$ (37,900,000)	$ (37,924,000)
Cumulative Effect, Period of Adoption, Adjustment | Cumulative effect of adoption of ASC 326
Property, Plant and Equipment [Line Items]
Reserve for unfunded commitments		8,900,000
Increase (decrease) in allowance for credit loss		(37,900,000)
Retained earnings		36,900,000
Debt securities, held-to-maturity, allowance for credit loss		0
Cumulative Effect, Period of Adoption, Adjustment | Cumulative effect of adoption of ASC 326 | Non-PCD Loans
Property, Plant and Equipment [Line Items]
Increase (decrease) in allowance for credit loss		(56,900,000)
Cumulative Effect, Period of Adoption, Adjustment | Cumulative effect of adoption of ASC 326 | PCD Loans
Property, Plant and Equipment [Line Items]
Increase (decrease) in allowance for credit loss		$ 19,000,000
Visa Class B Common Stock
Property, Plant and Equipment [Line Items]
Investment owned (in shares) | shares			354
Investment owned, fair value			$ 0
Held-to-maturity Securities
Property, Plant and Equipment [Line Items]
Allowance for credit loss, expected	$ 0
Class A Common Stock
Property, Plant and Equipment [Line Items]
Votes per share of common stock | vote	1
Class B Common Stock
Property, Plant and Equipment [Line Items]
Votes per share of common stock | vote	16
Minimum
Property, Plant and Equipment [Line Items]
Useful life (years)	5 years
Operating lease renewal term (years)	1 year
Maximum
Property, Plant and Equipment [Line Items]
Useful life (years)	12 years
Operating lease renewal term (years)	25 years

Business Combinations - Narrati

Business Combinations - Narrative (Details) $ / shares in Units, $ in Thousands	Oct. 15, 2020director$ / shares	Feb. 01, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)$ / shares	Dec. 31, 2019USD ($)$ / shares	Dec. 31, 2018USD ($)	May 01, 2019USD ($)	Apr. 02, 2019USD ($)	Nov. 01, 2018USD ($)	Oct. 02, 2018USD ($)	May 01, 2018USD ($)
Business Acquisition [Line Items]
Number of directors of new entity | director	14
Goodwill				$ 350,298	$ 349,398	$ 236,347
Merger-related expenses				$ 17,450	17,166	$ 6,462
Disposal group, premium for deposits sold, percent				8.00%
Deposits				$ 43,431,609	$ 34,431,236
Class A Common Stock
Business Acquisition [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 1			$ 1	$ 1
CIT Group Inc.
Business Acquisition [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Number of directors of new entity | director	3
CIT Group Inc. | BancShares Class A Common Stock
Business Acquisition [Line Items]
Common stock, conversion ratio	0.06200
CIT Group Inc. | Fixed-To-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series A
Business Acquisition [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01
CIT Group Inc. | Non-Cumulative Perpetual Preferred Stock, Series B
Business Acquisition [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01
Preferred Stock, dividend rate, percentage	5.625%
CIT Group Inc. | Series B Preferred Stock
Business Acquisition [Line Items]
Common stock, conversion ratio	1
CIT Group Inc. | Series C Preferred Stock
Business Acquisition [Line Items]
Common stock, conversion ratio	1
BancShares
Business Acquisition [Line Items]
Number of directors of new entity | director	11
Community Financial Holding Co. Inc.
Business Acquisition [Line Items]
Payments to acquire businesses		$ 2,300
Total assets acquired		221,400
Non-PCI loans acquired		110,600
PCI loans acquired		23,400
Business combination, recognized identifiable assets acquired and liabilities assumed, allowance for credit losses		1,200
Intangible assets		536
Total liabilities assumed		219,766
Deposits		209,340
Goodwill		$ 686
Merger-related expenses				$ 3,500
Interest and fee income, loans, consumer and commercial			$ 5,300
Entegra Financial
Business Acquisition [Line Items]
Total assets acquired				1,680,000
Non-PCI loans acquired											$ 953,700
PCI loans acquired											$ 77,500
Total liabilities assumed				1,510,000
Deposits				1,330,000
Goodwill				52,600
Business combination, measurement period adjustment, amount				214
Merger-related expenses				7,800	$ 5,400
Interest and fee income, loans, consumer and commercial				40,300	0
Core deposit intangible acquired				4,500
Disposal group, including discontinued operation, accounts, notes and loans receivable				110,100
Disposal group, including discontinued operation, property, plant and equipment				2,100
Disposal group, deposits sold				184,800
First South Bancorp
Business Acquisition [Line Items]
Total assets acquired							$ 239,200
Non-PCI loans acquired										$ 162,800
PCI loans acquired										$ 16,400
Total liabilities assumed				0	1,067		215,600
Deposits							207,600
Goodwill							13,900
Merger-related expenses				0	4,100
Interest and fee income, loans, consumer and commercial				5,700	6,100
Core deposit intangible acquired							$ 2,300
Biscayne Bancshares
Business Acquisition [Line Items]
Total assets acquired								$ 1,030,000
Non-PCI loans acquired									$ 850,400
PCI loans acquired									$ 13,000
Total liabilities assumed				0	1,138			956,800
Goodwill								46,500
Merger-related expenses				847	5,800
Interest and fee income, loans, consumer and commercial				$ 37,800	$ 33,800
Core deposit intangible acquired								4,700
Deposits								$ 786,500

Business Combinations - Schedul

Business Combinations - Schedule of Identifiable Assets Acquired and Liability Assumed (Details) - USD ($) $ in Thousands	Feb. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill recorded for Community Financial		$ 350,298	$ 349,398	$ 236,347
Community Financial Holding Co. Inc.
Business Acquisition [Line Items]
Purchase price	$ 2,320
Cash and due from banks	1,085
Overnight investments	35,129
Investment securities	30,146
Loans	133,989
Premises and equipment	7,624
Other real estate owned	9,813
Income earned not collected	558
Intangible assets	536
Other assets	2,520
Total assets acquired	221,400
Deposits	209,340
Borrowings	9,925
Other liabilities	501
Total liabilities assumed	219,766
Fair value of net assets acquired	1,634
Goodwill recorded for Community Financial	$ 686

Investments (Aggregate Values a

Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment securities available for sale
Investment securities available for sale, cost	$ 6,911,965	$ 7,052,152
Investment securities available for sale, gross unrealized gains	111,189	25,341
Investment securities available for sale, gross unrealized losses	8,911	17,819
Allowance for credit losses	0
Investment securities available for sale, fair value	7,014,243	7,059,674
Investment in marketable equity securities, cost	84,837	59,262
Investment in marketable equity securities, gross unrealized gains	8,654	23,304
Investment in marketable equity securities, gross unrealized losses	1,811	233
Investment in marketable equity securities, fair value	91,680	82,333
Investment securities held to maturity
Investment securities held to maturity, cost	2,816,982	30,996
Investment securities held to maturity, gross unrealied gains	21,573
Investment securities held to maturity, gross unrealized losses	56
Debt securities, held-to-maturity, allowance for credit loss	0
Investment securities held to maturity, fair value	2,838,499	30,996
Total investment securities, cost	9,813,784	7,142,410
Total investment securities, gross unrealized gains	141,416	48,645
Total investment securities, fair value	10,778	18,052
Debt Securities, Available-for-sale, Held-to-maturity and Equity Securities, Allowance for Credit Losses	0
Total investment securities, gross unrealized losses	9,944,422	7,173,003
U. S. Treasury
Investment securities available for sale
Investment securities available for sale, cost	499,832	409,397
Investment securities available for sale, gross unrealized gains	101	602
Investment securities available for sale, gross unrealized losses	0	0
Allowance for credit losses	0
Investment securities available for sale, fair value	499,933	409,999
Government Agency
Investment securities available for sale
Investment securities available for sale, cost	706,241	684,085
Investment securities available for sale, gross unrealized gains	723	928
Investment securities available for sale, gross unrealized losses	5,573	2,241
Allowance for credit losses	0
Investment securities available for sale, fair value	701,391	682,772
Residential Mortgage Backed Securities
Investment securities available for sale
Investment securities available for sale, cost	4,369,130	5,269,060
Investment securities available for sale, gross unrealized gains	70,283	13,417
Investment securities available for sale, gross unrealized losses	1,310	15,387
Allowance for credit losses	0
Investment securities available for sale, fair value	4,438,103	5,267,090
Investment securities held to maturity
Investment securities held to maturity, cost	1,877,692	0
Investment securities held to maturity, gross unrealied gains	17,689
Investment securities held to maturity, gross unrealized losses	0
Debt securities, held-to-maturity, allowance for credit loss	0
Investment securities held to maturity, fair value	1,895,381
Commercial Mortgage Backed Securities
Investment securities available for sale
Investment securities available for sale, cost	745,892	373,105
Investment securities available for sale, gross unrealized gains	25,645	6,974
Investment securities available for sale, gross unrealized losses	0	59
Allowance for credit losses	0
Investment securities available for sale, fair value	771,537	380,020
Investment securities held to maturity
Investment securities held to maturity, cost	937,034	0
Investment securities held to maturity, gross unrealied gains	3,884
Investment securities held to maturity, gross unrealized losses	56
Debt securities, held-to-maturity, allowance for credit loss	0
Investment securities held to maturity, fair value	940,862
Corporate Bonds
Investment securities available for sale
Investment securities available for sale, cost	590,870	198,278
Investment securities available for sale, gross unrealized gains	14,437	3,420
Investment securities available for sale, gross unrealized losses	2,028	132
Allowance for credit losses	0
Investment securities available for sale, fair value	603,279	201,566
US States and Political Subdivisions Debt Securities
Investment securities available for sale
Investment securities available for sale, cost		118,227
Investment securities available for sale, gross unrealized gains		0
Investment securities available for sale, gross unrealized losses		0
Investment securities available for sale, fair value		118,227
Other Debt Obligations
Investment securities held to maturity
Investment securities held to maturity, cost	2,256	30,996
Investment securities held to maturity, gross unrealied gains	0	0
Investment securities held to maturity, gross unrealized losses	0	0
Debt securities, held-to-maturity, allowance for credit loss	0
Investment securities held to maturity, fair value	$ 2,256	$ 30,996

Investments (Narrative) (Detail

Investments (Narrative) (Details)	Nov. 01, 2020USD ($)	Nov. 01, 2019USD ($)	Dec. 31, 2020USD ($)investment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Schedule of Investments [Line Items]
Investment securities available for sale transferred to held to maturity fair value, net of tax	$ 5,900,000		$ 5,894,000	$ 72,512,000	$ (109,507,000)
Reclassification of unrealized losses, net of tax	4,500,000		4,157,000	71,149,000	$ (71,149,000)
Interest receivable, available-for-sale debt securities			17,600,000
Interest receivable, held-to-maturity debt securities			5,400,000
Debt securities, accrued interest, writeOff			$ 0
Number of investments in continuous unrealized loss position for more than twelve months | investment			39
Unrealized losses related to marketability of securities or issuers ability to honor redemption obligations			$ 0
Investment value deemed to be OTTI			0
Investment securities, aggregate carrying value, pledged as collateral			4,640,000,000	$ 3,930,000,000
Debt securities, held-to-maturity, nonaccrual			0
Debt securities, held-to-maturity, past due			$ 0
Mortgage Backed Securities
Schedule of Investments [Line Items]
Investment securities available for sale transferred to held to maturity amortized cost	1,460,000,000
Investment securities available for sale transferred to held to maturity fair value	$ 1,470,000,000
Weighted average contractual maturity (years)	18 years
Accounting Standards Update 2019-04 | Mortgage Backed Securities
Schedule of Investments [Line Items]
Investment securities available for sale transferred to held to maturity fair value		$ 2,150,000,000
Mortgage backed securities, held-to-maturity, transferred to available-for-sale		2,080,000,000
Investment securities available for sale transferred to held to maturity fair value, net of tax		72,500,000
Reclassification of unrealized losses, net of tax		$ 55,800,000

Investments (Maturity Informati

Investments (Maturity Information) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment securities available for sale
Total investment securities available for sale, cost	$ 6,911,965	$ 7,052,152
Investment securities available for sale	7,014,243	7,059,674
Investment securities held to maturity
Maturing in one year or less, cost	1,507	30,746
Maturing in one year or less, fair value	1,507	30,746
Maturing in one through five years, cost	749	250
Maturing in one through five years, fair value	749	250
Investment securities held to maturity, cost	2,816,982	30,996
Total investment securities held to maturity, fair value	2,838,499	30,996
Debt Securities
Investment securities available for sale
Maturing in one year or less, cost	500,846	406,325
Maturing in one through five years, cost	72,565	24,496
Maturing in five through ten years, cost	508,320	185,209
Maturing in over ten years, cost	8,971	109,872
Maturing in one year or less, fair value	500,954	406,927
Maturing in one through five years, fair value	73,881	24,971
Maturing in five through ten years, fair value	519,570	187,868
Maturing in over ten years, fair value	8,807	110,026
Government Agency
Investment securities available for sale
Total investment securities available for sale, cost	706,241	684,085
Investment securities available for sale	701,391	682,772
Residential Mortgage Backed Securities
Investment securities available for sale
Total investment securities available for sale, cost	4,369,130	5,269,060
Investment securities available for sale	4,438,103	5,267,090
Investment securities held to maturity
Investment securities held to maturity, cost	1,877,692	0
Investment securities held to maturity, fair value	1,895,381	0
Total investment securities held to maturity, fair value	1,895,381
Commercial Mortgage Backed Securities
Investment securities available for sale
Total investment securities available for sale, cost	745,892	373,105
Investment securities available for sale	771,537	380,020
Investment securities held to maturity
Investment securities held to maturity, cost	937,034	0
Investment securities held to maturity, fair value	940,862	$ 0
Total investment securities held to maturity, fair value	$ 940,862

Investments (Securities Gains (

Investments (Securities Gains (Losses)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments [Abstract]
Gross gains on retirement/sales of investment securities available for sale	$ 60,932	$ 8,993	$ 353
Gross losses on sales of investment securities available for sale	(679)	(1,878)	(2)
Realized gains on investment securities available for sale, net	$ 60,253	$ 7,115	$ 351

Investments (Realized and Unrea

Investments (Realized and Unrealized Gains/Losses on Marketable Equity Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments [Abstract]
Marketable equity securities gains (losses), net	$ 29,395	$ 20,625	$ (7,610)
Less net gains recognized on marketable equity securities sold	44,550	16,344	1,190
Unrealized (losses) gains recognized on marketable equity securities held	$ (15,155)	$ 4,281	$ (8,800)

Investments (Unrealized Losses)

Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment securities available for sale:
Less than 12 months, fair value	$ 760,153	$ 2,778,014
Less than 12 months, unrealized losses	6,466	16,025
Longer than 12 months, fair value	351,841	332,953
Longer than 12 months, unrealized losses	2,445	1,794
Total fair value	1,111,994	3,110,967
Total unrealized losses	8,911	17,819
Government Agency
Investment securities available for sale:
Less than 12 months, fair value	268,622	347,081
Less than 12 months, unrealized losses	3,197	1,827
Longer than 12 months, fair value	328,777	63,947
Longer than 12 months, unrealized losses	2,376	414
Total fair value	597,399	411,028
Total unrealized losses	5,573	2,241
Residential Mortgage Backed Securities
Investment securities available for sale:
Less than 12 months, fair value	433,816	2,387,293
Less than 12 months, unrealized losses	1,241	14,016
Longer than 12 months, fair value	23,064	264,257
Longer than 12 months, unrealized losses	69	1,371
Total fair value	456,880	2,651,550
Total unrealized losses	1,310	15,387
Commercial Mortgage Backed Securities
Investment securities available for sale:
Less than 12 months, fair value		35,926
Less than 12 months, unrealized losses		59
Longer than 12 months, fair value		0
Longer than 12 months, unrealized losses		0
Total fair value		35,926
Total unrealized losses		59
Corporate Bonds
Investment securities available for sale:
Less than 12 months, fair value	57,715	7,714
Less than 12 months, unrealized losses	2,028	123
Longer than 12 months, fair value	0	4,749
Longer than 12 months, unrealized losses	0	9
Total fair value	57,715	12,463
Total unrealized losses	$ 2,028	$ 132

Loans and Leases (Narrative) (D

Loans and Leases (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Financing Receivable, Recorded Investment [Line Items]
Loans held for sale	$ 124,800	$ 67,900
Proceeds from Sale of Loans Receivable	1,050,000	756,000
Gain on sale of mortgage loans		300
Net deferred fees on non-PCI loans	50,200	900
Nonaccruing	191,483		$ 168,717
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining	19,500	30,900
Loans and leases greater than 90 days and accruing	5,862
SBA-PPP
Financing Receivable, Recorded Investment [Line Items]
Net deferred fees on non-PCI loans	41,100
Loans Held For Sale
Financing Receivable, Recorded Investment [Line Items]
Proceeds from Sale of Loans Receivable		731,800
Portfolio Loans
Financing Receivable, Recorded Investment [Line Items]
Proceeds from Sale of Loans Receivable	7,600	24,200
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccruing		114,946
Loans and leases greater than 90 days and accruing		3,291
Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccruing	43,322	42,407	42,407
Loans and leases greater than 90 days and accruing	4,312	1,094
PCD Loans
Financing Receivable, Recorded Investment [Line Items]
Nonaccruing	54,939		$ 53,771
Loans and leases greater than 90 days and accruing	355
Financing Receivable, Recorded Investment, Nonaccrual Status, Remaining Discount	45,300	88,200
Medical and Dental
Financing Receivable, Recorded Investment [Line Items]
Loans in the medical, dental or related field	$ 5,540,000	$ 5,160,000
Medical, dental or related fields percentage of total loans and leases	16.90%	17.90%
Federal Home Loan Bank of Atlanta
Financing Receivable, Recorded Investment [Line Items]
Loans Pledged as Collateral	$ 12,157,153	$ 9,407,688
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	8,637,844	6,574,636
Advances from Federal Home Loan Banks	652,675	563,690
Federal Home Loan Bank Advances, Current Borrowing Capacity	7,985,169	6,010,946
Federal Reserve Bank
Financing Receivable, Recorded Investment [Line Items]
Loans Pledged as Collateral	4,104,866	3,684,919
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	3,321,762	2,981,712
Federal Reserve Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	$ 3,321,762	$ 2,981,712

Loans and Leases (Loans and Lea

Loans and Leases (Loans and Leases Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and leases, not acquired in a transfer accounted for as debt securities	$ 32,329,093	$ 28,322,780
PCI Loans	462,882	558,716
Total loans and leases	32,791,975	28,881,496
Commercial
Loans and leases, not acquired in a transfer accounted for as debt securities	22,558,060	18,552,002
Commercial | Construction and land development
Loans and leases, not acquired in a transfer accounted for as debt securities	985,424	1,013,454
Commercial | Mortgage
Loans and leases, not acquired in a transfer accounted for as debt securities		12,282,635
Commercial | Commercial and industrial
Loans and leases, not acquired in a transfer accounted for as debt securities	5,013,644	4,403,792
Commercial | Other commercial real estate
Loans and leases, not acquired in a transfer accounted for as debt securities		542,028
Commercial | Other
Loans and leases, not acquired in a transfer accounted for as debt securities		310,093
Commercial | Mortgage Receivable, Owner Occupied
Loans and leases, not acquired in a transfer accounted for as debt securities	11,165,012
Commercial | Mortgage Receivable, Non-Owner Occupied
Loans and leases, not acquired in a transfer accounted for as debt securities	2,987,689
Commercial | SBA-PPP
Loans and leases, not acquired in a transfer accounted for as debt securities	2,406,291
Noncommercial
Loans and leases, not acquired in a transfer accounted for as debt securities		9,770,778
Noncommercial | Construction and land development
Loans and leases, not acquired in a transfer accounted for as debt securities		357,385
Noncommercial | Mortgage
Loans and leases, not acquired in a transfer accounted for as debt securities		5,293,917
Noncommercial | Revolving mortgage
Loans and leases, not acquired in a transfer accounted for as debt securities		2,339,072
Noncommercial | Consumer
Loans and leases, not acquired in a transfer accounted for as debt securities		$ 1,780,404
Consumer Portfolio Segment
Loans and leases, not acquired in a transfer accounted for as debt securities	9,771,033
Consumer Portfolio Segment | Construction and land development
Loans and leases, not acquired in a transfer accounted for as debt securities	348,123
Consumer Portfolio Segment | Residential Mortgage
Loans and leases, not acquired in a transfer accounted for as debt securities	5,561,686
Consumer Portfolio Segment | Revolving Mortgage
Loans and leases, not acquired in a transfer accounted for as debt securities	2,052,854
Consumer Portfolio Segment | Consumer Auto Loan
Loans and leases, not acquired in a transfer accounted for as debt securities	1,255,402
Consumer Portfolio Segment | Consumer Loan, Other
Loans and leases, not acquired in a transfer accounted for as debt securities	$ 552,968

Loans and Leases (Aging Of The

Loans and Leases (Aging Of The Outstanding Loans and Leases By Class Excluding Loans Impaired At Acquisition Date) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 245,485	$ 272,770
Current	32,546,490	28,608,726
Total loans and leases	32,791,975	28,881,496
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	22,558,060	18,836,331
Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	985,424
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,013,644
Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	11,165,012
Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,987,689
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		9,879,384
Total loans and leases	9,771,033	10,045,165
Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	348,123
Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,561,686
Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,052,854
Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,255,402
Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	552,968
Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		74,146
Current		18,477,856
Total loans and leases		18,552,002
Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,086	6,043
Current	982,338	1,007,411
Total loans and leases	985,424	1,013,454
Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		37,482
Current		12,245,153
Total loans and leases		12,282,635
Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		1,890
Current		540,138
Total loans and leases		542,028
Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	20,617	28,143
Current	4,993,027	4,375,649
Total loans and leases	5,013,644	4,403,792
Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0
Current	2,406,291
Total loans and leases	2,406,291
Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	67,117	588
Current	22,490,943	309,505
Total loans and leases	22,558,060	310,093
Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	25,071
Current	11,139,941
Total loans and leases	11,165,012
Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18,343
Current	2,969,346
Total loans and leases	2,987,689
Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	122,944	132,389
Current	9,648,089	9,638,389
Total loans and leases	9,771,033	9,770,778
Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,339	2,992
Current	346,784	354,393
Total loans and leases	348,123	357,385
Non-PCI Loans | Consumer Portfolio Segment | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		5,205,380
Total loans and leases		5,293,917
Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	83,272	88,537
Current	5,478,414	5,205,380
Total loans and leases	5,561,686	5,293,917
Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	22,018	23,062
Current	2,030,836	2,316,010
Total loans and leases	2,052,854	2,339,072
Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9,736
Current	1,245,666
Total loans and leases	1,255,402
Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,579
Current	546,389
Total loans and leases	552,968
Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		17,798
Current		1,762,606
Total loans and leases		1,780,404
PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	55,424	66,235
Current	407,458	492,481
Total loans and leases	462,882	558,716
PCD Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		284,329
PCD Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		240,995
Total loans and leases		274,387
30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	121,499	136,220
30-59 days past due | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		80,790
30-59 days past due | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	932
30-59 days past due | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	43,218
30-59 days past due | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	11,977
30-59 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	6,825
30-59 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	3,610
30-59 days past due | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		42,716
30-59 days past due | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	956	3,146
30-59 days past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		20,389
30-59 days past due | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		861
30-59 days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,532	18,269
30-59 days past due | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0
30-59 days past due | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	36,615	51
30-59 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,757
30-59 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12,370
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	66,562	67,026
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	932	977
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		45,839
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	43,218	45,839
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11,977	9,729
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,825
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,610
30-59 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		10,481
30-59 days past due | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18,322	26,478
Total loans and leases	18,322
30-59 days past due | PCD Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		13,764
60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	26,043	51,058
60-89 days past due | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		31,329
60-89 days past due | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	77
60-89 days past due | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	8,364
60-89 days past due | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,626
60-89 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,835
60-89 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,464
60-89 days past due | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		14,553
60-89 days past due | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	527	195
60-89 days past due | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		8,774
60-89 days past due | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		331
60-89 days past due | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,842	4,842
60-89 days past due | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0
60-89 days past due | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,601	411
60-89 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,232
60-89 days past due | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,366	25,721
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	77	218
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		18,289
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,364	18,289
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,626	3,468
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,835
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,464
60-89 days past due | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3,746
60-89 days past due | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,076	10,784
Total loans and leases	6,076
60-89 days past due | PCD Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		5,608
90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	97,943	85,492
90 days or greater | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		53,662
90 days or greater | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	330
90 days or greater | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	31,690
90 days or greater | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	7,415
90 days or greater | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,076
90 days or greater | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	1,505
90 days or greater | Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		16,877
90 days or greater | Non-PCI Loans | Commercial | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,603	2,702
90 days or greater | Non-PCI Loans | Commercial | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		8,319
90 days or greater | Non-PCI Loans | Commercial | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		698
90 days or greater | Non-PCI Loans | Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,243	5,032
90 days or greater | Non-PCI Loans | Commercial | SBA-PPP
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0
90 days or greater | Non-PCI Loans | Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	24,901	126
90 days or greater | Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,082
90 days or greater | Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,973
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	42,016	39,642
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	330	1,797
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		24,409
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	31,690	24,409
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,415	9,865
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,076
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,505
90 days or greater | Non-PCI Loans | Consumer Portfolio Segment | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3,571
90 days or greater | PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	31,026	28,973
Total loans and leases	$ 31,026
90 days or greater | PCD Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		$ 14,020

Loans and Leases (Recorded Inve

Loans and Leases (Recorded Investment, By Class, In Loans And Leases On Nonaccrual Status And Loans And Leases Greater Than 90 Days Past Due And Still Accruing) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 191,483	$ 168,717
Loans and leases greater than 90 days and accruing	5,862
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			$ 114,946
Loans and leases greater than 90 days and accruing			3,291
Non-PCI Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	43,322	42,407	42,407
Loans and leases greater than 90 days and accruing	4,312		1,094
Non-PCI Loans | Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	1,661	4,281	4,281
Loans and leases greater than 90 days and accruing	0		0
Non-PCI Loans | Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			29,733
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	10,626	7,685	7,365
Loans and leases greater than 90 days and accruing	540		1,094
Non-PCI Loans | Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			708
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			320
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Commercial | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	23,103	24,476
Loans and leases greater than 90 days and accruing	3,625
Non-PCI Loans | Commercial | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	7,932	5,965
Loans and leases greater than 90 days and accruing	147
Non-PCI Loans | Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	93,222	72,539	72,539
Loans and leases greater than 90 days and accruing	1,195		2,197
Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	652	2,828	2,828
Loans and leases greater than 90 days and accruing	0		0
Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	66,345	44,357	44,357
Loans and leases greater than 90 days and accruing	0		45
Non-PCI Loans | Consumer Portfolio Segment | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			22,411
Loans and leases greater than 90 days and accruing			0
Non-PCI Loans | Consumer Portfolio Segment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing			2,943
Loans and leases greater than 90 days and accruing			$ 2,152
Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	22,236	22,411
Loans and leases greater than 90 days and accruing	0
Non-PCI Loans | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	3,166	2,145
Loans and leases greater than 90 days and accruing	0
Non-PCI Loans | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	823	798
Loans and leases greater than 90 days and accruing	1,195
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	54,939	53,771
Loans and leases greater than 90 days and accruing	355
PCD Loans | Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccruing	$ 24,900	$ 47,000

Loans and Leases (Composition o

Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Rating) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 32,791,975	$ 28,881,496
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	8,459,531
2019	4,217,219
2018	2,787,346
2017	2,053,335
2016	1,647,878
Prior	2,238,335
Revolving	1,147,519
Revolving converted to term loans	6,897
Total loans and leases	22,558,060	18,836,331
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	342,658
2019	341,862
2018	198,300
2017	56,118
2016	23,977
Prior	11,387
Revolving	11,122
Revolving converted to term loans	0
Total loans and leases	985,424
Commercial | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	3,200,021
2019	2,240,919
2018	1,671,722
2017	1,334,727
2016	1,081,293
Prior	1,521,016
Revolving	115,109
Revolving converted to term loans	205
Total loans and leases	11,165,012
Commercial | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	868,982
2019	629,426
2018	401,226
2017	342,372
2016	302,018
Prior	410,223
Revolving	33,442
Revolving converted to term loans	0
Total loans and leases	2,987,689
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,641,579
2019	1,005,012
2018	516,098
2017	320,118
2016	240,590
Prior	295,709
Revolving	987,846
Revolving converted to term loans	6,692
Total loans and leases	5,013,644
Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		18,306,067
Commercial | Pass | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	342,183
2019	341,233
2018	190,429
2017	50,776
2016	23,969
Prior	11,306
Revolving	10,969
Revolving converted to term loans	0
Total loans and leases	970,865
Commercial | Pass | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	3,183,467
2019	2,201,165
2018	1,625,141
2017	1,301,412
2016	1,049,858
Prior	1,454,020
Revolving	101,556
Revolving converted to term loans	133
Total loans and leases	10,916,752
Commercial | Pass | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	865,514
2019	609,975
2018	378,136
2017	331,800
2016	282,810
Prior	391,517
Revolving	32,149
Revolving converted to term loans	0
Total loans and leases	2,891,901
Commercial | Pass | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,620,622
2019	983,852
2018	504,463
2017	310,468
2016	234,735
Prior	286,996
Revolving	899,978
Revolving converted to term loans	5,520
Total loans and leases	4,846,634
Commercial | Pass | SBA-PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,406,291
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	0
Revolving converted to term loans	0
Total loans and leases	2,406,291
Commercial | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		211,156
Commercial | Special mention | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	246
2019	0
2018	6,421
2017	5,342
2016	0
Prior	0
Revolving	153
Revolving converted to term loans	0
Total loans and leases	12,162
Commercial | Special mention | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	6,274
2019	20,702
2018	36,739
2017	12,387
2016	17,699
Prior	25,693
Revolving	5,115
Revolving converted to term loans	72
Total loans and leases	124,681
Commercial | Special mention | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	569
2019	905
2018	10,794
2017	1,808
2016	5,121
Prior	3,279
Revolving	483
Revolving converted to term loans	0
Total loans and leases	22,959
Commercial | Special mention | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	3,146
2019	17,065
2018	7,265
2017	5,393
2016	3,307
Prior	4,912
Revolving	9,152
Revolving converted to term loans	189
Total loans and leases	50,429
Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		246,867
Commercial | Substandard | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	229
2019	629
2018	1,450
2017	0
2016	8
Prior	81
Revolving	0
Revolving converted to term loans	0
Total loans and leases	2,397
Commercial | Substandard | Mortgage Receivable, Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	10,280
2019	19,052
2018	9,842
2017	20,928
2016	13,736
Prior	41,303
Revolving	8,438
Revolving converted to term loans	0
Total loans and leases	123,579
Commercial | Substandard | Mortgage Receivable, Non-Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,899
2019	18,546
2018	12,296
2017	8,764
2016	14,087
Prior	15,427
Revolving	810
Revolving converted to term loans	0
Total loans and leases	72,829
Commercial | Substandard | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	17,811
2019	4,095
2018	4,370
2017	4,257
2016	2,548
Prior	3,801
Revolving	22,384
Revolving converted to term loans	983
Total loans and leases	60,249
Commercial | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		68,581
Commercial | Ungraded | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	56,332
Revolving converted to term loans	0
Total loans and leases	56,332
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,679,097
2019	1,444,947
2018	929,030
2017	728,918
2016	536,569
Prior	951,150
Revolving	2,339,505
Revolving converted to term loans	161,817
Total loans and leases	9,771,033	10,045,165
Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	215,112
2019	86,127
2018	24,981
2017	10,648
2016	6,093
Prior	2,637
Revolving	2,525
Revolving converted to term loans	0
Total loans and leases	348,123
Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,885,273
2019	987,802
2018	671,657
2017	605,545
2016	476,855
Prior	909,361
Revolving	25,193
Revolving converted to term loans	0
Total loans and leases	5,561,686
Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	1,891,037
Revolving converted to term loans	161,817
Total loans and leases	2,052,854
Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	524,393
2019	343,683
2018	221,383
2017	105,530
2016	50,627
Prior	9,786
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,255,402
Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	54,319
2019	27,335
2018	11,009
2017	7,195
2016	2,994
Prior	29,366
Revolving	420,750
Revolving converted to term loans	0
Total loans and leases	552,968
Consumer And PCD Portfolio Segments
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	11,172,270
2019	5,690,922
2018	3,749,427
2017	2,812,829
2016	2,215,777
Prior	3,458,369
Revolving	3,500,512
Revolving converted to term loans	191,869
Total loans and leases	32,791,975
PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	33,642
2019	28,756
2018	33,051
2017	30,576
2016	31,330
Prior	268,884
Revolving	13,488
Revolving converted to term loans	23,155
Total loans and leases	462,882	558,716
PCD Loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		284,329
PCD Loans | Commercial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		148,412
PCD Loans | Commercial | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		44,290
PCD Loans | Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		87,970
PCD Loans | Commercial | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		0
PCD Loans | Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases		$ 274,387
Current | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	215,112
2019	85,707
2018	24,860
2017	10,269
2016	6,093
Prior	2,218
Revolving	2,525
Revolving converted to term loans	0
Total loans and leases	346,784
Current | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	1,882,683
2019	978,298
2018	655,798
2017	596,309
2016	461,719
Prior	878,634
Revolving	24,973
Revolving converted to term loans	0
Total loans and leases	5,478,414
Current | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	1,879,968
Revolving converted to term loans	150,868
Total loans and leases	2,030,836
Current | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	521,719
2019	340,594
2018	219,597
2017	104,280
2016	49,872
Prior	9,604
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,245,666
Current | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	53,842
2019	27,117
2018	10,911
2017	7,159
2016	2,980
Prior	29,336
Revolving	415,044
Revolving converted to term loans	0
Total loans and leases	546,389
Current | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	31,475
2019	25,425
2018	27,183
2017	27,955
2016	28,995
Prior	232,186
Revolving	13,212
Revolving converted to term loans	21,027
Total loans and leases	407,458
30-59 days past due | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	420
2018	121
2017	370
2016	0
Prior	21
Revolving	0
Revolving converted to term loans	0
Total loans and leases	932
30-59 days past due | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,278
2019	4,573
2018	11,463
2017	3,772
2016	8,613
Prior	12,299
Revolving	220
Revolving converted to term loans	0
Total loans and leases	43,218
30-59 days past due | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	8,241
Revolving converted to term loans	3,736
Total loans and leases	11,977
30-59 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	2,175
2019	1,873
2018	1,257
2017	842
2016	544
Prior	134
Revolving	0
Revolving converted to term loans	0
Total loans and leases	6,825
30-59 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	322
2019	114
2018	77
2017	18
2016	11
Prior	7
Revolving	3,061
Revolving converted to term loans	0
Total loans and leases	3,610
30-59 days past due | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	999
2019	925
2018	801
2017	718
2016	1,341
Prior	12,637
Revolving	156
Revolving converted to term loans	745
Total loans and leases	18,322
60-89 days past due | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	9
2016	0
Prior	68
Revolving	0
Revolving converted to term loans	0
Total loans and leases	77
60-89 days past due | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	30
2019	100
2018	1,246
2017	1,449
2016	834
Prior	4,705
Revolving	0
Revolving converted to term loans	0
Total loans and leases	8,364
60-89 days past due | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	527
Revolving converted to term loans	2,099
Total loans and leases	2,626
60-89 days past due | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	329
2019	689
2018	312
2017	351
2016	109
Prior	45
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,835
60-89 days past due | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	102
2019	20
2018	13
2017	18
2016	3
Prior	23
Revolving	1,285
Revolving converted to term loans	0
Total loans and leases	1,464
60-89 days past due | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	447
2019	81
2018	312
2017	695
2016	97
Prior	4,098
Revolving	9
Revolving converted to term loans	337
Total loans and leases	6,076
90 days or greater | Consumer Portfolio Segment | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	330
Revolving	0
Revolving converted to term loans	0
Total loans and leases	330
90 days or greater | Consumer Portfolio Segment | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	282
2019	4,831
2018	3,150
2017	4,015
2016	5,689
Prior	13,723
Revolving	0
Revolving converted to term loans	0
Total loans and leases	31,690
90 days or greater | Consumer Portfolio Segment | Revolving Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving	2,301
Revolving converted to term loans	5,114
Total loans and leases	7,415
90 days or greater | Consumer Portfolio Segment | Consumer Auto Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	170
2019	527
2018	217
2017	57
2016	102
Prior	3
Revolving	0
Revolving converted to term loans	0
Total loans and leases	1,076
90 days or greater | Consumer Portfolio Segment | Consumer Loan, Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	53
2019	84
2018	8
2017	0
2016	0
Prior	0
Revolving	1,360
Revolving converted to term loans	0
Total loans and leases	1,505
90 days or greater | PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020	721
2019	2,325
2018	4,755
2017	1,208
2016	897
Prior	19,963
Revolving	111
Revolving converted to term loans	1,046
Total loans and leases	$ 31,026

Loans and Leases (Composition_2

Loans and Leases (Composition of the Loans and Leases Outstanding by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	$ 32,791,975	$ 28,881,496
Past Due	245,485	272,770
Current	32,546,490	28,608,726
30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	121,499	136,220
60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	26,043	51,058
90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	97,943	85,492
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	22,558,060	18,836,331
Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		18,306,067
Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		211,156
Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		246,867
Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		3,660
Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		68,581
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	9,771,033	10,045,165
Current		9,879,384
Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		80,790
Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		31,329
Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		53,662
Construction and land development | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	985,424
Construction and land development | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	970,865
Construction and land development | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	12,162
Construction and land development | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	2,397
Construction and land development | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	348,123
Construction and land development | Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	932
Construction and land development | Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	77
Construction and land development | Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	330
Commercial and industrial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,013,644
Commercial and industrial | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	4,846,634
Commercial and industrial | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	50,429
Commercial and industrial | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	60,249
Commercial and industrial | Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	56,332
Non-PCI Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		18,552,002
Past Due		74,146
Current		18,477,856
Non-PCI Loans | Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		42,716
Non-PCI Loans | Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		14,553
Non-PCI Loans | Commercial | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		16,877
Non-PCI Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	9,771,033	9,770,778
Past Due	122,944	132,389
Current	9,648,089	9,638,389
Non-PCI Loans | Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	66,562	67,026
Non-PCI Loans | Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,366	25,721
Non-PCI Loans | Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	42,016	39,642
Non-PCI Loans | Construction and land development | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	985,424	1,013,454
Past Due	3,086	6,043
Current	982,338	1,007,411
Non-PCI Loans | Construction and land development | Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	956	3,146
Non-PCI Loans | Construction and land development | Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	527	195
Non-PCI Loans | Construction and land development | Commercial | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,603	2,702
Non-PCI Loans | Construction and land development | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		1,004,922
Non-PCI Loans | Construction and land development | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		2,577
Non-PCI Loans | Construction and land development | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		5,955
Non-PCI Loans | Construction and land development | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Construction and land development | Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	348,123	357,385
Past Due	1,339	2,992
Current	346,784	354,393
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	932	977
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	77	218
Non-PCI Loans | Construction and land development | Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	330	1,797
Non-PCI Loans | Mortgage | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		12,282,635
Past Due		37,482
Current		12,245,153
Non-PCI Loans | Mortgage | Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		20,389
Non-PCI Loans | Mortgage | Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		8,774
Non-PCI Loans | Mortgage | Commercial | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		8,319
Non-PCI Loans | Mortgage | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		12,050,799
Non-PCI Loans | Mortgage | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		115,164
Non-PCI Loans | Mortgage | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		116,672
Non-PCI Loans | Mortgage | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Mortgage | Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Mortgage | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		5,293,917
Current		5,205,380
Non-PCI Loans | Mortgage | Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		45,839
Non-PCI Loans | Mortgage | Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		18,289
Non-PCI Loans | Mortgage | Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		24,409
Non-PCI Loans | Other commercial real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		542,028
Past Due		1,890
Current		540,138
Non-PCI Loans | Other commercial real estate | Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		861
Non-PCI Loans | Other commercial real estate | Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		331
Non-PCI Loans | Other commercial real estate | Commercial | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		698
Non-PCI Loans | Other commercial real estate | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		536,682
Non-PCI Loans | Other commercial real estate | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		3,899
Non-PCI Loans | Other commercial real estate | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		1,447
Non-PCI Loans | Other commercial real estate | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Other commercial real estate | Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Commercial and industrial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	5,013,644	4,403,792
Past Due	20,617	28,143
Current	4,993,027	4,375,649
Non-PCI Loans | Commercial and industrial | Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,532	18,269
Non-PCI Loans | Commercial and industrial | Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,842	4,842
Non-PCI Loans | Commercial and industrial | Commercial | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,243	5,032
Non-PCI Loans | Commercial and industrial | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		4,256,456
Non-PCI Loans | Commercial and industrial | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		44,604
Non-PCI Loans | Commercial and industrial | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		34,148
Non-PCI Loans | Commercial and industrial | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		3
Non-PCI Loans | Commercial and industrial | Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		68,581
Non-PCI Loans | Other | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	22,558,060	310,093
Past Due	67,117	588
Current	22,490,943	309,505
Non-PCI Loans | Other | Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	36,615	51
Non-PCI Loans | Other | Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,601	411
Non-PCI Loans | Other | Commercial | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	24,901	126
Non-PCI Loans | Other | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		308,796
Non-PCI Loans | Other | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		622
Non-PCI Loans | Other | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		675
Non-PCI Loans | Other | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Other | Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		2,339,072
Current		2,316,010
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		9,729
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3,468
Non-PCI Loans | Revolving mortgage | Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		9,865
Non-PCI Loans | Consumer | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		1,780,404
Past Due		17,798
Current		1,762,606
Non-PCI Loans | Consumer | Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		10,481
Non-PCI Loans | Consumer | Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3,746
Non-PCI Loans | Consumer | Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		3,571
PCD Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	462,882	558,716
Past Due	55,424	66,235
Current	407,458	492,481
PCD Loans | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	18,322
Past Due	18,322	26,478
PCD Loans | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	6,076
Past Due	6,076	10,784
PCD Loans | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases	31,026
Past Due	$ 31,026	28,973
PCD Loans | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		284,329
PCD Loans | Commercial | Pass
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		148,412
PCD Loans | Commercial | Special mention
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		44,290
PCD Loans | Commercial | Substandard
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		87,970
PCD Loans | Commercial | Doubtful
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		3,657
PCD Loans | Commercial | Ungraded
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		0
PCD Loans | Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans and leases		274,387
Current		240,995
PCD Loans | Consumer Portfolio Segment | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		13,764
PCD Loans | Consumer Portfolio Segment | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		5,608
PCD Loans | Consumer Portfolio Segment | 90 days or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		$ 14,020

Loans and Leases (Purchased Loa

Loans and Leases (Purchased Loans and Leases) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Business Acquisition [Line Items]
Initial PCD allowance	$ 1,193
Discount	1,055
Construction and land development | Commercial
Business Acquisition [Line Items]
Initial PCD allowance	0
Construction and land development | Consumer Portfolio Segment
Business Acquisition [Line Items]
Initial PCD allowance	0
Mortgage Receivable, Owner Occupied | Commercial
Business Acquisition [Line Items]
Initial PCD allowance	0
Mortgage Receivable, Non-Owner Occupied | Commercial
Business Acquisition [Line Items]
Initial PCD allowance	0
Commercial and industrial | Commercial
Business Acquisition [Line Items]
Initial PCD allowance	0
Revolving Mortgage | Consumer Portfolio Segment
Business Acquisition [Line Items]
Initial PCD allowance	0
Consumer Auto Loan | Consumer Portfolio Segment
Business Acquisition [Line Items]
Initial PCD allowance	0
Consumer Loan, Other | Consumer Portfolio Segment
Business Acquisition [Line Items]
Initial PCD allowance	0
Residential Mortgage | Consumer Portfolio Segment
Business Acquisition [Line Items]
Initial PCD allowance	0
Community Financial Holding Co. Inc.
Business Acquisition [Line Items]
Contractually required payments	25,635
Initial PCD allowance	1,193
Fair value at acquisition date	23,387
Financing Receivable, Purchase	110,602
Community Financial Holding Co. Inc. | Commercial
Business Acquisition [Line Items]
Financing Receivable, Purchase	81,109
Community Financial Holding Co. Inc. | Consumer Portfolio Segment
Business Acquisition [Line Items]
Financing Receivable, Purchase	29,493
Community Financial Holding Co. Inc. | Construction and land development | Commercial
Business Acquisition [Line Items]
Financing Receivable, Purchase	9,428
Community Financial Holding Co. Inc. | Construction and land development | Consumer Portfolio Segment
Business Acquisition [Line Items]
Financing Receivable, Purchase	5,254
Community Financial Holding Co. Inc. | Mortgage Receivable, Owner Occupied | Commercial
Business Acquisition [Line Items]
Financing Receivable, Purchase	31,473
Community Financial Holding Co. Inc. | Mortgage Receivable, Non-Owner Occupied | Commercial
Business Acquisition [Line Items]
Financing Receivable, Purchase	25,143
Community Financial Holding Co. Inc. | Commercial and industrial | Commercial
Business Acquisition [Line Items]
Financing Receivable, Purchase	15,065
Community Financial Holding Co. Inc. | Revolving Mortgage | Consumer Portfolio Segment
Business Acquisition [Line Items]
Financing Receivable, Purchase	2,084
Community Financial Holding Co. Inc. | Consumer Auto Loan | Consumer Portfolio Segment
Business Acquisition [Line Items]
Financing Receivable, Purchase	294
Community Financial Holding Co. Inc. | Consumer Loan, Other | Consumer Portfolio Segment
Business Acquisition [Line Items]
Financing Receivable, Purchase	693
Community Financial Holding Co. Inc. | Residential Mortgage | Consumer Portfolio Segment
Business Acquisition [Line Items]
Financing Receivable, Purchase	$ 21,168

Allowance for Credit Losses (Su

Allowance for Credit Losses (Summary of Allowance for Credit Losses) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Jan. 01, 2020
Receivables [Abstract]
Financing receivable, allowance for credit loss, expected, COVID-19				$ 0
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 225,141,000	$ 223,712,000	$ 221,893,000
Provisions	58,352,000		28,467,000
Initial PCD allowance	1,193,000
Charge-offs	(45,105,000)		(39,671,000)
Recoveries	22,657,000		13,023,000
Ending balance	224,314,000	225,141,000	223,712,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	224,314,000	223,712,000	223,712,000	224,314,000
Financing Receivable, Allowance For Credit Loss, Decrease, COVID-19	$ 36,100,000
Allowance for credit loss, forecast period	2 years
Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 217,605,000
Ending balance		217,605,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	217,605,000	217,605,000
PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,536,000	9,144,000	10,026,000
Provisions	(7,202,000)	(1,608,000)	(765,000)
Initial PCD allowance	1,193,000
Charge-offs	(3,300,000)	0	(117,000)
Recoveries	6,759,000	0	0
Ending balance	23,987,000	7,536,000	9,144,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	7,536,000	7,536,000	9,144,000	23,987,000
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	(37,924,000)
Ending balance		(37,924,000)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	(37,924,000)	(37,924,000)			$ (37,900,000)
Cumulative Effect, Period of Adoption, Adjustment | Financial Asset Acquired and No Credit Deterioration
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss					(56,900,000)
Cumulative Effect, Period of Adoption, Adjustment | PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,001,000
Ending balance		19,001,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	19,001,000	19,001,000			$ 19,000,000
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	187,217,000
Ending balance		187,217,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	187,217,000	187,217,000
Cumulative Effect, Period of Adoption, Adjusted Balance | PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	26,537,000
Ending balance		26,537,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	26,537,000	26,537,000
Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	33,213,000	35,270,000	24,470,000
Provisions	4,301,000		10,533,000
Initial PCD allowance	0
Charge-offs	(138,000)		(44,000)
Recoveries	431,000		311,000
Ending balance	6,746,000	33,213,000	35,270,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	6,746,000	35,270,000	35,270,000	6,746,000
Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	33,213,000
Ending balance		33,213,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	33,213,000	33,213,000
Commercial | Construction and land development | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	(31,061,000)
Ending balance		(31,061,000)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	(31,061,000)	(31,061,000)
Commercial | Construction and land development | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,152,000
Ending balance		2,152,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	2,152,000	2,152,000
Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		43,451,000	45,005,000
Provisions			(1,490,000)
Charge-offs			(1,140,000)
Recoveries			1,076,000
Ending balance			43,451,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss		43,451,000	43,451,000
Commercial | Mortgage | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	45,335,000
Ending balance		45,335,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	45,335,000	45,335,000
Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		2,481,000	4,571,000
Provisions			(2,171,000)
Charge-offs			(69,000)
Recoveries			150,000
Ending balance			2,481,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss		2,481,000	2,481,000
Commercial | Other commercial real estate | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,211,000
Ending balance		2,211,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	2,211,000	2,211,000
Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	61,610,000	55,620,000	59,824,000
Provisions	13,816,000		2,511,000
Initial PCD allowance	0
Charge-offs	(14,904,000)		(10,211,000)
Recoveries	4,894,000		3,496,000
Ending balance	27,779,000	61,610,000	55,620,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	27,779,000	55,620,000	55,620,000	27,779,000
Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	59,374,000
Ending balance		59,374,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	59,374,000	59,374,000
Commercial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	(37,637,000)
Ending balance		(37,637,000)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	(37,637,000)	(37,637,000)
Commercial | Commercial and industrial | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	23,973,000
Ending balance		23,973,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	23,973,000	23,973,000
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		2,221,000	4,689,000
Provisions			(2,827,000)
Charge-offs			(130,000)
Recoveries			489,000
Ending balance			2,221,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss		2,221,000	2,221,000
Commercial | Other | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,236,000
Ending balance		2,236,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	2,236,000	2,236,000
Commercial | Mortgage Receivable, Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	36,444,000
Provisions	6,729,000
Initial PCD allowance	0
Charge-offs	(593,000)
Recoveries	401,000
Ending balance	23,665,000	36,444,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	23,665,000	36,444,000		23,665,000
Commercial | Mortgage Receivable, Owner Occupied | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	(19,316,000)
Ending balance		(19,316,000)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	(19,316,000)	(19,316,000)
Commercial | Mortgage Receivable, Owner Occupied | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	17,128,000
Ending balance		17,128,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	17,128,000	17,128,000
Commercial | Mortgage Receivable, Non-Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,102,000
Provisions	12,917,000
Initial PCD allowance	0
Charge-offs	(1,951,000)
Recoveries	124,000
Ending balance	22,652,000	11,102,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	22,652,000	11,102,000		22,652,000
Commercial | Mortgage Receivable, Non-Owner Occupied | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	460,000
Ending balance		460,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	460,000	460,000
Commercial | Mortgage Receivable, Non-Owner Occupied | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,562,000
Ending balance		11,562,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	11,562,000	11,562,000
Consumer Portfolio Segment | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,709,000	2,350,000	3,962,000
Provisions	266,000		(1,520,000)
Initial PCD allowance	0
Charge-offs	(70,000)		(219,000)
Recoveries	117,000		127,000
Ending balance	1,731,000	2,709,000	2,350,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	1,731,000	2,350,000	2,350,000	1,731,000
Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,709,000
Ending balance		2,709,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	2,709,000	2,709,000
Consumer Portfolio Segment | Construction and land development | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	(1,291,000)
Ending balance		(1,291,000)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	(1,291,000)	(1,291,000)
Consumer Portfolio Segment | Construction and land development | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,418,000
Ending balance		1,418,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	1,418,000	1,418,000
Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	18,232,000
Ending balance		18,232,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	18,232,000	18,232,000
Consumer Portfolio Segment | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		35,841,000	31,204,000
Provisions			22,187,000
Charge-offs			(22,817,000)
Recoveries			5,267,000
Ending balance			35,841,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss		35,841,000	35,841,000
Consumer Portfolio Segment | Consumer | Financial Asset Acquired and No Credit Deterioration
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	34,593,000
Ending balance		34,593,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	34,593,000	34,593,000
Consumer Portfolio Segment | Residential Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	18,232,000	15,472,000	15,706,000
Provisions	9,684,000		897,000
Initial PCD allowance	0
Charge-offs	(1,653,000)		(1,689,000)
Recoveries	717,000		558,000
Ending balance	44,098,000	18,232,000	15,472,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	44,098,000	15,472,000	15,472,000	44,098,000
Consumer Portfolio Segment | Residential Mortgage | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	17,118,000
Ending balance		17,118,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	17,118,000	17,118,000
Consumer Portfolio Segment | Residential Mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	35,350,000
Ending balance		35,350,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	35,350,000	35,350,000
Consumer Portfolio Segment | Revolving Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,702,000	21,862,000	22,436,000
Provisions	1,134,000		1,112,000
Initial PCD allowance	0
Charge-offs	(1,662,000)		(3,235,000)
Recoveries	1,918,000		1,549,000
Ending balance	24,757,000	19,702,000	21,862,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	24,757,000	21,862,000	$ 21,862,000	24,757,000
Consumer Portfolio Segment | Revolving Mortgage | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,665,000
Ending balance		3,665,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	3,665,000	3,665,000
Consumer Portfolio Segment | Revolving Mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	23,367,000
Ending balance		23,367,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	23,367,000	23,367,000
Consumer Portfolio Segment | Consumer Auto Loan
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,292,000
Provisions	6,297,000
Initial PCD allowance	0
Charge-offs	(3,646,000)
Recoveries	1,417,000
Ending balance	9,460,000	4,292,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	9,460,000	4,292,000		9,460,000
Consumer Portfolio Segment | Consumer Auto Loan | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,100,000
Ending balance		1,100,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	1,100,000	1,100,000
Consumer Portfolio Segment | Consumer Auto Loan | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,392,000
Ending balance		5,392,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	5,392,000	5,392,000
Consumer Portfolio Segment | Consumer Loan, Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	30,301,000
Provisions	10,410,000
Initial PCD allowance	0
Charge-offs	(17,188,000)
Recoveries	5,879,000
Ending balance	39,439,000	30,301,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	39,439,000	30,301,000		39,439,000
Consumer Portfolio Segment | Consumer Loan, Other | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,037,000
Ending balance		10,037,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	10,037,000	10,037,000
Consumer Portfolio Segment | Consumer Loan, Other | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	40,338,000
Ending balance		40,338,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	40,338,000	40,338,000
Unfunded Loan Commitment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,055,000
Provisions	2,874,000
Ending balance	12,814,000	1,055,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	12,814,000	1,055,000		$ 12,814,000
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,885,000
Ending balance		8,885,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	8,885,000	8,885,000
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,940,000
Ending balance		9,940,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	9,940,000	9,940,000
Non-PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	225,141,000
Provisions		31,441,000
Charge-offs		(43,027,000)
Recoveries		13,015,000
Ending balance		225,141,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	225,141,000	225,141,000
Non-PCI Loans | Commercial | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	33,213,000
Provisions		(2,171,000)
Charge-offs		(196,000)
Recoveries		310,000
Ending balance		33,213,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	33,213,000	33,213,000
Non-PCI Loans | Commercial | Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	45,335,000
Provisions		2,384,000
Charge-offs		(1,096,000)
Recoveries		596,000
Ending balance		45,335,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	45,335,000	45,335,000
Non-PCI Loans | Commercial | Other commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,211,000
Provisions		(285,000)
Charge-offs		0
Recoveries		15,000
Ending balance		2,211,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	2,211,000	2,211,000
Non-PCI Loans | Commercial | Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	59,374,000
Provisions		14,212,000
Charge-offs		(13,352,000)
Recoveries		2,894,000
Ending balance		59,374,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	59,374,000	59,374,000
Non-PCI Loans | Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,236,000
Provisions		(754,000)
Charge-offs		(100,000)
Recoveries		869,000
Ending balance		2,236,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	2,236,000	2,236,000
Non-PCI Loans | Consumer Portfolio Segment | Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,709,000
Provisions		359,000
Charge-offs		0
Recoveries		0
Ending balance		2,709,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	2,709,000	2,709,000
Non-PCI Loans | Consumer Portfolio Segment | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	34,593,000
Provisions		16,611,000
Charge-offs		(24,562,000)
Recoveries		6,703,000
Ending balance		34,593,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	34,593,000	34,593,000
Non-PCI Loans | Consumer Portfolio Segment | Residential Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	18,232,000
Provisions		3,481,000
Charge-offs		(1,137,000)
Recoveries		416,000
Ending balance		18,232,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	18,232,000	18,232,000
Non-PCI Loans | Consumer Portfolio Segment | Revolving Mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,702,000
Provisions		(788,000)
Charge-offs		(2,584,000)
Recoveries		1,212,000
Ending balance		19,702,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	19,702,000	19,702,000
PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,536,000
Ending balance		7,536,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	$ 7,536,000	$ 7,536,000

Allowance for Credit Losses (Co

Allowance for Credit Losses (Collateral Dependent Loans) (Details)	Dec. 31, 2020USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, collateral dependent, threshold for loans individually evaluated for impairment	$ 500,000
Financing Receivable, Collateral Dependent	58,825,000
Financing Receivable, Collateral, Net Realizable Value	$ 81,272,000
Financing Receivable, Collateral Coverage, Percentage	138.20%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 131,000
Financing Receivable, Collateral Dependent, Nonaccrual, No Allowance	57,500,000
Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Collateral Dependent	39,783,000
Financing Receivable, Collateral, Net Realizable Value	$ 53,400,000
Financing Receivable, Collateral Coverage, Percentage	134.20%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 131,000
Financial Asset Acquired and No Credit Deterioration | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Collateral Dependent	16,772,000
Financing Receivable, Collateral, Net Realizable Value	$ 23,625,000
Financing Receivable, Collateral Coverage, Percentage	140.90%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 0
PCD Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Collateral Dependent	19,042,000
Financing Receivable, Collateral, Net Realizable Value	$ 27,872,000
Financing Receivable, Collateral Coverage, Percentage	146.40%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 0
Construction and land development | Financial Asset Acquired and No Credit Deterioration | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Collateral Dependent	1,424,000
Financing Receivable, Collateral, Net Realizable Value	$ 1,795,000
Financing Receivable, Collateral Coverage, Percentage	126.10%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 0
Mortgage Receivable, Owner Occupied | Financial Asset Acquired and No Credit Deterioration | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Collateral Dependent	9,792,000
Financing Receivable, Collateral, Net Realizable Value	$ 14,253,000
Financing Receivable, Collateral Coverage, Percentage	145.60%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 0
Mortgage Receivable, Non-Owner Occupied | Financial Asset Acquired and No Credit Deterioration | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Collateral Dependent	5,556,000
Financing Receivable, Collateral, Net Realizable Value	$ 7,577,000
Financing Receivable, Collateral Coverage, Percentage	136.40%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 0
Residential Mortgage | Financial Asset Acquired and No Credit Deterioration | Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Collateral Dependent	23,011,000
Financing Receivable, Collateral, Net Realizable Value	$ 29,775,000
Financing Receivable, Collateral Coverage, Percentage	129.40%
Financing Receivable, Collateral Dependent, Allowance For Credit Loss	$ 131,000

Allowance for Credit Losses (Al

Allowance for Credit Losses (Allocation of Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	$ 224,314	$ 225,141	$ 223,712	$ 221,893
Net loans and leases	32,567,661	28,656,355
PCI Loans	462,882	558,716
Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		12,915
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		204,690
Allowance for loan and lease losses		217,605
Financing Receivable, Individually Evaluated for Impairment		185,599
Financing Receivable, Collectively Evaluated for Impairment		28,137,181
Net loans and leases		28,322,780
Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			2,481	4,571
Commercial | Other commercial real estate | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		39
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		2,172
Allowance for loan and lease losses		2,211
Financing Receivable, Individually Evaluated for Impairment		1,268
Financing Receivable, Collectively Evaluated for Impairment		540,760
Net loans and leases		542,028
Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	6,746	33,213	35,270	24,470
Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		463
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		32,750
Allowance for loan and lease losses		33,213
Financing Receivable, Individually Evaluated for Impairment		4,655
Financing Receivable, Collectively Evaluated for Impairment		1,008,799
Net loans and leases		1,013,454
Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			43,451	45,005
Commercial | Mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		3,650
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		41,685
Allowance for loan and lease losses		45,335
Financing Receivable, Individually Evaluated for Impairment		70,149
Financing Receivable, Collectively Evaluated for Impairment		12,212,486
Net loans and leases		12,282,635
Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	27,779	61,610	55,620	59,824
Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		1,379
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		57,995
Allowance for loan and lease losses		59,374
Financing Receivable, Individually Evaluated for Impairment		12,182
Financing Receivable, Collectively Evaluated for Impairment		4,391,610
Net loans and leases		4,403,792
Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			2,221	4,689
Commercial | Other | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		103
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		2,133
Allowance for loan and lease losses		2,236
Financing Receivable, Individually Evaluated for Impairment		639
Financing Receivable, Collectively Evaluated for Impairment		309,454
Net loans and leases		310,093
Noncommercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		3,882
Noncommercial | Mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		60,442
Noncommercial | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		28,869
Noncommercial | Consumer | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment		3,513
Consumer Portfolio Segment | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	$ 1,731	2,709	2,350	3,962
Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		174
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		2,535
Allowance for loan and lease losses		2,709
Financing Receivable, Collectively Evaluated for Impairment		353,503
Net loans and leases		357,385
Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		3,278
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		14,954
Allowance for loan and lease losses		18,232
Financing Receivable, Collectively Evaluated for Impairment		5,233,475
Net loans and leases		5,293,917
Consumer Portfolio Segment | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		2,722
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		16,980
Allowance for loan and lease losses		19,702
Financing Receivable, Collectively Evaluated for Impairment		2,310,203
Net loans and leases		2,339,072
Consumer Portfolio Segment | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses			$ 35,841	$ 31,204
Consumer Portfolio Segment | Consumer | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
ALLL for loans and leases individually evaluated for impairment		1,107
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		33,486
Allowance for loan and lease losses		34,593
Financing Receivable, Collectively Evaluated for Impairment		1,776,891
Net loans and leases		1,780,404
PCD Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses		7,536
Acquired loans which have adverse change in expected cash flows		$ 139,400

Allowance for Credit Losses (No

Allowance for Credit Losses (Non-PCI Impaired Loans and Leases) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Non-PCI Impaired Loans Collective Maximum Balance Collectively Evaluated for Impairment	$ 500,000
Impaired Financing Receivable Collectively Evaluated	41,000,000
Non-PCI Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	133,358,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	52,241,000
Financing Receivable, Individually Evaluated for Impairment	185,599,000
Outstanding principal balance	200,599,000
ALLL for loans and leases individually evaluated for impairment	12,915,000
Impaired Financing Receivable, Average Recorded Investment	169,938,000	$ 153,123,000
Impaired Financing Receivable, Interest Income, Accrual Method	5,410,000	5,488,000
Non-PCI Loans | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	52,516,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	36,377,000
Financing Receivable, Individually Evaluated for Impairment	88,893,000
Outstanding principal balance	95,927,000
ALLL for loans and leases individually evaluated for impairment	5,634,000
Impaired Financing Receivable, Average Recorded Investment	81,477,000	78,597,000
Impaired Financing Receivable, Interest Income, Accrual Method	2,761,000	3,063,000
Non-PCI Loans | Noncommercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	80,842,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	15,864,000
Financing Receivable, Individually Evaluated for Impairment	96,706,000
Outstanding principal balance	104,672,000
ALLL for loans and leases individually evaluated for impairment	7,281,000
Impaired Financing Receivable, Average Recorded Investment	88,461,000	74,526,000
Impaired Financing Receivable, Interest Income, Accrual Method	2,649,000	2,425,000
Non-PCI Loans | Construction and land development | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,851,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,804,000
Financing Receivable, Individually Evaluated for Impairment	4,655,000
Outstanding principal balance	5,109,000
ALLL for loans and leases individually evaluated for impairment	463,000
Impaired Financing Receivable, Average Recorded Investment	3,915,000	1,734,000
Impaired Financing Receivable, Interest Income, Accrual Method	53,000	84,000
Non-PCI Loans | Construction and land development | Noncommercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,470,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,412,000
Financing Receivable, Individually Evaluated for Impairment	3,882,000
Outstanding principal balance	4,150,000
ALLL for loans and leases individually evaluated for impairment	174,000
Impaired Financing Receivable, Average Recorded Investment	3,589,000	3,677,000
Impaired Financing Receivable, Interest Income, Accrual Method	116,000	172,000
Non-PCI Loans | Mortgage | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	42,394,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	27,755,000
Financing Receivable, Individually Evaluated for Impairment	70,149,000
Outstanding principal balance	74,804,000
ALLL for loans and leases individually evaluated for impairment	3,650,000
Impaired Financing Receivable, Average Recorded Investment	64,363,000	65,943,000
Impaired Financing Receivable, Interest Income, Accrual Method	2,188,000	2,569,000
Non-PCI Loans | Mortgage | Noncommercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	48,796,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11,646,000
Financing Receivable, Individually Evaluated for Impairment	60,442,000
Outstanding principal balance	64,741,000
ALLL for loans and leases individually evaluated for impairment	3,278,000
Impaired Financing Receivable, Average Recorded Investment	52,045,000	41,368,000
Impaired Financing Receivable, Interest Income, Accrual Method	1,386,000	1,237,000
Non-PCI Loans | Other commercial real estate | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	318,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	950,000
Financing Receivable, Individually Evaluated for Impairment	1,268,000
Outstanding principal balance	1,360,000
ALLL for loans and leases individually evaluated for impairment	39,000
Impaired Financing Receivable, Average Recorded Investment	919,000	1,225,000
Impaired Financing Receivable, Interest Income, Accrual Method	27,000	43,000
Non-PCI Loans | Commercial and industrial | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,547,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,635,000
Financing Receivable, Individually Evaluated for Impairment	12,182,000
Outstanding principal balance	13,993,000
ALLL for loans and leases individually evaluated for impairment	1,379,000
Impaired Financing Receivable, Average Recorded Investment	11,884,000	9,560,000
Impaired Financing Receivable, Interest Income, Accrual Method	482,000	364,000
Non-PCI Loans | Other | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	406,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	233,000
Financing Receivable, Individually Evaluated for Impairment	639,000
Outstanding principal balance	661,000
ALLL for loans and leases individually evaluated for impairment	103,000
Impaired Financing Receivable, Average Recorded Investment	396,000	135,000
Impaired Financing Receivable, Interest Income, Accrual Method	11,000	3,000
Non-PCI Loans | Revolving mortgage | Noncommercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	26,104,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,765,000
Financing Receivable, Individually Evaluated for Impairment	28,869,000
Outstanding principal balance	31,960,000
ALLL for loans and leases individually evaluated for impairment	2,722,000
Impaired Financing Receivable, Average Recorded Investment	29,516,000	26,759,000
Impaired Financing Receivable, Interest Income, Accrual Method	1,009,000	900,000
Non-PCI Loans | Consumer | Noncommercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,472,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	41,000
Financing Receivable, Individually Evaluated for Impairment	3,513,000
Outstanding principal balance	3,821,000
ALLL for loans and leases individually evaluated for impairment	1,107,000
Impaired Financing Receivable, Average Recorded Investment	3,311,000	2,722,000
Impaired Financing Receivable, Interest Income, Accrual Method	$ 138,000	$ 116,000

Allowance for Credit Losses (Tr

Allowance for Credit Losses (Troubled Debt Restructuring) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Accruing	$ 208,180		$ 171,192	$ 156,130
Nonaccruing	191,483	$ 168,717
Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing			154,000	137,900
PCD Loans
Financing Receivable, Modifications [Line Items]
Accruing	24,963		17,200	18,200
Commercial
Financing Receivable, Modifications [Line Items]
Accruing			77,536	74,560
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing			2,766	2,298
Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	632
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing			61,935	61,065
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Accruing			571	860
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Accruing			11,839	10,046
Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	32,659
Commercial | Other
Financing Receivable, Modifications [Line Items]
Accruing			425	291
Commercial | Other | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	101,739
Commercial | Mortgage Receivable, Owner Occupied | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	48,463
Commercial | Mortgage Receivable, Non-Owner Occupied | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	19,985
Consumer Portfolio Segment
Financing Receivable, Modifications [Line Items]
Accruing			93,656	81,570
Consumer Portfolio Segment | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	81,478
Consumer Portfolio Segment | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing			3,882	2,337
Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	1,582
Consumer Portfolio Segment | Consumer Auto Loan | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	2,714
Consumer Portfolio Segment | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing			57,861	47,524
Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	48,838
Consumer Portfolio Segment | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Accruing			28,399	28,688
Consumer Portfolio Segment | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	27,252
Consumer Portfolio Segment | Consumer and Other
Financing Receivable, Modifications [Line Items]
Accruing			3,514	3,021
Consumer Portfolio Segment | Consumer and Other | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	1,092
Accruing
Financing Receivable, Modifications [Line Items]
Accruing	157,364		128,750	127,093
Accruing | PCD Loans
Financing Receivable, Modifications [Line Items]
Accruing	17,617
Accruing | Commercial
Financing Receivable, Modifications [Line Items]
Accruing			61,627	64,171
Accruing | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing			487	1,946
Accruing | Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	578
Accruing | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing			50,819	53,270
Accruing | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Accruing			571	851
Accruing | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Accruing			9,430	7,986
Accruing | Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	29,131
Accruing | Commercial | Other
Financing Receivable, Modifications [Line Items]
Accruing			320	118
Accruing | Commercial | Other | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	85,619
Accruing | Commercial | Mortgage Receivable, Owner Occupied | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	37,574
Accruing | Commercial | Mortgage Receivable, Non-Owner Occupied | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	18,336
Accruing | Consumer Portfolio Segment
Financing Receivable, Modifications [Line Items]
Accruing			67,123	62,922
Accruing | Consumer Portfolio Segment | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	54,128
Accruing | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Modifications [Line Items]
Accruing			1,452	2,227
Accruing | Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	1,573
Accruing | Consumer Portfolio Segment | Consumer Auto Loan | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	2,018
Accruing | Consumer Portfolio Segment | Mortgage
Financing Receivable, Modifications [Line Items]
Accruing			41,813	37,903
Accruing | Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	29,458
Accruing | Consumer Portfolio Segment | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Accruing			21,032	20,492
Accruing | Consumer Portfolio Segment | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	20,124
Accruing | Consumer Portfolio Segment | Consumer and Other
Financing Receivable, Modifications [Line Items]
Accruing			2,826	2,300
Accruing | Consumer Portfolio Segment | Consumer and Other | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	955
Nonaccruing
Financing Receivable, Modifications [Line Items]
Accruing	50,816
Nonaccruing			42,442	29,037
Nonaccruing | PCD Loans
Financing Receivable, Modifications [Line Items]
Accruing	7,346
Nonaccruing | Commercial
Financing Receivable, Modifications [Line Items]
Nonaccruing			15,909	10,389
Nonaccruing | Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Nonaccruing			2,279	352
Nonaccruing | Commercial | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	54
Nonaccruing | Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing			11,116	7,795
Nonaccruing | Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Nonaccruing			0	9
Nonaccruing | Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Nonaccruing			2,409	2,060
Nonaccruing | Commercial | Commercial and industrial | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	3,528
Nonaccruing | Commercial | Other
Financing Receivable, Modifications [Line Items]
Nonaccruing			105	173
Nonaccruing | Commercial | Other | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	16,120
Nonaccruing | Commercial | Mortgage Receivable, Owner Occupied | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	10,889
Nonaccruing | Commercial | Mortgage Receivable, Non-Owner Occupied | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	1,649
Nonaccruing | Consumer Portfolio Segment
Financing Receivable, Modifications [Line Items]
Nonaccruing			26,533	18,648
Nonaccruing | Consumer Portfolio Segment | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Accruing	27,350
Nonaccruing | Consumer Portfolio Segment | Construction and land development
Financing Receivable, Modifications [Line Items]
Nonaccruing			2,430	110
Nonaccruing | Consumer Portfolio Segment | Construction and land development | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	9
Nonaccruing | Consumer Portfolio Segment | Consumer Auto Loan | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	696
Nonaccruing | Consumer Portfolio Segment | Mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing			16,048	9,621
Nonaccruing | Consumer Portfolio Segment | Mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	19,380
Nonaccruing | Consumer Portfolio Segment | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Nonaccruing			7,367	8,196
Nonaccruing | Consumer Portfolio Segment | Revolving mortgage | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	7,128
Nonaccruing | Consumer Portfolio Segment | Consumer and Other
Financing Receivable, Modifications [Line Items]
Nonaccruing			$ 688	$ 721
Nonaccruing | Consumer Portfolio Segment | Consumer and Other | Financial Asset Acquired and No Credit Deterioration
Financing Receivable, Modifications [Line Items]
Nonaccruing	$ 137

Allowance for Credit Losses (_2

Allowance for Credit Losses (Note Restructurings During Period) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loans	Dec. 31, 2019USD ($)loans	Dec. 31, 2018USD ($)loans
Non-PCD Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	599
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 92,688
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	226
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 20,802
Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		505	491
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 52,169	$ 43,554
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		190	164
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 19,709	$ 13,318
Principal Forgiveness [Member] | Non-PCD Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	37
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 32,314
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	9
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 7,067
Principal Forgiveness [Member] | Non-PCD Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	31
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 28,145
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 4,498
Principal Forgiveness [Member] | Non-PCD Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	6
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 4,169
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 2,569
Principal Forgiveness [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		18	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 5,613	$ 1,003
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		3	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 2,955	$ 0
Principal Forgiveness [Member] | Non-PCI Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		11	3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 1,595	$ 1,003
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 238	$ 0
Principal Forgiveness [Member] | Non-PCI Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		7	0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 4,018	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 2,717	$ 0
Extended Maturity [Member] | Non-PCD Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	92
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 11,133
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	48
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 4,712
Extended Maturity [Member] | Non-PCD Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	26
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 5,444
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,471
Extended Maturity [Member] | Non-PCD Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	66
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 5,689
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	43
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 3,241
Extended Maturity [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		18	42
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 4,246	$ 5,487
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		6	8
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 839	$ 865
Extended Maturity [Member] | Non-PCI Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		16	21
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 3,904	$ 3,933
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		5	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 533	$ 675
Extended Maturity [Member] | Non-PCI Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		2	21
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 342	$ 1,554
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		1	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 306	$ 190
Interest Rate Below Market Reduction [Member] | Non-PCD Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	254
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 39,944
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	86
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 5,809
Interest Rate Below Market Reduction [Member] | Non-PCD Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	98
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 33,870
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	26
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 1,912
Interest Rate Below Market Reduction [Member] | Non-PCD Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	156
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 6,074
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	60
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 3,897
Interest Rate Below Market Reduction [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		266	269
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 26,390	$ 28,404
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		90	92
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 6,648	$ 8,459
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		90	85
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 13,932	$ 12,859
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		24	24
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 2,634	$ 2,998
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		176	184
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 12,458	$ 15,545
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		66	68
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 4,014	$ 5,461
Discharge of Debt [Member] | Non-PCD Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	216
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 9,297
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	83
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 3,214
Discharge of Debt [Member] | Non-PCD Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	30
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 1,168
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	17
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 286
Discharge of Debt [Member] | Non-PCD Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans	186
Financing Receivable, Modifications, Post-Modification Recorded Investment | $	$ 8,129
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans	66
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $	$ 2,928
Discharge of Debt [Member] | Non-PCI Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		203	177
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 15,920	$ 8,660
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		91	64
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 9,267	$ 3,994
Discharge of Debt [Member] | Non-PCI Loans | Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		25	26
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 5,571	$ 2,043
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		20	8
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 5,028	$ 825
Discharge of Debt [Member] | Non-PCI Loans | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loans		178	151
Financing Receivable, Modifications, Post-Modification Recorded Investment | $		$ 10,349	$ 6,617
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans		71	56
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $		$ 4,239	$ 3,169

Premises and Equipment (Major C

Premises and Equipment (Major Classifications) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,261,459	$ 2,159,367
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,010,176	914,971
Property, Plant and Equipment, Net	1,251,283	1,244,396
Depreciation	108,641	103,828	$ 96,781
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	336,258	335,093
Premises and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,286,092	1,228,588
Furniture, equipment and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 639,109	$ 595,686

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Real Estate Properties [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 29,400	$ 23,000
Gains (Losses) on Sales of Foreclosed Other Real Estate	1,600	1,500
Other Real Estate [Roll Forward]
Beginning balance	46,591	48,030
Other Real Estate, Additions	26,822	21,684
Sales	(26,726)	(24,432)
Write-downs/losses	(5,610)	(4,150)
Ending balance	50,890	46,591
2019 Acquisitions
Other Real Estate [Roll Forward]
Other Real Estate, Additions	9,813	5,459
Mortgage
Other Real Estate [Roll Forward]
Beginning balance	14,500
Ending balance	$ 5,800	$ 14,500

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)$ / loansRate	Dec. 31, 2019USD ($)$ / loansRate	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Goodwill [Roll Forward]
Beginning goodwill	$ 349,398	$ 236,347
Ending goodwill	350,298	349,398	$ 236,347
Servicing Asset at Amortized Cost	18,426	22,963	21,396	$ 21,945
Servicing Asset at Amortized Cost, Additions	8,006	6,149	5,258
Amortization	(8,400)	(6,233)	(5,807)
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries)	4,143	222	0
Residential Mortgage Loans Serviced	$ 3,310,000	$ 3,380,000	2,950,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | Rate	20.62%	13.72%
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	$ 8,500	$ 7,900	7,500
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans	87.58	87.09
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 43,386	$ 48,232
Amortization	(14,255)	(16,346)
Ending balance	29,667	43,386	48,232
Finite-Lived Intangible Assets [Abstract]
Gross balance	127,842	154,507
Accumulated amortization	(98,175)	(111,121)
Carrying value	29,667	43,386
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Asset, Expected Amortization, Year One		10,948
Finite-Lived Intangible Asset, Expected Amortization, Year Two		7,743
Finite-Lived Intangible Asset, Expected Amortization, Year Three		5,129
Finite-Lived Intangible Asset, Expected Amortization, Year Four		2,658
Finite-Lived Intangible Asset, Expected Amortization, Year Five		3,189
Community Financial Holding Co. Inc.
Goodwill [Roll Forward]
Goodwill acquired	686
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired	536
Biscayne Bancshares
Goodwill [Roll Forward]
Goodwill acquired		46,521
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired		4,745
First South Bancorp
Goodwill [Roll Forward]
Goodwill acquired		13,896
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired		2,268
Entegra Financial
Goodwill [Roll Forward]
Goodwill acquired	0	52,634
Business combination, measurement period adjustment, amount	214
Ending goodwill	52,600
Servicing Asset at Amortized Cost, Additions	$ 0	1,873	$ 0
Finite-lived Intangible Assets [Roll Forward]
Intangible assets acquired		$ 4,487
Conventional fixed loans
Goodwill [Roll Forward]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | Rate	7.92%	8.92%
All loans and leases excluding conventional fixed loans [Member]
Goodwill [Roll Forward]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | Rate	8.92%	9.92%
Core Deposit Intangibles
Goodwill [Roll Forward]
Useful life (years)	9 years

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Valuation Allowance for Impairment of Recognized Servicing Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Beginning balance	$ 222	$ 0	$ 0
Valuation allowance increase	4,143	222	0
Ending balance	$ 4,365	$ 222	$ 0

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
FDIC Deposit Insurance Limit		$ 250
Time Deposits Greater than $250,000, Carrying Value	$ 670,400	891,200
Deposits, by Type [Abstract]
Demand	18,014,029	12,926,796
Checking with interest	10,591,687	8,284,302
Money market accounts	8,632,713	6,817,752
Savings	3,304,167	2,564,777
Time	2,889,013	3,837,609
Total deposits	43,431,609	$ 34,431,236
Maturities of Time Deposits [Abstract]
2021	1,844,860
2022	648,516
2023	143,272
2024	67,908
2024	42,960
Thereafter	$ 141,497

Borrowings (Short-Term) (Detail

Borrowings (Short-Term) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Short-term borrowings	$ 641,487	$ 738,233
Additional secured debt available	11,310,000
Securities sold under customer repurchase agreements
Short-term Debt [Line Items]
Short-term borrowings	641,487	442,956
Notes payable to FHLB of Atlanta
Short-term Debt [Line Items]
Short-term borrowings	0	255,000
Other short-term debt
Short-term Debt [Line Items]
Short-term borrowings	0	$ 40,277
Unsecured Debt
Short-term Debt [Line Items]
Accessible overnight borrowings	$ 598,000

Borrowings (Repurchase Agreemen

Borrowings (Repurchase Agreements) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	$ 689,300
Securities Sold under Agreements to Repurchase	641,487	$ 442,956
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	641,500
Available-for-sale Securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral		477,600
Government Agency Securities | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	432,800
Commercial Mortgage Backed Securities | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase	$ 208,700
U. S. Treasury | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Securities Sold under Agreements to Repurchase		$ 443,000

Borrowings (Long-Term Obligatio

Borrowings (Long-Term Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt Issuance Costs, Net	$ (3,459)	$ 0
Long-term Debt, Fiscal Year Maturity [Abstract]
2021	10,000
2022	98,709
2023	125,500
2024	6,144
2025	7,500
Thereafter	1,000,310
Total long-term obligations	1,248,163	588,638
Trust Preferred Securities	128,500
Subordinated Debt [Member] | Fixed-to-Floating subordinated notes at 3.375% maturing March 15, 2030
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 350,000	0
Debt interest rate	3.375%
Junior Subordinated Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 132,500
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 1.75% maturing June 30, 2036
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 88,145	88,145
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 1.75% maturing June 30, 2036 | Libor 3 Month Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Long-term Debt, Fiscal Year Maturity [Abstract]
Description of variable rate basis	3-month LIBOR
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.25% maturing June 15, 2034
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 19,588	19,588
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.25% maturing June 15, 2034 | Libor 3 Month Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Long-term Debt, Fiscal Year Maturity [Abstract]
Description of variable rate basis	3-month LIBOR
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.85% maturing April 7, 2034
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 10,310	10,310
Junior Subordinated Debt [Member] | Junior subordinated debenture at 3-month LIBOR plus 2.85% maturing April 7, 2034 | Libor 3 Month Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.85%
Long-term Debt, Fiscal Year Maturity [Abstract]
Description of variable rate basis	3-month LIBOR
Junior Subordinated Debt [Member] | Junior subordinated debentures at 3-month LIBOR plus 2.80% maturing March 30, 2034
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 14,433	14,433
Junior Subordinated Debt [Member] | Junior subordinated debentures at 3-month LIBOR plus 2.80% maturing March 30, 2034 | Libor 3 Month Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.80%
Long-term Debt, Fiscal Year Maturity [Abstract]
Description of variable rate basis	3-month LIBOR
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.00% maturing December 31, 2026(1)
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 20,000	20,000
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.00% maturing December 31, 2026(1) | Libor 3 Month Rate [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt interest rate	7.00%
Junior Subordinated Debt [Member] | Junior subordinated debentures at 6.50% maturing October 1, 2025(2)
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 7,500	7,500
Junior Subordinated Debt [Member] | Junior subordinated debentures at 6.50% maturing October 1, 2025(2) | Libor 3 Month Rate [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt interest rate	6.50%
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.13% called February 25, 2020(2)
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 0	5,000
Junior Subordinated Debt [Member] | Junior subordinated debentures at 7.13% called February 25, 2020(2) | Libor 3 Month Rate [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt interest rate	7.13%
Notes payable to FHLB of Atlanta | Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 655,175	317,191
Notes payable to FHLB of Atlanta | Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032 | Minimum
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt interest rate	0.75%
Notes payable to FHLB of Atlanta | Notes payable to FHLBs of Atlanta and Chicago with rates ranging from 0.75% to 2.99% and maturing through March 2032 | Maximum
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt interest rate	2.99%
Unsecured Term Loan [Member] | Unsecured term loan at 1-month LIBOR plus 1.10% maturing September 5, 2022
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 82,125	96,425
Unsecured Term Loan [Member] | Unsecured term loan at 1-month LIBOR plus 1.10% maturing September 5, 2022 | Libor 1 Month Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.10%
Long-term Debt, Fiscal Year Maturity [Abstract]
Description of variable rate basis	1-month LIBOR
Capital Lease Obligations [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 6,308	8,230
Unamortized Purchase Accounting Adjustments [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	(1,999)	(1,569)
Other Long Term Debt [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term obligations	$ 37	$ 3,385

FDIC Shared-Loss Payable (Chang

FDIC Shared-Loss Payable (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
FDIC Indemnification Asset [Roll Forward]
Beginning balance	$ 112,395	$ 112,395	$ 105,618
Accretion		2,674	6,777
Payment made to the FDIC to settle shared-loss agreement	$ 99,500	(99,468)	0
Ending balance		$ 15,601	$ 112,395

FDIC Shared-Loss Payable - Narr

FDIC Shared-Loss Payable - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered		$ 34,500
Payment made to the FDIC to settle shared-loss agreement	$ 99,500	(99,468)	$ 0
FDIC shared-loss payable		$ 15,601	$ 112,395		$ 105,618
Scenario, Forecast
Accounts, Notes, Loans and Financing Receivable [Line Items]
FDIC shared-loss payable				$ 15,900

Shareholders' Equity, Dividen_3

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Details) $ / shares in Units, $ in Thousands	Mar. 12, 2020shares	Dec. 31, 2020USD ($)vote$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital required for common equity Tier 1 capital to risk-weighted assets		4.50%
Dividends from subsidiaries		$ 229,685
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets		0.0600
Capital Required for Capital Adequacy to Risk Weighted Assets		0.0800
Leverage Capital Required Ratio To Tangible Assets		0.0400
Stock repurchases during period		$ 333,800	$ 450,800
Price of repurchased shares (usd per share) | $ / shares		$ 410.48	$ 451.33
Outstanding Shares Repurchased, Percent			8.40%	9.40%
Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status		$ 1,700,000
Average Required Maintence Of Non Interst Bearing Reserve Balance		$ 115,200
Capital Conservation Buffer		2.50%
Net proceeds from preferred stock issuance		$ 339,937	$ 0	$ 0
Non-Cumulative Perpetual Preferred Stock, Series A [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preferred Stock, dividend rate, percentage		5.375%
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01
Preferred Stock, Liquidation Preference Per Share | $ / shares		1,000
Fixed-to-Floating Rate Subordinated Notes Due 2030 [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preferred Stock, Liquidation Preference Per Share | $ / shares		$ 25
Qualifying Subordinated Debentures [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 2 capital		$ 377,500	32,500
Common Class A [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock | vote		1
Stock repurchases during period		$ 333,755	$ 450,880	165,338
Stock Repurchased and Retired During Period, Shares | shares		813,090	998,910
Class B Common Stock
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock | vote		16
Depositary Shares [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock Issued During Period, Shares, New Issues | shares	13,800,000
Net proceeds from preferred stock issuance		$ 345,000
Trusted Preferred Capital Securities [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 2 capital		128,500	$ 128,500
Parent
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends from subsidiaries			149,819	242,900
Net proceeds from preferred stock issuance		339,937	0	$ 0
BancShares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy		4,577,212	3,731,501
Capital Required for Capital Adequacy		3,516,149	3,344,305
Leverage Capital Required for Capital Adequacy		$ 3,856,086	$ 3,344,305
Tier 1 Risk Based Capital to Risk Weighted Assets		0.1381	0.1212
Capital to Risk Weighted Assets		0.1061	0.1086
Leverage Capital to Average Assets		0.0786	0.0881
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		0.1000
Common equity Tier 1		$ 3,856,086	$ 3,344,305
Common equity Tier 1 to risk-weighted assets		0.1163	0.1086
Common equity Tier 1 required to be well capitalized to risk-weighted assets		8.00%
Capital Required to be Well Capitalized		0.0650
Leverage Capital Required to be Well Capitalized to Average Assets		0.0500
Capital Conservation Buffer			5.63%
FCB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy		$ 4,543,496	$ 3,837,670
Capital Required for Capital Adequacy		4,276,870	3,554,974
Leverage Capital Required for Capital Adequacy		$ 4,276,870	$ 3,554,974
Tier 1 Risk Based Capital to Risk Weighted Assets		0.1372	0.1246
Capital to Risk Weighted Assets		0.1292	0.1154
Leverage Capital to Average Assets		0.0872	0.0938
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		0.1000
Common equity Tier 1		$ 4,276,870	$ 3,554,974
Common equity Tier 1 to risk-weighted assets		0.1292	0.1154
Common equity Tier 1 required to be well capitalized to risk-weighted assets		8.00%
Capital Required to be Well Capitalized		0.0650
Leverage Capital Required to be Well Capitalized to Average Assets		0.0500
Capital Conservation Buffer			5.72%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), before Tax		$ 15,926	$ (164,576)
Deferred tax expense (benefit)		3,663	(37,853)
Accumulated other comprehensive income (loss), net of tax		12,263	(126,723)
Income taxes	$ (13,900)	(126,159)	(134,677)	$ (103,297)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		27,276	(18,292)
Unrealized gains on securities available for sale
Accumulated Other Comprehensive Income (Loss), before Tax		102,278	7,522
Deferred tax expense (benefit)		23,524	1,730
Accumulated other comprehensive income (loss), net of tax		78,754	5,792
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		46,395	5,479
Defined benefit pension items
Accumulated Other Comprehensive Income (Loss), before Tax		(91,751)	(172,098)
Deferred tax expense (benefit)		(21,103)	(39,583)
Accumulated other comprehensive income (loss), net of tax		(70,648)	(132,515)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(19,500)	(8,456)
Reclassification adjustment for losses included in income before income taxes			(10,924)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax		(25,324)	(10,981)
Unrealized gains on securities available for sale transferred from (to) held to maturity
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Before Tax		495	(19,889)
Accumulated Other Comprehensive Income (Loss), before Tax		5,399	0
Deferred tax expense (benefit)		1,242	0
Accumulated other comprehensive income (loss), net of tax		4,157	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		381	(15,315)
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Tax		(114)	4,574
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Net Of Tax		$ 381	$ (15,315)

Accumulated Other Comrehensive

Accumulated Other Comrehensive Loss (Components of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss	$ (27,276)	$ 18,292
Net current period other comprehensive income	138,986	108,464	$ (62,842)
Unrealized gains on securities available for sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity	5,792	(38,505)
Net unrealized gains (losses) arising during period	119,357	49,776
Amounts reclassified from accumulated other comprehensive loss	(46,395)	(5,479)
Net current period other comprehensive income	72,962	44,297
Stockholders' equity	78,754	5,792	(38,505)
Unrealized gains on securities available for sale transferred from (to) held to maturity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity	0	(71,149)
Net unrealized gains (losses) arising during period	4,538	55,834
Amounts reclassified from accumulated other comprehensive loss	(381)	15,315
Net current period other comprehensive income	4,157	71,149
Stockholders' equity	4,157	0	(71,149)
Defined Benefit Pension Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity	(132,515)	(125,533)
Net unrealized gains (losses) arising during period	42,367	(15,438)
Amounts reclassified from accumulated other comprehensive loss	19,500	8,456
Net current period other comprehensive income	61,867	(6,982)
Stockholders' equity	(70,648)	(132,515)	(125,533)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity	(126,723)	(235,187)
Net unrealized gains (losses) arising during period	166,262	90,172
Amounts reclassified from accumulated other comprehensive loss	(27,276)	18,292
Net current period other comprehensive income	138,986	108,464	(62,842)
Stockholders' equity	$ 12,263	$ (126,723)	$ (235,187)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	$ 60,253	$ 7,115	$ 351
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(13,858)	(1,636)	$ (81)
Amounts reclassified from accumulated other comprehensive income, net of tax	(27,276)	18,292
Unrealized gains on securities available for sale
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	60,253	7,115
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(13,858)	(1,636)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	46,395	5,479
Amounts reclassified from accumulated other comprehensive income, net of tax	(46,395)	(5,479)
Unrealized gains on securities available for sale transferred from (to) held to maturity
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Before Tax	495	(19,889)
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Tax	(114)	4,574
Other Comprehensive Income (Loss) Reclassification Adjustment Of Unrealized Losses From AOCI For Securities Available For Sale Transferred To Held To Maturity Net Of Tax	381	(15,315)
Amounts reclassified from accumulated other comprehensive income, net of tax	(381)	15,315
Defined Benefit Pension Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax		(57)
Reclassification adjustment for losses included in income before income taxes		10,924
Total before taxes	25,324	10,981
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	5,824	2,525
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	19,500	8,456
Amounts reclassified from accumulated other comprehensive income, net of tax	$ 19,500	$ 8,456

Other Noninterest Income and _3

Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Operating Cost and Expense [Line Items]
Other Noninterest Income	$ 7,446	$ 18,431	$ 19,700
Other Noninterest Expense	145,117	139,283	147,063
PCD Loans
Other Operating Cost and Expense [Line Items]
Proceeds from Recoveries of Loans Previously Charged off		17,400	16,600
Telecommunication
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	14,255	16,346	17,165
Consultant
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	12,751	12,801	14,345
Core Deposit Intangible Amortization
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	10,010	11,437	11,650
Advertising
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	12,179	9,391	10,471
Other Expense
Other Operating Cost and Expense [Line Items]
Other Noninterest Expense	$ 95,922	$ 89,308	$ 93,432

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards		$ 41,700,000
Deferred tax assets, state net operating loss carryforward			$ 19,500,000
Tax Credit Carryforward, Valuation Allowance		0
Income Tax Examination, Penalties and Interest Expense		467,000	(135,000)	$ 114,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		896,000	429,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance of unrecognized tax benefits		32,226,000	28,255,000	29,004,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		153,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			(683,000)	(1,054,000)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions		1,295,000	6,554,000	1,433,000
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		(1,516,000)	0	0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		783,000	1,900,000	1,128,000
Ending balance of unrecognized tax benefits		31,375,000	32,226,000	28,255,000
Current tax expense
Federal		137,162,000	68,984,000	95,151,000
State		14,532,000	11,095,000	21,523,000
Total current tax expense		151,694,000	80,079,000	116,674,000
Deferred Income Tax Expense (Benefit)
Federal		(28,535,000)	50,522,000	(10,944,000)
State		3,000,000	4,076,000	(2,433,000)
Total deferred tax expense		(25,535,000)	54,598,000	(13,377,000)
Total income tax expense	$ 13,900,000	$ 126,159,000	134,677,000	103,297,000
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory rate		21.00%
Income taxes at federal statutory rates		$ 129,755,000	124,330,000	105,758,000
Nontaxable income on loans, leases and investments, net of nondeductible expenses		(1,581,000)	(1,639,000)	(1,796,000)
Excess tax benefits of compensation		1,146,000	1,070,000	371,000
State and local income taxes, including any change in valuation allowance, net of federal income tax benefit		13,850,000	11,985,000	15,081,000
Effect of federal rate change		0	0	(15,736,000)
Tax credits net of amortization		(5,367,000)	(4,474,000)	(2,891,000)
Repayment of claim of right income		(13,926,000)	0	0
Other, net		2,282,000	3,405,000	2,510,000
Total income tax expense	$ 13,900,000	126,159,000	134,677,000	$ 103,297,000
Deferred Tax Assets, Net [Abstract]
Allowance for loan and lease losses		52,293,000	53,073,000
Operating lease liabilities		15,737,000	17,752,000
Executive separation from service agreements		8,989,000	12,334,000
Federal net operating loss carryforward		9,545,000	11,085,000
Employee compensation		16,083,000	13,313,000
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences		0	8,678,000
Deferred Tax Assets, Other reserves		5,376,000	5,001,000
Other		6,898,000	10,698,000
Deferred tax asset		114,921,000	131,934,000
Deferred Tax Liabilities, accelerated depreciation		14,984,000	51,249,000
Lease financing activities		15,265,000	8,101,000
Operating lease assets		15,670,000	17,837,000
Net unrealized gain on securities included in accumulated other comprehensive loss		24,857,000	1,821,000
Net deferred loan fees and costs		13,975,000	11,781,000
Intangible assets		13,012,000	9,148,000
Deferred Tax Liability, Security, loan and debt valuations		2,051,000	5,767,000
FDIC-assisted transactions timing differences		2,393,000	0
Pension liability		44,549,000	5,079,000
Other		10,193,000	15,993,000
Deferred Tax Liabilities, Gross		156,949,000	126,776,000
Net deferred tax (liability) asset		$ 42,028,000
Net deferred tax (liability) asset			$ 5,158,000

Estimated Fair Values (Narrativ

Estimated Fair Values (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 3,900	$ 289	$ 50
Loans Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Of Items For Which Fair Value Option Was Elected Assets	$ 124,837	67,869
Loans Held For Sale | 90 days or greater
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Of Items For Which Fair Value Option Was Elected Assets		$ 0
Minimum | Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.06	6
Other Real Estate Owned, Measurement Input	0.07
Minimum | Effective Interest Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		3
Maximum | Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.10	11
Other Real Estate Owned, Measurement Input	0.16
Maximum | Effective Interest Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		7
Weighted Average [Member] | Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.0763
Other Real Estate Owned, Measurement Input	0.0844
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability measured at fair value on nonrecurring basis		$ 0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability measured at fair value on nonrecurring basis		0
Corporate Bond Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		$ (112,600)

Estimated Fair Values (Estimate

Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 362,048	$ 376,719
Overnight investments	4,347,336	1,107,844
Investment securities available for sale	7,014,243	7,059,674
Investment securities held to maturity	2,816,982	30,996
Investment in marketable equity securities	91,680	82,333
Loans held for sale	124,800	67,900
Net loans and leases	32,567,661	28,656,355
Income earned not collected	145,694	123,154
Deposits	43,431,609	34,431,236
Time Deposits	2,889,013	3,837,609
Securities Sold under Agreements to Repurchase	641,487	442,956
Subordinated Debt	504,518	163,412
Other Borrowings	88,470	148,318
FDIC shared-loss payable	15,601	112,395	$ 105,618
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	362,048	376,719
Overnight investments	4,347,336	1,107,844
Investment securities available for sale	7,014,243	7,059,674
Investment securities held to maturity	2,816,982	30,996
Investment in marketable equity securities	91,680	82,333
Loans held for sale	124,837	67,869
Net loans and leases	32,567,661	28,656,355
Income earned not collected	145,694	123,154
Federal Home Loan Bank stock	45,392	43,039
Mortgage servicing assets	19,628	24,891
Deposits	40,542,596	30,593,627
Time Deposits	2,889,013	3,837,609
Securities Sold under Agreements to Repurchase	641,487	442,956
Federal Home Loan Bank Advances	655,175	572,185
Subordinated Debt	504,518	163,412
Other Borrowings	88,470	148,318
FDIC shared-loss payable	15,601	112,395
Accrued interest payable	9,414	18,124
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	362,048	376,719
Overnight investments	4,347,336	1,107,844
Investment securities available for sale	7,014,243	7,059,674
Investment securities held to maturity	2,838,499	30,996
Investment in marketable equity securities	91,680	82,333
Loans held for sale	124,837	67,869
Net loans and leases	33,298,166	28,878,550
Income earned not collected	145,694	123,154
Federal Home Loan Bank stock	45,392	43,039
Mortgage servicing assets	20,283	26,927
Deposits	40,542,596	30,593,627
Time Deposits	2,905,577	3,842,162
Securities Sold under Agreements to Repurchase	641,487	442,956
Federal Home Loan Bank Advances	677,579	577,362
Subordinated Debt	525,610	173,685
Other Borrowings	89,263	149,232
FDIC shared-loss payable	15,843	114,252
Accrued interest payable	$ 9,414	$ 18,124

Estimated Fair Values (Assets A

Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 7,014,243	$ 7,059,674
Equity Securities, FV-NI	91,680	82,333
Loans held for sale	124,837	67,869
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	7,014,243	7,059,674
Loans held for sale	124,837	67,869
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Loans held for sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	6,697,619	6,989,989
Loans held for sale	124,837	67,869
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	316,624	69,685
Loans held for sale	0	0
Fair Value, Measurements, Recurring | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	499,933
Available-for-sale Securities		409,999
Fair Value, Measurements, Recurring | U.S. Treasury | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Available-for-sale Securities		0
Fair Value, Measurements, Recurring | U.S. Treasury | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	499,933
Available-for-sale Securities		409,999
Fair Value, Measurements, Recurring | U.S. Treasury | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Available-for-sale Securities		0
Fair Value, Measurements, Recurring | Government Agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	701,391
Available-for-sale Securities		682,772
Fair Value, Measurements, Recurring | Government Agency | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Available-for-sale Securities		0
Fair Value, Measurements, Recurring | Government Agency | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	701,391
Available-for-sale Securities		682,772
Fair Value, Measurements, Recurring | Government Agency | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Available-for-sale Securities		0
Fair Value, Measurements, Recurring | Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	4,438,103
Available-for-sale Securities		5,267,090
Fair Value, Measurements, Recurring | Mortgage Backed Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Available-for-sale Securities		0
Fair Value, Measurements, Recurring | Mortgage Backed Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	4,438,103
Available-for-sale Securities		5,267,090
Fair Value, Measurements, Recurring | Mortgage Backed Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Available-for-sale Securities		0
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	771,537	380,020
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	771,537	380,020
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		118,227
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		118,227
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale		0
Fair Value, Measurements, Recurring | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	91,680	82,333
Fair Value, Measurements, Recurring | Equity Securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	32,855	29,458
Fair Value, Measurements, Recurring | Equity Securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	58,825	52,875
Fair Value, Measurements, Recurring | Equity Securities | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0	0
Fair Value, Measurements, Recurring | Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	603,279
Available-for-sale Securities		201,566
Fair Value, Measurements, Recurring | Corporate Bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	0
Available-for-sale Securities		0
Fair Value, Measurements, Recurring | Corporate Bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	286,655
Available-for-sale Securities		131,881
Fair Value, Measurements, Recurring | Corporate Bonds | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 316,624
Available-for-sale Securities		$ 69,685

Estimated Fair Values (Assets_2

Estimated Fair Values (Assets and Liabilities Carried at Fair Value on a Recurring Basis Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 69,685	$ 143,226
Purchases	242,595	35,993
Unrealized net gains included in other comprehensive income	2,898	3,891
Amounts included in net income	(336)	174
Transfers in	1,782	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0	(112,599)
Sales / Calls	0	(1,000)
Ending balance	316,624	69,685
Investment securities available for sale	316,624	69,685
Corporate Bond Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers in	$ 1,800
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		$ (112,600)

Estimated Fair Values (Fair Val

Estimated Fair Values (Fair Value Option) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 3,900	$ 289	$ 50
Disposal Group, Including Discontinued Operation, Loans Receivable, Net	124,800	67,900
Loans Held For Sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Of Items For Which Fair Value Option Was Elected Assets	124,837	67,869
Aggregate Unpaid Principal Balance Of Items For Which Fair Value Option Was Elected Assets	118,902	65,697
Fair Value Option Aggregate Difference Assets	$ 5,935	$ 2,172

Estimated Fair Values (Assets_3

Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate	$ 50,890	$ 46,591	$ 48,030
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	11,779	132,336
Other Real Estate	40,115	38,310
Mortgage servicing assets	16,966	3,757
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	0	0
Other Real Estate	0	0
Mortgage servicing assets	0	0
Fair Value, Measurements, Nonrecurring | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	0	0
Other Real Estate	0	0
Mortgage servicing assets	0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans not covered by loss share agreements	11,779	132,336
Other Real Estate	40,115	38,310
Mortgage servicing assets	$ 16,966	$ 3,757

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2007
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 100,000	$ 3,592
Funded status	157,902	(14,334)
Accumulated benefit obligation	$ 985,000	904,500
Percent of employer match (percent)	100.00%			4.50%
Percentage of employee compensation matched	6.00%
Additional contribution if employed at end of year	3.00%
Defined contribution plan cost	$ 35,600	30,800	$ 28,600
Deferred compensation cash-based arrangements, liability, current and noncurrent	68,200	57,000
BancShares Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	80,000	71
Bancorporation Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 20,000	$ 3,500
401(k) Matching Range 1
Defined Benefit Plan Disclosure [Line Items]
Percent of employer match (percent)				100.00%
Percentage of employee compensation matched				3.00%
401(k) Matching Range 2
Defined Benefit Plan Disclosure [Line Items]
Percent of employer match (percent)				50.00%
Percentage of employee compensation matched				3.00%

Employee Benefit Plans (Funded

Employee Benefit Plans (Funded Status Of Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1	$ 990,406	$ 852,975
Service cost	14,279	12,767	$ 16,154
Interest cost	34,197	37,260	34,733
Actuarial (gain) loss	72,080	118,964
Benefits paid	(33,309)	(31,560)
Benefit obligation at December 31	1,077,653	990,406	852,975
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance	976,072	842,534
Actual return on plan assets	192,792	161,506
Employer contributions	100,000	3,592
Benefits paid	(33,309)	(31,560)
Fair value of plan assets, ending balance	1,235,555	976,072	$ 842,534
Funded status	157,902	(14,334)
BancShares Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	$ 80,000	$ 71

Employee Benefit Plans (Amounts

Employee Benefit Plans (Amounts Recognized in the Financial Statements) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amount recognized in accumulated other comprehensive income
Net loss (gain)	$ 91,751	$ 172,098

Employee Benefit Plans (Net Ben

Employee Benefit Plans (Net Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits, Description [Abstract]
Service cost	$ 14,279	$ 12,767	$ 16,154
Interest cost	34,197	37,260	34,733
Expected return on assets	(65,689)	(62,590)	(60,296)
Amortization of prior service cost	0	(57)	(79)
Amortization of net actuarial loss	25,324	10,924	13,902
Total pension expense	8,111	(1,582)	4,572
Current year actuarial gain (loss)	(55,023)	20,049	32,012
Total change from defined benefit plans, net of tax	(80,347)	9,068	18,031
Total recognized in net periodic benefit cost and other comprehensive income	$ (72,236)	$ 7,486	$ 22,603

Employee Benefit Plans (Assumpt

Employee Benefit Plans (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assumptions used to determine the benefit obligations
Discount rate	2.76%	3.46%
Rate of compensation increase	5.60%	5.60%
Assumptions used to determine net periodic benefit cost
Discount rate	3.46%	4.38%	3.76%
Rate of compensation increase	5.60%	5.60%	4.00%
Expected long-term rate of return on plan assets (percent)	7.50%	7.50%	7.50%

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Value and Allocation Of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 1,235,555	$ 976,072	$ 842,534
Actual % of Plan Assets	100.00%	100.00%
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 991,128	$ 775,527
Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	244,427	200,545
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 37,913	$ 10,974
Actual % of Plan Assets	3.00%	1.00%
Cash and equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Cash and equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%
Cash and equivalents | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 37,913	$ 10,974
Cash and equivalents | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Cash and equivalents | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 144,924	$ 142,157
Actual % of Plan Assets	77.00%	73.00%
Equity securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
Equity securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%
Equity securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 144,924	$ 142,157
Equity securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity mutual funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	559,472	565,343
Equity mutual funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	559,472	565,343
Equity mutual funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Equity mutual funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	$ 0
Exchange Traded Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	248,819
Exchange Traded Funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	248,819
Exchange Traded Funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0
Exchange Traded Funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Actual % of Plan Assets	20.00%	23.00%
Debt Securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	15.00%
Debt Securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	45.00%
US government and government agency securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 90,292	$ 78,175
US government and government agency securities | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
US government and government agency securities | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	90,292	78,175
US government and government agency securities | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	154,135	122,370
Corporate Bonds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Corporate Bonds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	154,135	122,370
Corporate Bonds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0	0
Fixed Income Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets		25,288
Fixed Income Mutual Funds | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets		25,288
Fixed Income Mutual Funds | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets		0
Fixed Income Mutual Funds | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets		0
Alternative investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets		$ 31,765
Actual % of Plan Assets		3.00%
Alternative investments | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	0.00%
Alternative investments | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
Alternative investments | Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets		$ 31,765
Alternative investments | Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs)
Defined Benefit Plan Disclosure [Line Items]
Plan assets		0
Alternative investments | Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets		$ 0

Employee Benefit Plans (Project

Employee Benefit Plans (Projected Benefit Payments) (Details) $ in Thousands	Dec. 31, 2020USD ($)
Retirement Benefits, Description [Abstract]
2020	$ 38,660
2021	41,340
2022	43,777
2023	46,161
2024	48,343
2025-2029	$ 269,256

Employee Benefit Plans (Present

Employee Benefit Plans (Present Value of Accrued Liability) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 01, 2019	Apr. 02, 2019
Present Value Of Accrued Liability [Roll Forward]
Discount rate adjustment	$ 1,719	$ 1,574
Benefit expense and interest cost	8,111	(1,582)	$ 4,572
Interest cost	$ 34,197	$ 37,260	34,733
Discount rate	2.76%	3.46%
Executives Directors And Officer Of Acquired Entities
Present Value Of Accrued Liability [Roll Forward]
Present value of accrued liability as of January 1	$ 45,295	$ 34,063
Benefit expense and interest cost	3,503	2,396
Benefits paid	7,862	4,681
Present value of accrued liability as of December 31	42,655	45,295	$ 34,063
Biscayne Bancshares
Present Value Of Accrued Liability [Roll Forward]
Liability assumed	0	1,138			$ 956,800
First South Bancorp
Present Value Of Accrued Liability [Roll Forward]
Liability assumed	0	1,067		$ 215,600
Entegra
Present Value Of Accrued Liability [Roll Forward]
Liability assumed	$ 0	$ 9,738

Leases (Operating and Finance L

Leases (Operating and Finance Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Asset, operating	$ 68,048	$ 77,115
Asset, finance	6,478	8,820
Total leased assets	$ 74,526	$ 85,935
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Present value of lease liabilities	$ 68,343	$ 76,746
Present value of lease liabilities	6,308	8,230
Total lease liabilities	$ 74,651	$ 84,976

Leases (Net Lease Cost) (Detail

Leases (Net Lease Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 15,023	$ 16,094
Amortization of leased assets	2,168	1,975
Interest on lease liabilities	220	259
Variable lease cost	3,231	2,394
Sublease income	(350)	(390)
Net lease cost	$ 20,292	$ 20,332

Leases (Lease Liability Maturit

Leases (Lease Liability Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2020	$ 12,865
2021	11,757
2022	9,980
2023	8,146
2024	5,223
Thereafter	32,045
Total lease payments	80,016
Less: Interest	11,673
Present value of lease liabilities	68,343	$ 76,746
Finance Leases
2020	2,159
2021	1,876
2022	993
2023	617
2024	635
Thereafter	431
Total lease payments	6,711
Less: Interest	403
Present value of lease liabilities	6,308	$ 8,230
Total
2020	15,024
2021	13,633
2022	10,973
2023	8,763
2024	5,858
Thereafter	32,476
Total lease payments	86,727
Less: Interest	12,076
Present value of lease liabilities	$ 74,651

Leases (Remaining Weighted Aver

Leases (Remaining Weighted Average Lease Terms and Discounts Rates) (Details)	Dec. 31, 2020
Leases [Abstract]
Weighted average remaining lease term, operating	9 years 2 months 12 days
Weighted average remaining lease term, finance	4 years
Weighted average discount rate, operating	3.14%
Weighted average discount rate, finance	3.08%

Leases (Supplemental Cash Flow

Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 14,237	$ 15,703
Operating cash flows from finance leases	220	259
Financing cash flows from finance leases	1,922	1,850
Right-of-use assets obtained in exchange for new operating lease liabilities	4,595	17,837
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 0	$ 1,886

Transactions with Related Per_3

Transactions with Related Persons (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 145,000	$ 199,000
New loans	19,000	5,000
Repayments	(47,000)	(59,000)
Ending balance	117,000	$ 145,000	$ 199,000
Unfunded loan commitments available to related parties	$ 2,600,000
Price of repurchased shares (usd per share)	$ 410.48	$ 451.33
Credit Card
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans receivable excluded from total amount, threshold	$ 15,000
Overdraw Line
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans receivable excluded from total amount, threshold	$ 5,000
Class A Common Stock
Loans and Leases Receivable, Related Parties [Roll Forward]
Share repurchased from related party (in shares)	813,090	998,910	382,000
Class A Common Stock | Related Party
Loans and Leases Receivable, Related Parties [Roll Forward]
Share repurchased from related party (in shares)	45,000	100,000

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Guarantor Obligations [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 163,900	$ 167,800
FDIC shared-loss payable	15,601	112,395	$ 105,618
Commitments to Extend Credit
Guarantor Obligations [Line Items]
Unused Commitments to Extend Credit	12,098,417	10,682,378
Amortization Method Qualified Affordable Housing Project Investments	53,700	70,000
Standby Letters of Credit
Guarantor Obligations [Line Items]
Affordable Housing Program Obligation	$ 129,819	$ 99,601

Parent Company Financial Stat_3

Parent Company Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Overnight investments		$ 4,347,336	$ 1,107,844
Investment in marketable equity securities		91,680	82,333
Investment securities available for sale		7,014,243	7,059,674
Other assets		783,953	610,891
Total assets		49,957,680	39,824,496
Liabilities and Shareholders' Equity
Short-term borrowings		641,487	738,233
Long-term obligations		1,248,163	588,638
Other liabilities		391,552	367,810
Stockholders' equity		4,229,268	3,586,184	$ 3,488,954	$ 3,334,064
Total liabilities and shareholders' equity		49,957,680	39,824,496
Income Statement [Abstract]
Interest expense		95,857	92,642	36,857
Net interest income		1,388,169	1,311,369	1,208,900
Dividends from subsidiaries		229,685
Income tax benefit	$ 13,900	126,159	134,677	103,297
Net income		491,723	457,371	400,313
Net income available to common shareholders		477,661	457,371	400,313
OPERATING ACTIVITIES
Net income		491,723	457,371	400,313
Net amortization of premiums and accretion of discounts		(8,513)	(27,263)	(32,291)
Marketable equity securities (gains) losses, net		(29,395)	(20,625)	7,610
Gain on elimination of acquired debt		0	0	(26,553)
Change in other assets		(7,286)	(24,274)	(5,076)
Change in other liabilities		(6,115)	(15,992)	9,105
Net cash provided by (Used in) Operating Activities		340,015	540,277	453,769
INVESTING ACTIVITIES
Net change in overnight investments		(3,204,363)	(65,181)	601,979
Purchases of marketable equity securities		(333,140)	(26,166)	(2,818)
Proceeds from sales of marketable equity securities		352,835	56,749	9,528
Investments in Majority-owned Subsidiaries		(422,500)	0	0
Net Cash Provided by (Used in) Investing Activities		(9,871,758)	(1,558,177)	101,140
FINANCING ACTIVITIES
Net change in short-term borrowings		(96,746)	(27,703)	(246,517)
Proceeds from Issuance of Long-term Debt		(400,000)	(200,000)	(125,000)
Repurchase of common stock		(333,755)	(453,123)	(163,095)
Cash dividends paid		(30,393)	(18,137)	(16,779)
Net cash used by financing activities		9,517,072	1,067,179	(563,619)
Cash payments for
Income taxes		116,583	83,038	73,806
Net proceeds from subordinated notes issuance		345,849	0	0
Net proceeds from preferred stock issuance		339,937	0	0
Parent
Assets
Cash		49,716	4,573
Overnight investments		1,607	2,547
Investment in marketable equity securities		91,680	82,333
Investment securities available for sale		2,010	3,015
Investment in Banking Subsidiaries		4,621,676	3,763,947
Investment in Other Subsidiaries		3,241	3,555
Due from subsidiaries		786	0
Other assets		48,591	45,164
Total assets		4,819,307	3,905,134
Liabilities and Shareholders' Equity
Short-term borrowings		452,350	105,677
Long-term obligations		128,125	201,702
Due to Affiliate		0	1,670
Other liabilities		9,564	9,901
Stockholders' equity		4,229,268	3,586,184
Total liabilities and shareholders' equity		4,819,307	3,905,134
Income Statement [Abstract]
Interest income		3,952	1,327	1,362
Interest expense		16,817	7,187	5,154
Net interest income		(12,865)	(5,860)	(3,792)
Dividends from subsidiaries			149,819	242,900
Dividend Income, Banking Subsidiaries				242,910
Marketable equity securities losses, net		29,395	20,625	(7,610)
Other income (loss)		574	257	347
Other operating expense		13,168	9,497	11,127
Income before income tax benefit and equity in undistributed net income of subsidiaries		233,621	155,344	220,728
Income tax benefit		879	892	(5,184)
Income before equity in undistributed net income of subsidiaries		232,742	154,452	225,912
Excess distributions (undistributed ) net income of subsidiaries		(258,981)	(302,919)	(174,401)
Net income		491,723	457,371	400,313
Less: Preferred stock dividends		14,062	0	0
Net income available to common shareholders		477,661	457,371	400,313
OPERATING ACTIVITIES
Net income		491,723	457,371	400,313
Excess distributions (undistributed ) net income of subsidiaries		(258,981)	(302,919)	(174,401)
Net amortization of premiums and accretion of discounts		824	119	88
Gain on elimination of acquired debt		0	0	(160)
Gain (Loss) on Disposition of Other Assets		2,456	2,185	381
Change in other assets		(3,074)	(2,001)	3,657
Securities (gains) losses		0	(20)	0
Change in other liabilities		(694)	981	(2,595)
Net cash provided by (Used in) Operating Activities		197,947	130,721	234,131
INVESTING ACTIVITIES
Net change in loans		0	100,000	(100,000)
Net change in overnight investments		940	2,162	14,091
Purchases of marketable equity securities		(333,140)	(26,166)	(2,818)
Proceeds from sales of marketable equity securities		352,835	56,749	9,528
Purchases of investment securities		0	0	(6,438)
Maturities and sales of investment securities		1,000	3,477	9,997
Net Cash Provided by (Used in) Investing Activities		(400,865)	136,222	(75,640)
FINANCING ACTIVITIES
Net change in short-term borrowings		(40,277)	40,277	(15,000)
Repayment of long-term obligations		(33,300)	(3,575)	(1,840)
Proceeds from Issuance of Long-term Debt		0	165,000	0
Repurchase of common stock		(333,755)	(453,123)	(163,095)
Cash dividends paid		(30,393)	(18,137)	(16,779)
Net cash used by financing activities		248,061	(269,558)	(196,714)
Net change in cash		45,143	(2,615)	(38,223)
Cash and due from banks at beginning of period		4,573	7,188	45,411
Cash and due from banks at end of period		49,716	4,573	7,188
Cash payments for
Interest		13,338	7,187	5,154
Income taxes		106,618	78,345	73,806
Net proceeds from subordinated notes issuance		345,849	0	0
Net proceeds from preferred stock issuance		$ 339,937	$ 0	$ 0