SouthState (SSB) 10-Q 2 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2019
Entity File Number	001-12669
Entity Registrant Name	SOUTH STATE CORP
Entity Incorporation, State or Country Code	SC
Entity Tax Identification Number	57-0799315
Entity Address, Address Line One	520 Gervais Street
Entity Address, City or Town	Columbia
Entity Address, State or Province	SC
Entity Address, Postal Zip Code	29201
City Area Code	800
Local Phone Number	277-2175
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
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	SSB
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		34,147,790
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000764038
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Cash and cash equivalents:
Cash and due from banks	$ 251,631	$ 251,411	$ 250,106
Interest-bearing deposits with banks	500,340	124,895	73,013
Federal funds sold and securities purchased under agreements to resell	100,000	32,677	73,730
Total cash and cash equivalents	851,971	408,983	396,849
Investment securities:
Securities held to maturity (fair value of $0, $0 and $503, respectively)			499
Securities available for sale, at fair value	1,717,276	1,517,067	1,577,999
Other investments	49,124	25,604	19,229
Total investment securities	1,766,400	1,542,671	1,597,727
Loans held for sale	47,796	22,925	36,968
Loans:
Loans, net	11,167,979	10,962,037	10,778,068
Other real estate owned	14,506	11,410	17,222
Premises and equipment, net	321,348	241,076	245,288
Bank owned life insurance	231,708	230,105	227,588
Deferred tax assets	28,240	37,128	48,853
Mortgage servicing rights	30,332	34,727	35,107
Core deposit and other intangibles	56,351	62,900	69,975
Goodwill	1,002,900	1,002,900	1,002,722
Other assets	163,806	119,466	110,121
Total assets	15,683,337	14,676,328	14,566,488
Deposits:
Noninterest-bearing	3,255,906	3,061,769	3,152,828
Interest-bearing	8,666,374	8,585,164	8,485,461
Total deposits	11,922,280	11,646,933	11,638,289
Federal funds purchased and securities sold under agreements to repurchase	298,029	270,649	331,969
Other borrowings	816,414	266,084	115,754
Other liabilities	272,636	126,366	132,109
Total liabilities	13,309,359	12,310,032	12,218,121
Shareholders' equity:
Common stock - $2.50 par value; authorized 80,000,000 shares; 34,735,587, 35,829,549 and 36,825,556 shares issued and outstanding, respectively	86,839	89,574	92,064
Surplus	1,676,229	1,750,495	1,811,446
Retained earnings	609,444	551,108	480,928
Accumulated other comprehensive income (loss)	1,466	(24,881)	(36,071)
Total shareholders' equity	2,373,978	2,366,296	2,348,367
Total liabilities and shareholders' equity	15,683,337	14,676,328	14,566,488
Acquired credit impaired loans
Loans:
Loans, net	419,961	485,119	551,979
Total loans	424,584	489,723	556,405
Acquired non-credit impaired loans
Loans:
Total loans	2,180,281	2,594,826	3,076,424
Non-acquired loans
Loans:
Total loans	8,621,327	7,933,286	7,197,539
Less allowance for non-acquired loan losses	(53,590)	(51,194)	(47,874)
Loans, net	$ 8,567,737	$ 7,882,092	$ 7,149,665

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Investment securities:
Securities held to maturity, fair value (in dollars)	$ 0	$ 0	$ 503
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50	$ 2.50
Common stock, shares authorized	80,000,000	80,000,000	80,000,000
Common stock, shares issued	34,735,587	35,829,549	36,825,556
Common stock, shares outstanding	34,735,587	35,829,549	36,825,556

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Loans, including fees	$ 135,388	$ 129,852	$ 267,222	$ 256,893
Investment securities:
Taxable	9,551	9,048	18,148	17,836
Tax-exempt	1,617	1,614	3,113	3,173
Federal funds sold and securities purchased under agreements to resell	3,426	1,218	4,889	1,878
Total interest income	149,982	141,732	293,372	279,780
Interest expense:
Deposits	17,393	10,009	34,038	16,922
Federal funds purchased and securities sold under agreements to repurchase	673	642	1,426	1,096
Other borrowings	4,737	1,519	7,462	3,227
Total interest expense	22,803	12,170	42,926	21,245
Net interest income	127,179	129,562	250,446	258,535
Provision for loan losses	3,704	4,478	5,192	6,932
Net interest income after provision for loan losses	123,475	125,084	245,254	251,603
Noninterest income:
Securities gains (losses), net	1,709	(641)	2,250	(641)
Recoveries on acquired loans	1,347	2,167	3,214	5,142
Other	2,794	2,503	4,982	5,078
Total noninterest income	37,618	37,525	69,676	78,080
Noninterest expense:
Salaries and employee benefits	58,547	55,026	116,978	117,491
Net occupancy expense	7,616	7,815	14,815	15,981
Information services expense	8,671	8,903	17,680	18,641
Furniture and equipment expense	4,233	4,519	8,646	9,145
OREO expense and loan related	881	1,037	1,632	2,698
Pension plan termination expense	9,526		9,526
Amortization of intangibles	3,268	3,722	6,549	7,135
Supplies, printing and postage expense	1,495	1,406	2,999	2,798
Professional fees	2,781	1,898	5,021	3,597
FDIC assessment and other regulatory charges	1,455	3,277	2,990	4,540
Advertising and marketing	959	1,163	1,766	1,899
Merger and branch consolidation related expense	2,078	14,096	3,058	25,392
Other	7,897	7,644	15,986	14,652
Total noninterest expense	109,407	110,506	207,646	223,969
Earnings:
Income before provision for income taxes	51,686	52,103	107,284	105,714
Provision for income taxes	10,226	11,644	21,457	22,929
Net income	$ 41,460	$ 40,459	$ 85,827	$ 82,785
Earnings per common share:
Basic (in dollars per share)	$ 1.18	$ 1.10	$ 2.43	$ 2.25
Diluted (in dollars per share)	$ 1.17	$ 1.09	$ 2.42	$ 2.24
Weighted average common shares outstanding:
Basic (in shares)	35,089	36,677	35,268	36,657
Diluted (in shares)	35,300	36,929	35,461	36,910
Fees on deposit accounts
Noninterest income:
Noninterest income	$ 18,741	$ 22,612	$ 36,549	$ 45,155
Mortgage banking income
Noninterest income:
Noninterest income	5,307	3,317	7,692	8,265
Trust and investment services income
Noninterest income:
Noninterest income	$ 7,720	$ 7,567	$ 14,989	$ 15,081

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 41,460	$ 40,459	$ 85,827	$ 82,785
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	24,593	(8,216)	42,426	(30,298)
Tax effect	(5,410)	1,807	(9,334)	6,697
Reclassification adjustment for gains included in net income	(1,709)	641	(2,250)	641
Tax effect	376	(141)	496	(141)
Net of tax amount	17,850	(5,909)	31,338	(23,101)
Unrealized gains (losses) on derivative financial instruments qualifying as cash flow hedges:
Unrealized holding gains (losses) arising during period	(11,275)	8	(13,943)	44
Tax effect	2,480	(2)	3,067	(10)
Reclassification adjustment for gains (losses) included in interest expense	(350)	39	(343)	87
Tax effect	77	(8)	75	(19)
Net of tax amount	(9,068)	37	(11,144)	102
Change in pension plan obligation:
Reclassification adjustment for changes included in net income	7,767	194	7,888	387
Tax effect	(1,709)	(43)	(1,735)	(85)
Net of tax amount	6,058	151	6,153	302
Other comprehensive income (loss), net of tax	14,840	(5,721)	26,347	(22,697)
Comprehensive income	$ 56,300	$ 34,738	$ 112,174	$ 60,088

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2017	$ 91,899	$ 1,807,601	$ 419,847	$ (10,427)	$ 2,308,920
Balance (in shares) at Dec. 31, 2017	36,759,656
Increase (Decrease) in Stockholders' Equity
Comprehensive income			82,785	(22,697)	60,088
Cash dividends declared on common stock per share			(24,651)		(24,651)
AOCI reclassification to retained earnings from adoption of ASU 2018-02			2,947	(2,947)
Employee stock purchases	$ 11	341			352
Employee stock purchases (in shares)	4,338
Stock options exercised	$ 83	948			1,031
Stock options exercised (in shares)	33,424
Restricted stock awards	$ 20	(20)
Restricted stock awards (in shares)	7,836
Stock issued pursuant to restricted stock units.	$ 99	(99)
Stock issued pursuant to restricted stock units (in shares)	39,541
Common stock repurchased	$ (48)	(1,678)			(1,726)
Common stock repurchased (in shares)	(19,239)
Share-based compensation expense		4,353			4,353
Balance at Jun. 30, 2018	$ 92,064	1,811,446	480,928	(36,071)	$ 2,348,367
Balance (in shares) at Jun. 30, 2018	36,825,556				36,825,556
Balance at Dec. 31, 2018	$ 89,574	1,750,495	551,108	(24,881)	$ 2,366,296
Balance (in shares) at Dec. 31, 2018	35,829,549				35,829,549
Increase (Decrease) in Stockholders' Equity
Comprehensive income			85,827	26,347	$ 112,174
Cash dividends declared on common stock per share			(27,491)		(27,491)
Employee stock purchases	$ 15	328			343
Employee stock purchases (in shares)	5,950
Stock options exercised	$ 32	370			402
Stock options exercised (in shares)	12,722
Restricted stock awards	$ 17	(17)
Restricted stock awards (in shares)	6,602
Stock issued pursuant to restricted stock units.	$ 127	(127)
Stock issued pursuant to restricted stock units (in shares)	50,965
Common stock repurchased - buyback plan	$ (2,853)	(77,287)			(80,140)
Common stock repurchased - buyback plan (in shares)	(1,141,200)
Common stock repurchased	$ (73)	(1,890)			(1,963)
Common stock repurchased (in shares)	(29,001)
Share-based compensation expense		4,357			4,357
Balance at Jun. 30, 2019	$ 86,839	$ 1,676,229	$ 609,444	$ 1,466	$ 2,373,978
Balance (in shares) at Jun. 30, 2019	34,735,587				34,735,587

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statements of Changes in Shareholders' Equity
Cash dividends declared, per share (in dollars per share)	$ 0.78	$ 0.67

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 85,827	$ 82,785
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,837	18,025
Provision for loan losses	5,192	6,932
Deferred income taxes	1,457	5,517
(Gains) losses on sale of securities, net	(2,250)	641
Share-based compensation expense	4,357	4,353
Accretion of discount related to performing acquired loans	(6,518)	(17,251)
Loss on disposal of premises and equipment	3,723	1,266
Gain on sale of OREO	(380)	(204)
Net amortization of premiums on investment securities	3,325	3,843
OREO write downs	487	932
Fair value adjustment for loans held for sale	730	(208)
Originations and purchases of loans held for sale	(331,662)	(324,803)
Proceeds from sales of loans	306,062	358,929
Net change in:
Accrued interest receivable	(2,653)	(1,023)
Prepaid assets	(2,025)	(52)
Operating Leases	504
Miscellaneous other assets	(38,129)	8,819
Accrued interest payable	1,449	1,093
Accrued income taxes	470	6,404
Miscellaneous other liabilities	53,454	4,188
Net cash provided by operating activities	100,257	160,186
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale	189,327	51,822
Proceeds from maturities and calls of investment securities held to maturity		2,030
Proceeds from maturities and calls of investment securities available for sale	113,039	114,825
Proceeds from sales of other investment securities	45	13,175
Purchases of investment securities available for sale	(463,473)	(130,378)
Purchases of other investment securities	(23,566)	(9,356)
Net increase in loans	(214,785)	(207,909)
Recoveries of loans previously charged off	1,949	2,104
Purchases of premises and equipment	(8,116)	(7,268)
Proceeds from sale of OREO	4,428	3,722
Proceeds from sale of premises and equipment	8	18
Net cash used in investing activities	(401,144)	(167,215)
Cash flows from financing activities:
Net increase in deposits	275,346	106,135
Net increase in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	27,381	45,112
Proceeds from FHLB advances	700,001	260,001
Repayment of other borrowings	(150,004)	(360,003)
Common stock issuance	343	352
Common stock repurchase	(82,103)	(1,726)
Dividends paid on common stock	(27,491)	(24,651)
Stock options exercised	402	1,031
Net cash provided by financing activities	743,875	26,251
Net increase in cash and cash equivalents	442,988	19,222
Cash and cash equivalents at beginning of period	408,983	377,627
Cash and cash equivalents at end of period	851,971	396,849
Cash paid for:
Interest	41,476	20,152
Income taxes	20,903	11,796
Initial measurement and recognition of operating lease assets in exchange for lease liabilities per ASU 2016-02	82,160
Recognition of operating lease assets in exchange for lease liabilities	4,950
Acquisitions:
Fair value of tangible assets acquired		(7,068)
Other intangible assets acquired		3,321
Liabilities assumed		(612)
Net identifiable assets acquired over liabilities assumed		(3,135)
Real estate acquired in full or in partial settlement of loans	$ 7,632	$ 10,259

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Basis of Presentation
Basis of Presentation	Note 1 — Basis of Presentation ​ The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Certain prior period information has been reclassified to conform to the current period presentation, and these reclassifications had no impact on net income or equity as previously reported. Operating results for the three and six months ended June 30, 201 ​ The condensed consolidated balance sheet at December 31, 2018 has been derived from the audited financial statements at that date but does not include all of the information and disclosures required by GAAP for complete financial statements.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	Note 2 — Summary of Significant Accounting Policies ​ The information contained in the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2018 , as filed with the Securities and Exchange Commission (the “SEC”) on February 22, 2019, should be referenced when reading these unaudited condensed consolidated financial statements. Unless otherwise mentioned or unless the context requires otherwise, references herein to “South State,” the “Company” “we,” “us,” “our” or similar references mean South State Corporation and its consolidated subsidiary. References to the “Bank” means South State Corporation’s wholly owned subsidiary, South State Bank, a South Carolina banking corporation. ​ Leases (Topic 842) and Method of Adoption ​ On January 1, 2019, we adopted the requirements of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842). Topic 842 was subsequently amended by ASU No. 2018-01, Land Easement Practical Expedient for Transition to Topic 842; ASU No. 2018-10, Codification Improvements to Topic 842, Leases; ASU No. 2018-11, Targeted Improvements; and ASU No. 2019-01, Codification Improvements to Topic 842 Leases. The purpose of the update was to increase transparency and comparability between organizations that enter into lease agreements. The key difference between the previous guidance and the update is the recognition of a right-of-use asset (ROU) and lease liability on the statement of financial position for those leases previously classified as operating leases under the old guidance. Accounting Standards Codification (“ASC”) Topic 842 defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In applying this standard, we reviewed our material contracts to determine if they included a lease by this new definition and did not identify any new leases. Our lease agreements in which ASC Topic 842 has been applied are primarily for real estate properties, including retail branch locations, operations and administration locations and stand-alone ATM locations. These leases have lease terms from greater than 12 months to leases with . Related to lease payment terms, some are fixed payments or based on a fixed annual increases while others are variable and the annual increases are based on market rates. We performed an analysis on equipment leases for the implementation of ASC Topic 842 and determined the number and dollar amount of our equipment leases was not material. ​ A modified retrospective transition approach is required, applying the new standard to all leases existing at the date of initial application. An entity may choose to use either (1) its effective date or (2) the beginning of the earliest comparative period presented in the financial statements as its date of initial application. We chose the transition method of adoption provided by ASU 2018-11, Leases (Topic 842) – Targeted Improvements, where we initially apply the new lease standard at the effective date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption if applicable. Therefore, we applied this standard to all existing leases as of the adoption date of January 1, 2019, recording a ROU asset and a lease liability in an equal amount. We did not have a cumulative-effect adjustment to the opening balance of retained earnings. With this transition method, we did not have to restate comparative prior periods presented in the financial statements related to ASC Topic 842, but will present comparative prior periods disclosures using the previous accounting guidance for leases. This adoption method is considered a change in accounting principle requiring additional disclosure of the nature of and reason for the change, which is solely a result of the adoption of the required standard. ​ ASC Topic 842 provides a package of practical expedients in applying the lease standard that had to be chosen at the date of adoption. We chose to elect this package of practical expedients. With this election, we do not have to reassess whether any expired or existing contracts are or contain a lease, do not have to reassess the classification of any expired or existing leases, do not have to separate lease and non-lease components and can account for both as a single lease component, and do not have to reassess initial direct costs or cash incentives for any existing leases due to immateriality. In addition, we chose not to apply ASC Topic 842 to short-term leases (leases with terms of 12 months or less) and not to record an underlying ROU asset or lease liability based on the uncertainty around the renewal of these leases. We will recognize lease expense for such 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 obligation to make lease payments arising from the lease. We determined that we do not have any leases classified as finance leases and that all of our leases are operating leases. ROU assets and liabilities for operating leases are recognized at commencement date based on present value of lease payments not yet paid, discounted using the discount rate for the lease at the lease commencement date over the lease term. For operating leases, lease expense is determined by the sum of the lease payments to be recognized on a straight-line basis over the lease term. Based on the transition method that we chose to follow, the commencement date of the lease term for all existing leases is January 1, 2019. The lease term used for the calculation of the initial ROU asset and lease liability will include the initial lease term in addition to any renewal options or termination costs in the lease that we think are reasonably certain to be exercised or incurred. We received input from several levels of management and our corporate real estate department in determining which options were reasonably certain to be exercised. A discount rate is also needed in the calculation of the initial ROU assets and lease liability. ASC Topic 842 requires that the implicit rate within the lease agreement be used if available. If not available, we should use its incremental borrowing rate in effect at the time of the lease commencement date. We looked at the incremental borrowing rate from several of our borrowing sources to determine an average rate to be used in the calculation of the initial ROU asset and lease liability. We also considered the term of the borrowings as they relate to the terms of the leases. ​ The adoption of the new standard had a material impact on our consolidated balance sheet, with the recording of ROU asset and lease liability of $82.2 million at the commencement date of January 1, 2019. We did not have a cumulative-effect adjustment to the opening balance of retained earnings at commencement. As of June 30, 2019, we had ROU assets of million recorded within other liabilities on the balance sheet. The adoption of ASC Topic 842 did not have a material impact on our consolidated income statement. ​ Revenue from Contracts with Customers (Topic 606) and Method of Adoption ​ On January 1, 2018, we adopted the requirements of ASU 2014-09, Revenue from Contracts with Customers (“Topic 606”). The majority of our revenue is derived primarily from interest income from receivables (loans) and securities. Other revenues are derived from fees received in connection with deposit accounts, mortgage banking activities including gains from the sale of loans and loan origination fees, and trust and investment advisory services. The core principle of the new standard is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ​ We adopted Topic 606 using the retrospective transition approach which requires restatement of prior periods. We selected this method even though there were no material changes in the timing of revenue recognition due to the fact that Topic 606 requires us to report network costs associated with debit card and ATM transactions netted against the related fees from such transactions. Previously, such network costs were reported as a component of other noninterest expense. We did restate prior periods through March 31, 2018 for this reclassification. This adoption method is considered a change in accounting principle requiring additional disclosure of the nature of and reason for the change, which is solely a result of the adoption of the required standard. When applying the retrospective approach under Topic 606, we elected, as a practical expedient, to apply the revenue standard only to contracts that are not completed as of January 1, 2018. A completed contract is considered to be a contract for which all (or substantially all) of the revenue was recognized in accordance with revenue guidance that was in effect before January 1, 2018. There were no uncompleted contracts as of January 1, 2018 for which application of the new standard required an adjustment to retained earnings. ​ The following disclosures related to Topic 606 involve income derived from contracts with customers. Within the scope of Topic 606, we maintain contracts to provide services, primarily for investment advisory and/or custody of assets. Through our wholly-owned subsidiaries, the Bank and South State Advisory, Inc., we contract with our customers to perform IRA, Trust, and/or Custody and Agency advisory services. million, respectively, for the six months ended June 30, 2019 and 2018. The Bank contracts with our customers to perform deposit account services. Total revenue recognized from these contracts with customers is million, respectively, for the six months ended June 30, 2019 and 2018. Due to the nature of our relationship with the customers that we provide services, we do not incur costs to obtain contracts and there are no material incremental costs to fulfill these contracts that should be capitalized. ​ Disaggregation of Revenue - million, respectively, for the six months ended June 30, 2019 and 2018. Total revenue derived from contracts in which services are transferred over time was million, respectively, for the six months ended June 30, 2019 and 2018. Revenue is recognized as the services are provided to the customers. Economic factors impacting the customers could affect the nature, amount, and timing of these cash flows, as unfavorable economic conditions could impair the customers’ ability to provide payment for services. This risk is mitigated as we generally deduct payments from customers’ accounts as services are rendered. ​ Contract Balances - The timing of revenue recognition, billings, and cash collections results in billed accounts receivable on our balance sheet. Most contracts call for payment by a charge or deduction to the respective customer account but there are some that require a receipt of payment from the customer. For fee per transaction contracts, the customers are billed as the transactions are processed. For hourly rate and monthly service contracts related to trust and some investment revenues, the customers are billed monthly (generally as a percentage basis point of the market value of the investment account). In some cases, specific to South State Advisory, Inc., customers are billed in advance for quarterly services to be performed based on the past quarter’s average account balance. These do create contract liabilities or deferred revenue, as the customers pay in advance for service. Neither the contract liabilities nor the accounts receivables balances are material to our balance sheet. ​ Performance Obligations - A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in Topic 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The performance obligations for these contracts are satisfied as the service is provided to the customer (either over time or at a point in time). The payment terms of the contracts are typically based on a basis point percentage of the investment account market value, fee per hour of service, or fee for service incurred. There are no significant financing components in the contracts. Excluding deposit services revenues which are mostly billed at a point in time as a fee for services incurred, all other contracts within the scope of Topic 606 contain variable consideration in that fees earned are derived from market values of accounts or from hours worked for services performed which determines the amount of consideration to which we are entitled. The variability is resolved when the hours are incurred or services are provided. The contracts do not include obligations for returns, refunds, or warranties. The contracts are specific to the amounts owed to the Company for services performed during a period should the contracts be terminated. ​ Significant Judgments - Revenue is recognized as services are billed to the customers. Variable consideration does exist for contracts related to our trust and investment services as revenues are based on market values and services performed. We have adopted the right-to-invoice practical expedient for trust management contracts through the Bank which we contract with our customers to perform IRA, trust, and/or custody services.

Recent Accounting and Regulator

Recent Accounting and Regulatory Pronouncements	6 Months Ended
	Jun. 30, 2019
Recent Accounting and Regulatory Pronouncements
Recent Accounting and Regulatory Pronouncements	Note 3 — Recent Accounting and Regulatory Pronouncements ​ Accounting Standards Adopted in 2019 In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASC Topic 842 related to leases. ASC Topic 842 applies a right-of-use, which we refer to herein as ROU, model that requires a lessee to record, for all leases with a lease term of more than 12 months, an asset representing its right to use the underlying asset and a liability to make lease payments. For leases with a term of 12 months or less, a practical expedient is available whereby a lessee may elect, by class of underlying asset, not to recognize an ROU asset or lease liability. At inception, lessees must classify all leases as either finance or operating based on five criteria. Balance sheet recognition of finance and operating leases is similar, but the pattern of expense recognition in the income statement, as well as the effect on the statement of cash flows, differs depending on the lease classification. In July 2018, ASU 2018-11 - Targeted Improvements - Leases (Topic 842) (“ASU 2018-11”) was issued which provided targeted improvements related to ASC Topic 842. ASU 2018-11 updates the new lease standard ASC Topic 842 by providing another transition method in addition to the existing transition method by allowing entities to initially apply the new leases standard at the adoption date instead of at the beginning of the earliest period presented in the financial statements as required in the original pronouncement. ASU 2018-11 also provides updated guidance for lessors related to separating lease and nonlease components in a contract and allocating the consideration in the contract to the separate components. In December 2018, the FASB issued ASU No. 2018-20, Leases (Topic 842): Narrow-Scope Improvements for Lessors (“ASU 2018-20”) . ASU 2018-20 updates the new lease standard ASC Topic 842 by addressing several issues related to lessors which should reduce lessors’ implementation and ongoing costs related to the new lease standard. In March 2019, the FASB issued ASU No. 2019-01, Leases (Topic 842): Codification Improvements (“ASU 2019-01”) . ASU 2019-01 provides clarification on several issues related to ASC Topic 842. None of these issues had a material effect on our financial statements. For public business entities, the amendments in ASU 2016-02, ASU 2018-11, ASU 2018-20 and ASU 2019-01 are effective for interim and annual periods beginning after December 15, 2018. In transition, lessees and lessors have the choice to recognize and measure leases at the beginning of the earliest period presented in financials using a modified retrospective approach or to allow the entity to recognize and measure leases as of the adoption date and not in comparative periods. We chose the option to recognize and measure leases as of the adoption date and not in comparative periods. See Note 2 – Summary of Significant Accounting Policies and Note 7 – Leases for further discussion around the adoption of these standards related to leases. On January 1, ​ In October 2018, the FASB issued ASU No. 2018-16, Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes (Derivatives and Hedging - Topic 815) (“ASU 2018-16”) . The amendments in this ASU permit the OIS rate based on SOFR as a U.S. benchmark interest rate. Including the OIS rate based on SOFR as an eligible benchmark interest rate during the early stages of the marketplace transition provides sufficient lead time for entities to prepare for changes to interest rate risk hedging strategies for both risk management and hedge accounting purposes. The guidance is effective for public companies for annual periods beginning on or after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption. This guidance became effective on January 1, 2019 and did not have a material impact to our consolidated financial statements. ​ In August 2018, the FASB issued ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (Subtopic 350-40) (“ASU 2018-15”) . This ASU clarifies certain aspects of ASU 2015-05, Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement affect the accounting for the service element of a hosting arrangement that is a service contract. An entity would expense the capitalized implementation costs related to a hosting arrangement that is a service contract over the hosting arrangement’s term, which comprises the arrangement’s noncancelable term and any renewal options whose exercise is reasonably certain. The expense would be presented in the same line item in the statement of income as that in which the fee associated with the hosting arrangement is presented. For public business entities, the amendments in ASU 2018-15 are effective for interim and annual periods beginning after December 15, 2019 and an entity has the option of using either a retrospective or prospective transition method. Early adoption is permitted. We early adopted this standard as of January 1, 2019, but it did not have a material impact on our consolidated financial statements. There were in capitalized implementation costs in the second quarter of 2019 related to internal use software for a front capture software product for running customer banking transactions at branch locations. These costs are being held in a suspense account classified as premises and equipment on the balance sheet until the project is complete when they will then begin to be depreciated. ​ In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). ASU 2017-12 amends ASU 2018-16 to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. These amendments will improve the transparency of information about an entity’s risk management activities and simplify the application of hedge accounting. The guidance is effective for public companies for annual periods beginning on or after December 15, 2018 and interim periods within those fiscal years. All transition requirements and elections should be applied to hedging relationships existing on the date of adoption. This guidance became effective on January 1, 2019 and we determined that the implementation of this standard did not have a material impact to our consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Receivables-Nonrefundable Fees and Other Cost (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities; ASU 2017-08 shortens the amortization period of the premium for certain callable debt securities, from the contractual maturity date to the earliest call date. The amendments do not require an accounting change for securities held at a discount; an entity will continue to amortize to the contractual maturity date the discount related to callable debt securities. The amendments apply to the amortization of premiums on callable debt securities with explicit, noncontingent call features that are callable at fixed prices on preset dates. For public business entities, ASU 2017-08 is effective in fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. For entities other than public business entities, the amendments are effective in fiscal years beginning after December 15, 2019 and in interim periods in fiscal years beginning after December 15, 2020. Early adoption is permitted for all entities, including in an interim period. The amendments should be applied on a modified retrospective basis, with a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the amendments are adopted. Accounting Standards Adopted in 2018 In February 2018, the FASB issued ASU No. 2018-03, Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10) (“ASU 2018-03”). ASU 2018-03 updates the new financial instruments standard by clarifying issues that arose from ASU 2016-01, but does not change the core principle of the new standard. The issues addressed in this ASU include: (1) Equity securities without a readily determinable fair value-discontinuation, (2) Equity securities without a readily determinable fair value-adjustments, (3) Forward contracts and purchased options, (4) Presentation requirements for certain fair value option liabilities, (5) Fair value option liabilities denominated in a foreign currency, (6) Transition guidance for equity securities without a readily determinable fair value, and (7) Transition and open effective date information. For public business entities, the amendments in ASU 2018-03 and ASU 2016-01 are effective for interim and annual periods beginning after December 15, 2017. An entity should apply the amendments by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. The amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively to equity investments that exist as of the date of adoption of ASU 2018-03 and ASU 2016-01. This guidance became effective on January 1, 2018 and we determined that the implementation of this standard did not have a material impact to our consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”). ASU 2018-02 amends ASC Topic 220 and allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 (the “Tax Reform Act”). Consequently, this amendment eliminates the stranded tax effects resulting from the Tax Reform Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of the Tax Reform Act, the underlying guidance that requires that the effects of the change in tax laws or rates be included in income from continuing operations is not affected. The guidance is effective for public companies for annual periods beginning on or after December 15, 2018 and interim periods within those fiscal years. Early adoption was permitted, including adoption in any interim period, (1) for public business entities for reporting periods for which financial statements have not yet been issued and (2) for all other entities for reporting periods for which financial statements have not yet been made available for issuance. This amendment should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in U.S. federal corporate income tax rate in the Tax Reform Act is recognized. We early adopted this amendment in the first quarter of 2018 and reclassified million from accumulated other comprehensive income to retained earnings for the stranded tax effects resulting from the Tax Reform Act. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting (“ASU 2017-09”). ASU 2017-09 provides clarity by offering guidance on the scope of modification accounting for share-based payment awards and gives direction on which changes to the terms or conditions of these awards require an entity to apply modification accounting. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or a liability) changes as a result of the change in terms or conditions. The guidance is effective prospectively for all companies for annual periods beginning on or after December 15, 2017. We adopted this standard in the first quarter of 2018 and determined that this guidance did not have a material impact on our consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). ASU 2017-07 applies to any employer that sponsors a defined benefit pension plan, other postretirement benefit plan, or other types of benefits accounted for under Topic 715. The amendments require that an employer disaggregate the service cost component from the other components of net benefit cost, as follows (1) service cost must be presented in the same line item(s) as other employee compensation costs, which costs are generally included within income from continuing operations, but in some cases may be eligible for capitalization, (2) all other components of net benefit cost must be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented, and (3) the amendments permit capitalizing only the service cost component of net benefit cost, assuming such costs meet the criteria required for capitalization by other GAAP , rather than total net benefit cost which has been permitted under prior GAAP. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those years. The amendments should be adopted prospectively and allows a practical expedient that permits an employer to use the amounts disclosed in its pension and other postretirement benefit plan note for the prior periods to apply the retrospective presentation requirements. We adopted this standard in the first quarter of 2018 and determined that this guidance did not have a material impact on our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (“ASU 2017-01”). These amendments are intended to clarify the definition of a business to assist companies and other reporting entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 requires an entity to evaluate if substantially all of the fair value of the gross assets acquired are concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the set of transferred assets and activities is not a business. The guidance also requires a business to include at least one substantive process and narrows the definition of outputs by more closely aligning it with how outputs are described in ASC Topic 606. The guidance is effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those years. We adopted this standard in the first quarter of 2018 and determined that this guidance did not have a material impact on our consolidated financial statements. In December 2016, the FASB issued ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers (“ASU 2016-20”). ASU 2016-20 updates the new revenue standard by clarifying issues that arose from ASU 2014-09, but does not change the core principle of the new standard. The issues addressed in this ASU include: (1) Loan guarantee fees, (2) Impairment testing of contract costs, (3) Interaction of impairment testing with guidance in other topics, (4) Provisions for losses on construction-type and production-type contracts, (5) Scope of topic 606, (6) Disclosure of remaining performance obligations, (7) Disclosure of prior-period performance obligations, (8) Contract modifications, (9) Contract asset vs. receivable, (10) Refund liability, (11) Advertising costs, (12) Fixed-odds wagering contracts in the casino industry, (13) Cost capitalization for advisors to private funds and public funds. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2017. The amendments can be applied retrospectively to each prior reporting period or retrospectively with the cumulative effect of initially applying this new guidance recognized at the date of initial application. Our revenue includes net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and noninterest income. ASU 2016-20, ASU 2016-08 and ASU 2014-09 became effective on January 1, 2018 and we refined our disclosures around the standard in the first quarter of 2018. See Note 2 – Summary of Significant Accounting Policies for additional information. We determined that there is no material change on how we recognize our revenue streams and the adoption of these standards did not have a material impact on our consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15 , Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 addresses eight classification issues related to the statement of cash flows: Debt prepayment or debt extinguishment costs; Settlement of zero-coupon bonds; Contingent consideration payments made after a business combination; Proceeds from the settlement of insurance claims; Proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; Distributions received from equity method investees; Beneficial interests in securitization transactions; and Separately identifiable cash flows and application of the predominance principle. The updated guidance is effective for interim and annual reporting periods beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. Entities will apply the standard’s provisions using a retrospective transition method to each period presented. We adopted this standard in the first quarter of 2018 and determined that this guidance did not have a material impact on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent considerations (Reporting Revenue Gross versus Net) (“ASU 2016-08”). ASU 2016-08 updates the new revenue standard by clarifying the principal versus agent implementation guidance, but does not change the core principle of the new standard. The updates to the principal versus agent guidance: (i) require an entity to determine whether it is a principal or an agent for each distinct good or service (or a distinct bundle of goods or services) to be provided to the customer; (ii) illustrate how an entity that is a principal might apply the control principle to goods, services, or rights to services, when another party is involved in providing goods or services to a customer and (iii) Clarify that the purpose of certain specific control indicators is to support or assist in the assessment of whether an entity controls a good or service before it is transferred to the customer, provide more specific guidance on how the indicators should be considered, and clarify that their relevance will vary depending on the facts and circumstances. For public business entities, the effective date and transition requirements for these amendments are the same as the effective date and transition requirements of ASU 2014-09 which is effective for interim and annual periods beginning after December 15, 2017. The amendments can be applied retrospectively to each prior reporting period or retrospectively with the cumulative effect of initially applying this new guidance recognized at the date of initial application. Our revenue includes net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and noninterest income. ASU 2016-20, ASU 2016-08 and ASU 2014-09 became effective on January 1, 2018 and we refined its disclosures around the standard in the first quarter of 2018. We determined that there is no material change on how we recognize our revenue streams and the adoption of these standards did not have a material impact on our consolidated financial statements, other than the required disclosures and the reclassification of interchange costs from noninterest expense to noninterest income on the Consolidated Statement of Income which we applied retrospectively to each prior reporting period. See further discussion in Note 2 – Summary of Significant Accounting Policies. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments – Overall (Subtopic 825-10); Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). This update is intended to improve the recognition and measurement of financial instruments and it requires an entity to: (i) measure equity investments at fair value through net income, with certain exceptions; (ii) present in other comprehensive income the changes in instrument-specific credit risk for financial liabilities measured using the fair value option; (iii) present financial assets and financial liabilities by measurement category and form of financial asset; (iv) calculate the fair value of financial instruments for disclosure purposes based on an exit price; and (v) assess a valuation allowance on deferred tax assets related to unrealized losses of AFS debt securities in combination with other deferred tax assets. ASU 2016-01 also provides an election to subsequently measure certain nonmarketable equity investments at cost less any impairment and adjusted for certain observable price changes and requires a qualitative impairment assessment of such equity investments and amends certain fair value disclosure requirements. For public business entities, the amendments in ASU 2016-01 are effective for interim and annual periods beginning after December 15, 2017. An entity should apply the amendments by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption. The amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively to equity investments that exist as of the date of adoption of the ASU 2016-01. This guidance became effective on January 1, 2018 and we determined that the implementation of this standard did not have a material impact to our consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, Topic 606 Revenue from Contracts with Customers, Topic 606: Deferral of the Effective Date, ASU 2014-09 until annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. The amendments can be applied retrospectively to each prior reporting period or retrospectively with the cumulative effect of initially applying this new guidance recognized at the date of initial application. Our revenue includes net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and noninterest income. ASU 2016-20, ASU 2016-08 and ASU 2014-09 became effective on January 1, 2018 and we refined our disclosures around the standard in the first quarter of 2018. See Note 2 – Summary of Significant Accounting Policies for additional information. We determined that there is no material change on how we recognize our revenue streams, other than the required disclosures and the reclassification of interchange costs from noninterest expense to noninterest income on the Consolidated Statement of Income which we applied retrospectively to each prior reporting period. Issued But Not Yet Adopted Accounting Standards In April 2019, the FASB issued ASU No. 2019-05, Targeted Transition Relief (Topic 326 – Financial Instruments-Credit Losses). 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the overall guidance is adopted. ​ In April 2019, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. This update related to ASU 2016-01, ASU 2017-12 and ASU 2016-13 clarifies certain aspects brought to the Account Standards Board attention by stakeholders related to these ASUs, but does not change the core principles of these standards. The clarifications related to ASU 2016-01 and 2017-12 will be adopted this quarter since these standards have already been adopted. The clarifications related to ASU 2016-13 will be adopted in the first quarter of 2020 when the overall standard will be adopted. The clarification related to ASU 2016-01 and ASU 2017-12 did not have a material impact on our consolidated financial statements. The clarification related to ASU 2016-13 are still being evaluated as are the effects of the overall standard on our consolidated financial statements. ​ In August 2018, the FASB issued ASU No. 2018-14, Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans (Subtopic 715-20) (“ASU 2018-14”) . ASU 2018-14 amends ASC 715-20 to add, remove, and clarify disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. For public business entities, ASU 2018-14 is effective for fiscal years ending after December 15, 2020 and requires entities to apply the amendment on a retrospective basis. Early adoption is permitted. At this point in time, we do not expect that this guidance will have a material impact on our consolidated financial statements. ​ In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement (Topic 820) (“ASU 2018-13”) . ASU 2018-13 removes, modifies, and adds certain disclosure requirements in ASC 820 related to Fair Value Measurement on the basis of the concepts in the FASB Concepts Statement Conceptual Framework for Financial Reporting — Chapter 8: Notes to Financial Statements . ASU 2018-13 is effective for all entities for fiscal years beginning after December 15, 2019, including interim periods therein. Early adoption is permitted upon issuance of this ASU, including in any interim period for which financial statements have not yet been issued or made available for issuance. Entities making this election are permitted to early adopt the eliminated or modified disclosure requirements and delay the adoption of all the new disclosure requirements until their effective date. The ASU requires application of the prospective method of transition (for only the most recent interim or annual period presented in the initial fiscal year of adoption) to the new disclosure requirement additions. The ASU also requires prospective application to any modifications to disclosures made because of the change to the requirements for the narrative description of measurement uncertainty. The effects of all other amendments made by the ASU must be applied retrospectively to all periods presented. The Company is still assessing the impact of this new guidance, but does not believe it will have a material impact on the Company’s consolidated financial statements. ​ In January 2017, the FASB issued ASU No. 2017-04, Intangible-Goodwill and other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). ASU 2017-04 simplifies the accounting for goodwill impairment for all entities by requiring impairment charges to be based on the first step in today’s two-step impairment test under ASC Topic 350 and eliminating Step 2 from the goodwill impairment test. As amended, the goodwill impairment test will consist of one step comparing the fair value of a reporting unit with its carrying amount. An entity should recognize a goodwill impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The guidance is effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those years. The amendments should be adopted prospectively and early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We are still assessing the impact of this new guidance, but at this point in time, do not believe it will have a material impact on our consolidated financial statements. ​ In June 2016, the FASB issued ASU No. 2016-13 , Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 requires an entity to utilize a new impairment model known as the current expected credit loss (“CECL”) model to estimate its lifetime “expected credit loss” and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in earlier recognition of credit losses for loans, investment securities portfolio, and purchased financial assets with credit deterioration. ASU 2016-13 also will require enhanced disclosures. The new guidance is effective for interim and annual reporting periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. A cross-functional working group comprised of individuals from credit administration, risk management, accounting and finance, information technology, among others are in place implementing and developing the data, forecast, processes, and portfolio segmentation that will be used in the models that will estimate the expected credit loss for loan segments. We have determined a preliminary baseline model result for each loan segment based upon our of historical losses. These credit models are currently being validated by Model Risk Management. We are currently determining the qualitative framework that will be applied to the loan segments which will allow for a reasonable estimate upon adoption of ASU 2016-13. We have also contracted with a third party vendor solution to assist us in the application and analysis of ASU 2016-13 in aggregating the results of the models and provide macroeconomic forecast for the markets served relative to the loan segments. We are currently unable to reasonably estimate the full impact of adopting ASU 2016-13, and it will be influenced by the composition, characteristics and quality of our loan and securities portfolio, as well as the economic conditions and forecasts as of each reporting period. These economic conditions and forecasts could be significantly different in future periods. ​

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2019
Investment Securities
Investment Securities	Note 4 — Investment Securities ​ The following is the amortized cost and fair value of investment securities held to maturity: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (Dollars in thousands) Cost Gains Losses Value June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ — ​ $ — ​ $ — ​ $ — ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ — ​ $ — ​ $ — ​ $ — ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 499 ​ $ 4 ​ $ — ​ $ 503 ​ ​ The following is the amortized cost and fair value of investment securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (Dollars in thousands) Cost Gains Losses Value June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt* ​ $ 65,604 ​ $ 933 ​ $ (8) ​ $ 66,529 ​ State and municipal obligations ​ 177,533 ​ 4,614 ​ (1) ​ 182,146 ​ Mortgage-backed securities** ​ 1,457,544 ​ 13,983 ​ (2,926) ​ 1,468,601 ​ ​ ​ $ 1,700,681 ​ $ 19,530 ​ $ (2,935) ​ $ 1,717,276 ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt* ​ $ 48,982 ​ $ 21 ​ $ (752) ​ $ 48,251 ​ State and municipal obligations ​ 200,184 ​ 1,709 ​ (1,125) ​ 200,768 ​ Mortgage-backed securities** ​ 1,291,484 ​ 697 ​ (24,133) ​ 1,268,048 ​ ​ ​ $ 1,540,650 ​ $ 2,427 ​ $ (26,010) ​ $ 1,517,067 ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt* ​ $ 48,933 ​ $ — ​ $ (1,320) ​ $ 47,613 ​ State and municipal obligations ​ 223,533 ​ 1,932 ​ (1,649) ​ 223,816 ​ Mortgage-backed securities** ​ 1,342,105 ​ 110 ​ (35,645) ​ 1,306,570 ​ ​ ​ $ 1,614,571 ​ $ 2,042 ​ $ (38,614) ​ $ 1,577,999 ​ * - Our government-sponsored entities holdings are comprised of debt securities offered by Federal Home Loan Mortgage Corporation (“FHLMC”) or Freddie Mac, Federal National Mortgage Association (“FNMA”) or Fannie Mae, Federal Home Loan Bank (“FHLB”), and Federal Farm Credit Banks (“FFCB”). ** - All of the mortgage-backed securities are issued by government-sponsored entities; there are no private-label holdings. Also, included in our mortgage-backed securities are debt securities offered by the Small Business Administration (“SBA”), which have the full faith and credit backing of the United States Government. ​ The following is the amortized cost and carrying value of other investment securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying (Dollars in thousands) Value June 30, 2019: ​ ​ ​ ​ Federal Home Loan Bank stock ​ $ 43,044 ​ Investment in unconsolidated subsidiaries ​ 3,563 ​ Other nonmarketable investment securities ​ 2,517 ​ ​ ​ $ 49,124 ​ December 31, 2018: ​ ​ ​ ​ Federal Home Loan Bank stock ​ $ 19,524 ​ Investment in unconsolidated subsidiaries ​ 3,563 ​ Other nonmarketable investment securities ​ 2,517 ​ ​ ​ $ 25,604 ​ June 30, 2018: ​ ​ ​ ​ Federal Home Loan Bank stock ​ $ 13,149 ​ Investment in unconsolidated subsidiaries ​ 3,563 ​ Other nonmarketable investment securities ​ 2,517 ​ ​ ​ $ 19,229 ​ ​ Our other investment securities consist of non-marketable equity securities that have no readily determinable market value. Accordingly, when evaluating these securities for impairment, management considers the ultimate recoverability of the par value rather than recognizing temporary declines in value. As of June 30, 2019, we determined that there was no impairment on its other investment securities. ​ The amortized cost and fair value of debt and equity securities at June 30, 2019 by contractual maturity are detailed below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities ​ Securities ​ ​ Held to Maturity ​ Available for Sale ​ ​ Amortized ​ Fair ​ Amortized ​ Fair (Dollars in thousands) Cost Value Cost Value Due in one year or less $ — ​ $ — $ 11,037 $ 11,038 ​ Due after one year through five years ​ — ​ — ​ 52,053 ​ 52,764 ​ Due after five years through ten years ​ — ​ — ​ 402,345 ​ 408,027 ​ Due after ten years ​ — ​ — ​ 1,235,246 ​ 1,245,447 ​ ​ ​ $ — ​ $ — ​ $ 1,700,681 ​ $ 1,717,276 ​ ​ Information pertaining to our securities with gross unrealized losses at June 30, 2019, December 31, 2018 and June 30, 2018, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than ​ Twelve Months ​ ​ Twelve Months ​ or More ​ ​ Gross ​ ​ ​ ​ Gross ​ ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair (Dollars in thousands) Losses Value Losses Value June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities Available for Sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ $ — ​ $ — ​ $ 8 ​ $ 5,742 ​ State and municipal obligations ​ — ​ 1,490 ​ 1 ​ 1,153 ​ Mortgage-backed securities ​ 324 ​ 64,960 ​ 2,602 ​ 330,213 ​ ​ ​ $ 324 ​ $ 66,450 ​ $ 2,611 ​ $ 337,108 ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities Available for Sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ $ 100 ​ $ 10,571 ​ $ 652 ​ $ 32,959 ​ State and municipal obligations ​ 760 ​ 40,387 ​ 365 ​ 14,231 ​ Mortgage-backed securities ​ 5,182 ​ 405,055 ​ 18,951 ​ 755,223 ​ ​ ​ $ 6,042 ​ $ 456,013 ​ $ 19,968 ​ $ 802,413 ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities Available for Sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ $ 1,179 ​ $ 39,145 ​ $ 141 ​ $ 8,468 ​ State and municipal obligations ​ 1,617 ​ 77,373 ​ 32 ​ 1,348 ​ Mortgage-backed securities ​ 21,494 ​ 946,142 ​ 14,151 ​ 331,871 ​ ​ ​ $ 24,290 ​ $ 1,062,660 ​ $ 14,324 ​ $ 341,687 ​ ​ Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. Consideration is given to (1) the financial condition and near-term prospects of the issuer, (2) the outlook for receiving the contractual cash flows of the investments, (3) the length of time and the extent to which the fair value has been less than cost, (4) our intent and ability to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value or for a debt security whether it is more-likely-than-not that we will be required to sell the debt security prior to recovering its fair value, and (5) the anticipated outlook for changes in the general level of interest rates. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, the results of reviews of the issuer’s financial condition, and the issuer’s anticipated ability to pay the contractual cash flows of the investments. All debt securities available for sale in an unrealized loss position as of June 30, 2019 continue to perform as scheduled. As part of our evaluation of its intent and ability to hold investments for a period of time sufficient to allow for any anticipated recovery in the market, we consider our investment strategy, cash flow needs, liquidity position, capital adequacy and interest rate risk position. We do not currently intend to sell the securities within the portfolio and it is not more-likely-than-not that we will be required to sell the debt securities; therefore, management does not consider these investments to be other-than-temporarily impaired at June 30, 2019. ​ Management continues to monitor all of our securities with a high degree of scrutiny. There can be no assurance that we will not conclude in future periods that conditions existing at that time indicate some or all of its securities may be sold or are other than temporarily impaired, which would require a charge to earnings in such periods.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2019
Loans and Allowance for Loan Losses
Loans and Allowance for Loan Losses	Note 5 — Loans and Allowance for Loan Losses ​ The following is a summary of non-acquired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Non-acquired loans: ​ ​ ​ ​ ​ ​ ​ Commercial non-owner occupied real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 879,724 ​ $ 841,445 ​ $ 906,890 ​ Commercial non-owner occupied ​ 1,723,640 ​ 1,415,551 ​ 1,135,235 ​ Total commercial non-owner occupied real estate ​ 2,603,364 ​ 2,256,996 ​ 2,042,125 ​ Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 2,079,949 ​ 1,936,265 ​ 1,733,924 ​ Home equity loans ​ 514,242 ​ 495,148 ​ 456,946 ​ Total consumer real estate ​ 2,594,191 ​ 2,431,413 ​ 2,190,870 ​ Commercial owner occupied real estate ​ 1,589,987 ​ 1,517,551 ​ 1,372,453 ​ Commercial and industrial ​ 1,114,513 ​ 1,054,952 ​ 941,067 ​ Other income producing property ​ 214,203 ​ 214,353 ​ 205,507 ​ Consumer ​ 503,468 ​ 448,664 ​ 416,650 ​ Other loans ​ 1,601 ​ 9,357 ​ 28,867 ​ Total non-acquired loans ​ 8,621,327 ​ 7,933,286 ​ 7,197,539 ​ Less allowance for loan losses ​ (53,590) ​ (51,194) ​ (47,874) ​ Non-acquired loans, net ​ $ 8,567,737 ​ $ 7,882,092 ​ $ 7,149,665 ​ ​ The following is a summary of acquired non-credit impaired loans accounted for under FASB ASC Topic 310-20, net of related discount: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) ​ 2019 ​ 2018 ​ 2018 ​ Acquired non-credit impaired loans: ​ ​ ​ Commercial non-owner occupied real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 60,391 ​ $ 165,070 ​ $ 281,282 ​ Commercial non-owner occupied ​ 595,367 ​ 679,253 ​ 752,465 ​ Total commercial non-owner occupied real estate ​ 655,758 ​ 844,323 ​ 1,033,747 ​ Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 577,284 ​ 628,813 ​ 676,596 ​ Home equity loans ​ 208,777 ​ 242,425 ​ 278,906 ​ Total consumer real estate ​ 786,061 ​ 871,238 ​ 955,502 ​ Commercial owner occupied real estate ​ 376,187 ​ 421,841 ​ 486,254 ​ Commercial and industrial ​ 151,579 ​ 212,537 ​ 304,864 ​ Other income producing property ​ 111,006 ​ 133,110 ​ 169,392 ​ Consumer ​ 99,690 ​ 111,777 ​ 126,665 ​ Acquired non-credit impaired loans ​ $ 2,180,281 ​ $ 2,594,826 ​ $ 3,076,424 ​ ​ The unamortized discount related to the acquired non-credit impaired loans totaled $26.9 million, $33.4 million, and $43.6 million at June 30, 2019, December 31, 2018, and June 30, 2018, respectively. In accordance with FASB ASC Topic 310-30, we aggregated acquired loans that have common risk characteristics into pools of loan categories as described in the table below. The following is a summary of acquired credit impaired loans accounted for under FASB ASC Topic 310-30 (identified as credit impaired at the time of acquisition), net of related discount: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Acquired credit impaired loans: ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ $ 164,540 ​ $ 196,764 ​ $ 227,739 ​ Commercial real estate—construction and development ​ 27,014 ​ 32,942 ​ 40,951 ​ Residential real estate ​ 184,208 ​ 207,482 ​ 229,502 ​ Consumer ​ 38,624 ​ 42,492 ​ 45,633 ​ Commercial and industrial ​ 10,198 ​ 10,043 ​ 12,580 ​ Acquired credit impaired loans ​ 424,584 ​ 489,723 ​ 556,405 ​ Less allowance for loan losses ​ (4,623) ​ (4,604) ​ (4,426) ​ Acquired credit impaired loans, net ​ $ 419,961 ​ $ 485,119 ​ $ 551,979 ​ ​ ​ Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting carrying values of acquired credit impaired loans as of June 30, 2019, December 31, 2018 and June 30, 2018 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Contractual principal and interest ​ $ 538,730 ​ $ 626,691 ​ $ 717,180 ​ Non-accretable difference ​ (18,156) ​ (24,818) ​ (43,397) ​ Cash flows expected to be collected ​ 520,574 ​ 601,873 ​ 673,783 ​ Accretable yield ​ (100,613) ​ (116,754) ​ (121,804) ​ Carrying value ​ $ 419,961 ​ $ 485,119 ​ $ 551,979 ​ ​ Income on acquired credit impaired loans that are not impaired at the acquisition date is recognized in the same manner as loans impaired at the acquisition date. A portion of the fair value discount on acquired non-impaired loans has been ascribed as an accretable yield that is accreted into interest income over the estimated remaining life of the loans. The remaining nonaccretable difference represents cash flows not expected to be collected. ​ The following are changes in the carrying value of acquired credit impaired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, (Dollars in thousands) 2019 2018 Balance at beginning of period ​ $ 485,119 ​ $ 618,803 Net reductions for payments, foreclosures, and accretion ​ (65,139) ​ (67,025) Change in the allowance for loan losses on acquired loans ​ (19) ​ 201 Balance at end of period, net of allowance for loan losses on acquired credit impaired loans ​ $ 419,961 ​ $ 551,979 ​ The table below reflects refined accretable yield balance for acquired credit impaired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, (Dollars in thousands) 2019 2018 Balance at beginning of period ​ $ 116,754 ​ $ 133,096 PSC acquisition Day 1 adjustment ​ ​ — ​ ​ (1,460) Contractual interest income ​ (14,189) ​ (17,050) Accretion on acquired credit impaired loans ​ ​ (10,287) ​ ​ (9,013) Reclass of nonaccretable difference due to improvement in expected cash flows ​ 8,468 ​ 16,453 Other changes, net ​ (133) ​ (222) Balance at end of period ​ $ 100,613 ​ $ 121,804 ​ The table above reflects the changes in the carrying amount of accretable yield for the acquired credit impaired loans and shows both the contractual interest income and incremental accretion for the six months ended June 30, 2019 and 2018. In the first six months of 2019, the accretable yield balance declined by $16.1 million as total contractual interest and accretion income of $24.5 million was recognized. This was partially offset by improved expected cash flows of $8.5 million. The improved cash flows for the prior year was adjusted to accurately reflect the split between income types. ​ As of June 30, 2019, the table above excludes $2.2 billion ($2.2 billion in contractual principal less a $26.9 million discount) in acquired loans which are accounted for under FASB ASC Topic 310-20. These loans were identified as either performing with no discount related to the credit or as a revolving lines of credit (commercial or consumer) at acquisition. As of June 30, 2018, the balance of these acquired loans totaled $3.1 billion ($3.1 billion in contractual principal less a $43.6 million remaining discount). ​ Our loan loss policy adheres to GAAP as well as interagency guidance. The allowance for loan losses, which we sometimes refer to herein as ALLL, is based upon estimates made by management. We maintain an allowance for loan losses at a level that we believe is appropriate to cover estimated credit losses on individually evaluated loans that are determined to be impaired as well as estimated credit losses inherent in the remainder of our loan portfolio. Arriving at the allowance involves a high degree of management judgment and results in a range of estimated losses. We regularly evaluate the adequacy of the allowance through our internal risk rating system, outside credit review, and regulatory agency examinations to assess the quality of the loan portfolio and identify problem loans. The evaluation process also includes our analysis of current economic conditions, composition of the loan portfolio, past due and nonaccrual loans, concentrations of credit, lending policies and procedures, and historical loan loss experience. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on, among other factors, changes in economic conditions in our markets. In addition, regulatory agencies, as an integral part of their examination process, periodically review our allowances for losses on loans. These agencies may require management to recognize additions to the allowances based on their judgments about information available to them at the time of their examination. Because of these and other factors, it is possible that the allowances for losses on loans may change. The provision for loan losses is charged to expense in an amount necessary to maintain the allowance at an appropriate level. The allowance for loan losses on non-acquired loans consists of general and specific reserves. The general reserves are determined by applying loss percentages to the portfolio that are based on historical loss experience for each class of loans and management’s evaluation and “risk grading” of the loan portfolio. Additionally, the general economic and business conditions affecting key lending areas, credit quality trends, collateral values, loan volumes and concentrations, seasoning of the loan portfolio, the findings of internal and external credit reviews and results from external bank regulatory examinations are included in this evaluation. Currently, these adjustments are applied to the non-acquired loan portfolio when estimating the level of reserve required. The specific reserves are determined on a loan-by-loan basis based on management’s evaluation of our exposure for each credit, given the current payment status of the loan and the value of any underlying collateral. These are loans classified by management as doubtful or substandard. For such loans that are also classified as impaired, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. Generally, the need for specific reserve is evaluated on impaired loans, and once a specific reserve is established for a loan, a charge off of that amount occurs in the quarter subsequent to the establishment of the specific reserve. Loans that are determined to be impaired are provided a specific reserve, if necessary, and are excluded from the calculation of the general reserves. Beginning with the First Financial Holdings, Inc. acquisition, we segregated the loan portfolio into performing loans (“non-credit impaired) and purchased credit impaired loans. The performing loans and revolving type loans are accounted for under FASB ASC 310-20, with each loan being accounted for individually. The allowance for loan losses on these loans will be measured and recorded consistent with non-acquired loans. The acquired credit impaired loans will follow the description in the next paragraph. In determining the acquisition date fair value of purchased loans, and in subsequent accounting, we generally aggregate purchased loans into pools of loans with common risk characteristics. Expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level yield method if the timing and amount of the future cash flows of the pool is reasonably estimable. Subsequent to the acquisition date, increases in cash flows over those expected at the acquisition date are reclassified from the non-accretable difference to accretable yield and recognized as interest income prospectively. Decreases in expected cash flows after the acquisition date are recognized by recording an allowance for loan losses. Management analyzes the acquired loan pools using various assessments of risk to determine an expected loss. The expected loss is derived based upon a loss given default based upon the collateral type and/or detailed review by loan officers and the probability of default that is determined based upon historical data at the loan level. All acquired loans managed by Special Asset Management are reviewed quarterly and assigned a loss given default. Acquired loans not managed by Special Asset Management are reviewed twice a year in a similar method to our originated portfolio of loans which follow review thresholds based on risk rating categories. In the fourth quarter of 2015, we modified its methodology to a more granular approach in determining loss given default on substandard loans with a net book balance between $100,000 and $500,000 by adjusting the loss given default to 90% of the most current collateral valuation based on appraised value. Substandard loans greater than $500,000 were individually assigned loss given defaults each quarter. Trends are reviewed in terms of accrual status, past due status, and weighted-average grade of the loans within each of the accounting pools. In addition, the relationship between the change in the unpaid principal balance and change in the mark is assessed to correlate the directional consistency of the expected loss for each pool. An aggregated analysis of the changes in allowance for loan losses is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-acquired Acquired Non-Credit Acquired Credit ​ ​ (Dollars in thousands) ​ Loans ​ Impaired Loans ​ Impaired Loans ​ Total Three Months Ended June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 52,008 ​ $ — ​ $ 4,514 ​ $ 56,522 ​ Loans charged-off ​ (1,327) ​ ​ (1,535) ​ — ​ (2,862) ​ Recoveries of loans previously charged off (1) ​ 875 ​ ​ 116 ​ — ​ 991 ​ Net charge-offs ​ (452) ​ ​ (1,419) ​ — ​ (1,871) ​ Provision for loan losses charged to operations ​ 2,034 ​ ​ 1,419 ​ 251 ​ 3,704 ​ Reduction due to loan removals ​ — ​ ​ — ​ (142) ​ (142) ​ Balance at end of period ​ $ 53,590 ​ $ — ​ $ 4,623 ​ $ 58,213 ​ Three Months Ended June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 45,203 ​ $ — ​ $ 4,084 ​ $ 49,287 ​ Loans charged-off ​ (1,240) ​ ​ (1,183) ​ — ​ (2,423) ​ Recoveries of loans previously charged off (1) ​ 1,051 ​ ​ 87 ​ — ​ 1,138 ​ Net charge-offs ​ (189) ​ ​ (1,096) ​ — ​ (1,285) ​ Provision for loan losses charged to operations ​ 2,860 ​ ​ 1,096 ​ 522 ​ 4,478 ​ Reduction due to loan removals ​ — ​ ​ — ​ (180) ​ (180) ​ Balance at end of period ​ $ 47,874 ​ $ — ​ $ 4,426 ​ $ 52,300 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-acquired Acquired Non-Credit Acquired Credit ​ ​ (Dollars in thousands) ​ Loans ​ Impaired Loans ​ Impaired Loans ​ Total Six Months Ended June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 51,194 ​ $ — ​ $ 4,604 ​ $ 55,798 ​ Loans charged-off ​ (2,572) ​ ​ (1,909) ​ — ​ (4,481) ​ Recoveries of loans previously charged off (1) ​ 1,627 ​ ​ 322 ​ — ​ 1,949 ​ Net charge-offs ​ (945) ​ ​ (1,587) ​ — ​ (2,532) ​ Provision for loan losses charged to operations ​ 3,341 ​ ​ 1,587 ​ 264 ​ 5,192 ​ Reduction due to loan removals ​ — ​ ​ — ​ (245) ​ (245) ​ Balance at end of period ​ $ 53,590 ​ $ — ​ $ 4,623 ​ $ 58,213 ​ Six Months Ended June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 43,448 ​ $ — ​ $ 4,627 ​ $ 48,075 ​ Loans charged-off ​ (2,409) ​ ​ (1,517) ​ — ​ (3,926) ​ Recoveries of loans previously charged off (1) ​ 1,853 ​ ​ 252 ​ — ​ 2,105 ​ Net charge-offs ​ (556) ​ ​ (1,265) ​ — ​ (1,821) ​ Provision for losses charged to operations ​ 4,982 ​ ​ 1,265 ​ 685 ​ 6,932 ​ Reduction due to loan removals ​ — ​ ​ — ​ (886) ​ (886) ​ Balance at end of period ​ $ 47,874 ​ $ — ​ $ 4,426 ​ $ 52,300 ​ ​ (1) – Recoveries related to acquired credit impaired loans are recorded through other noninterest income on the consolidated statement of income and do not run through the ALLL. The following tables present a disaggregated analysis of activity in the allowance for loan losses and loan balances for non-acquired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ ​ ​ Other Income ​ ​ ​ ​ ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ Other ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Loans ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, March 31, 2019 ​ $ 5,371 ​ $ 9,740 ​ $ 9,629 ​ $ 12,058 ​ $ 3,273 ​ $ 7,249 ​ $ 1,387 ​ $ 3,195 ​ $ 106 ​ $ 52,008 Charge-offs ​ (9) ​ (3) ​ — ​ (48) ​ — ​ (90) ​ (31) ​ (1,146) ​ — ​ (1,327) Recoveries ​ 326 ​ 23 ​ 41 ​ 30 ​ 98 ​ 138 ​ 13 ​ 206 ​ — ​ 875 Provision (benefit) ​ 30 ​ 551 ​ (144) ​ 392 ​ (194) ​ 198 ​ (10) ​ 1,317 ​ (106) ​ 2,034 Balance, June 30, 2019 ​ $ 5,718 ​ $ 10,311 ​ $ 9,526 ​ $ 12,432 ​ $ 3,177 ​ $ 7,495 ​ $ 1,359 ​ $ 3,572 ​ $ — ​ $ 53,590 Loans individually evaluated for impairment ​ $ 715 ​ $ 1 ​ $ 33 ​ $ 35 ​ $ 125 ​ $ 394 ​ $ 78 ​ $ 3 ​ $ — ​ $ 1,384 Loans collectively evaluated for impairment ​ $ 5,003 ​ $ 10,310 ​ $ 9,493 ​ $ 12,397 ​ $ 3,052 ​ $ 7,101 ​ $ 1,281 ​ $ 3,569 ​ $ — ​ $ 52,206 Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ 36,130 ​ $ 101 ​ $ 5,440 ​ $ 5,566 ​ $ 2,436 ​ $ 2,674 ​ $ 2,064 ​ $ 98 ​ $ — ​ $ 54,509 Loans collectively evaluated for impairment ​ 843,594 ​ 1,723,539 ​ 1,584,547 ​ 2,074,383 ​ 511,806 ​ 1,111,839 ​ 212,139 ​ 503,370 ​ 1,601 ​ 8,566,818 Total non-acquired loans ​ $ 879,724 ​ $ 1,723,640 ​ $ 1,589,987 ​ $ 2,079,949 ​ $ 514,242 ​ $ 1,114,513 ​ $ 214,203 ​ $ 503,468 ​ $ 1,601 ​ $ 8,621,327 Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, March 31, 2018 ​ $ 5,847 ​ $ 6,798 ​ $ 8,346 ​ $ 10,193 ​ $ 3,237 ​ $ 6,333 ​ $ 1,393 ​ $ 2,899 ​ $ 157 ​ $ 45,203 Charge-offs ​ — ​ — ​ (81) ​ — ​ (5) ​ (59) ​ — ​ (1,095) ​ — ​ (1,240) Recoveries ​ 547 ​ 2 ​ 25 ​ 41 ​ 27 ​ 199 ​ 3 ​ 207 ​ — ​ 1,051 Provision (benefit) ​ (207) ​ 409 ​ 317 ​ 711 ​ 109 ​ 238 ​ 17 ​ 1,060 ​ 206 ​ 2,860 Balance, June 30, 2018 ​ $ 6,187 ​ $ 7,209 ​ $ 8,607 ​ $ 10,945 ​ $ 3,368 ​ $ 6,711 ​ $ 1,413 ​ $ 3,071 ​ $ 363 ​ $ 47,874 Loans individually evaluated for impairment ​ $ 846 ​ $ 93 ​ $ 44 ​ $ 30 ​ $ 180 ​ $ 485 ​ $ 144 ​ $ 7 ​ $ — ​ $ 1,829 Loans collectively evaluated for impairment ​ $ 5,341 ​ $ 7,116 ​ $ 8,563 ​ $ 10,915 ​ $ 3,188 ​ $ 6,226 ​ $ 1,269 ​ $ 3,064 ​ $ 363 ​ $ 46,045 Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ 42,392 ​ $ 1,348 ​ $ 4,750 ​ $ 5,628 ​ $ 3,144 ​ $ 1,834 ​ $ 3,240 ​ $ 257 ​ $ — ​ $ 62,593 Loans collectively evaluated for impairment ​ 864,498 ​ 1,133,887 ​ 1,367,703 ​ 1,728,296 ​ 453,802 ​ 939,233 ​ 202,267 ​ 416,393 ​ 28,867 ​ 7,134,946 Total non-acquired loans ​ $ 906,890 ​ $ 1,135,235 ​ $ 1,372,453 ​ $ 1,733,924 ​ $ 456,946 ​ $ 941,067 ​ $ 205,507 ​ $ 416,650 ​ $ 28,867 ​ $ 7,197,539 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ ​ ​ Other Income ​ ​ ​ ​ ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ Other ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Loans ​ Total Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2018 ​ $ 5,682 ​ $ 8,754 ​ $ 9,369 ​ $ 11,913 ​ $ 3,434 ​ $ 7,454 ​ $ 1,446 ​ $ 3,101 ​ $ 41 ​ $ 51,194 Charge-offs ​ (9) ​ (3) ​ (12) ​ (85) ​ (15) ​ (109) ​ (31) ​ (2,308) ​ — ​ (2,572) Recoveries ​ 625 ​ 45 ​ 66 ​ 32 ​ 134 ​ 209 ​ 58 ​ 458 ​ — ​ 1,627 Provision (benefit) ​ (580) ​ 1,515 ​ 103 ​ 572 ​ (376) ​ (59) ​ (114) ​ 2,321 ​ (41) ​ 3,341 Balance, June 30, 2019 ​ $ 5,718 ​ $ 10,311 ​ $ 9,526 ​ $ 12,432 ​ $ 3,177 ​ $ 7,495 ​ $ 1,359 ​ $ 3,572 ​ $ — ​ $ 53,590 Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2017 ​ $ 5,921 ​ $ 6,525 ​ $ 8,128 ​ $ 9,668 ​ $ 3,250 ​ $ 5,488 ​ $ 1,375 ​ $ 2,788 ​ $ 305 ​ $ 43,448 Charge-offs ​ (35) ​ — ​ (81) ​ (4) ​ (71) ​ (144) ​ — ​ (2,074) ​ — ​ (2,409) Recoveries ​ 989 ​ 4 ​ 33 ​ 64 ​ 128 ​ 214 ​ 11 ​ 410 ​ — ​ 1,853 Provision (benefit) ​ (688) ​ 680 ​ 527 ​ 1,217 ​ 61 ​ 1,153 ​ 27 ​ 1,947 ​ 58 ​ 4,982 Balance, June 30, 2018 ​ $ 6,187 ​ $ 7,209 ​ $ 8,607 ​ $ 10,945 ​ $ 3,368 ​ $ 6,711 ​ $ 1,413 ​ $ 3,071 ​ $ 363 ​ $ 47,874 ​ The following tables present a disaggregated analysis of activity in the allowance for loan losses and loan balances for acquired non-credit impaired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ ​ ​ Other Income ​ ​ ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ — ​ — ​ (786) ​ (6) ​ (168) ​ (506) ​ — ​ (69) ​ (1,535) ​ Recoveries ​ 1 ​ — ​ — ​ 3 ​ 24 ​ 6 ​ 71 ​ 11 ​ 116 ​ Provision (benefit) ​ (1) ​ — ​ 786 ​ 3 ​ 144 ​ 500 ​ (71) ​ 58 ​ 1,419 ​ Balance, June 30, 2019 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ 60,391 ​ 595,367 ​ 376,187 ​ 577,284 ​ 208,777 ​ 151,579 ​ 111,006 ​ 99,690 ​ 2,180,281 ​ Total acquired non-credit impaired loans ​ $ 60,391 ​ $ 595,367 ​ $ 376,187 ​ $ 577,284 ​ $ 208,777 ​ $ 151,579 ​ $ 111,006 ​ $ 99,690 ​ $ 2,180,281 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ (106) ​ — ​ (28) ​ — ​ (158) ​ (764) ​ — ​ (127) ​ (1,183) ​ Recoveries ​ 6 ​ — ​ — ​ 5 ​ 28 ​ 2 ​ — ​ 46 ​ 87 ​ Provision (benefit) ​ 100 ​ — ​ 28 ​ (5) ​ 130 ​ 762 ​ — ​ 81 ​ 1,096 ​ Balance, June 30, 2018 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ 281,282 ​ 752,465 ​ 486,254 ​ 676,596 ​ 278,906 ​ 304,864 ​ 169,392 ​ 126,665 ​ 3,076,424 ​ Total acquired non-credit impaired loans ​ $ 281,282 ​ $ 752,465 ​ $ 486,254 ​ $ 676,596 ​ $ 278,906 ​ $ 304,864 ​ $ 169,392 ​ $ 126,665 ​ $ 3,076,424 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ Other Income ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Total Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2018 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ (6) ​ — ​ (786) ​ (6) ​ (240) ​ (640) ​ (26) ​ (205) ​ (1,909) ​ Recoveries ​ 2 ​ — ​ — ​ 5 ​ 46 ​ 171 ​ 71 ​ 27 ​ 322 ​ Provision (benefit) ​ 4 ​ — ​ 786 ​ 1 ​ 194 ​ 469 ​ (45) ​ 178 ​ 1,587 ​ Balance, June 30, 2019 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2017 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ (107) ​ — ​ (28) ​ (70) ​ (240) ​ (807) ​ — ​ (265) ​ (1,517) ​ Recoveries ​ 7 ​ — ​ — ​ 62 ​ 79 ​ 55 ​ — ​ 49 ​ 252 ​ Provision (benefit) ​ 100 ​ — ​ 28 ​ 8 ​ 161 ​ 752 ​ — ​ 216 ​ 1,265 ​ Balance, June 30, 2018 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ The following tables present a disaggregated analysis of activity in the allowance for loan losses and loan balances for acquired credit impaired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real Estate- ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ Construction and ​ Residential ​ ​ ​ ​ Commercial ​ ​ ​ (Dollars in thousands) ​ Real Estate ​ Development ​ Real Estate ​ Consumer ​ and Industrial ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, March 31, 2019 ​ $ 847 ​ $ 717 ​ $ 2,164 ​ $ 707 ​ $ 79 ​ $ 4,514 Provision (benefit) for loan losses ​ 162 ​ 81 ​ 279 ​ (237) ​ (34) ​ 251 Reduction due to loan removals ​ — ​ — ​ (97) ​ — ​ (45) ​ (142) Balance, June 30, 2019 ​ $ 1,009 ​ $ 798 ​ $ 2,346 ​ $ 470 ​ $ — ​ $ 4,623 Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ $ 1,009 ​ $ 798 ​ $ 2,346 ​ $ 470 ​ $ — ​ $ 4,623 Loans:* ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ 164,540 ​ 27,014 ​ 184,208 ​ 38,624 ​ 10,198 ​ 424,584 Total acquired credit impaired loans ​ $ 164,540 ​ $ 27,014 ​ $ 184,208 ​ $ 38,624 ​ $ 10,198 ​ $ 424,584 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance , March 31, 2018 ​ $ 261 ​ $ 215 ​ $ 2,509 ​ $ 594 ​ $ 505 ​ $ 4,084 Provision (benefit) for loan losses ​ 375 ​ 390 ​ 137 ​ (19) ​ (361) ​ 522 Reduction due to loan removals ​ — ​ (29) ​ (132) ​ (3) ​ (16) ​ (180) Balance, June 30, 2018 ​ $ 636 ​ $ 576 ​ $ 2,514 ​ $ 572 ​ $ 128 ​ $ 4,426 Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ $ 636 ​ $ 576 ​ $ 2,514 ​ $ 572 ​ $ 128 ​ $ 4,426 Loans:* ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ 227,739 ​ 40,951 ​ 229,502 ​ 45,633 ​ 12,580 ​ 556,405 Total acquired credit impaired loans ​ $ 227,739 ​ $ 40,951 ​ $ 229,502 ​ $ 45,633 ​ $ 12,580 ​ $ 556,405 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real Estate- ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ Construction and ​ Residential ​ ​ ​ ​ Commercial ​ ​ ​ (Dollars in thousands) ​ Real Estate ​ Development ​ Real Estate ​ Consumer ​ and Industrial ​ Total Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2018 ​ $ 801 ​ $ 717 ​ $ 2,246 ​ $ 761 ​ $ 79 ​ $ 4,604 Provision (benefit) for loan losses ​ 213 ​ 81 ​ 295 ​ (291) ​ (34) ​ 264 Reduction due to loan removals ​ (5) ​ — ​ (195) ​ — ​ (45) ​ (245) Balance, June 30, 2019 ​ $ 1,009 ​ $ 798 ​ $ 2,346 ​ $ 470 ​ $ — ​ $ 4,623 Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2017 ​ $ 288 ​ $ 180 ​ $ 3,553 ​ $ 461 ​ $ 145 ​ $ 4,627 Provision (benefit) for loan losses ​ 361 ​ 478 ​ (807) ​ 114 ​ 539 ​ 685 Reduction due to loan removals ​ (13) ​ (82) ​ (232) ​ (3) ​ (556) ​ (886) Balance, June 30, 2018 ​ $ 636 ​ $ 576 ​ $ 2,514 ​ $ 572 ​ $ 128 ​ $ 4,426 ​ ​ *— The carrying value of acquired credit impaired loans includes a non-accretable difference which is primarily associated with the assessment of credit quality of acquired loans. ​ As part of the ongoing monitoring of the credit quality of our loan portfolio, management tracks certain credit quality indicators, including trends related to (i) the level of classified loans, (ii) net charge-offs, (iii) non-performing loans (see details below), and (iv) the general economic conditions of the markets that we serve. ​ ​ ● Pass—These loans range from minimal credit risk to average, however, still acceptable credit risk. ● Special mention—A special mention loan has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or the institution’s credit position at some future date. ● Substandard—A substandard loan is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified must have a well-defined weakness, or weaknesses, that may jeopardize the liquidation of the debt. A substandard loan is characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. ● Doubtful—A doubtful loan has all of the weaknesses inherent in one classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of the currently existing facts, conditions and values, highly questionable and improbable. ​ The following table presents the credit risk profile by risk grade of commercial loans for non-acquired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction & Development ​ Commercial Non-owner Occupied ​ Commercial Owner Occupied ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 871,393 ​ $ 832,612 ​ $ 895,887 ​ $ 1,714,606 ​ $ 1,407,744 ​ $ 1,126,099 ​ $ 1,561,594 ​ $ 1,480,267 ​ $ 1,343,624 ​ Special mention ​ 5,948 ​ 6,015 ​ 7,858 ​ 7,557 ​ 6,427 ​ 7,378 ​ 16,310 ​ 24,576 ​ 18,808 ​ Substandard ​ 2,383 ​ 2,818 ​ 3,145 ​ 1,477 ​ 1,380 ​ 1,758 ​ 12,083 ​ 12,708 ​ 10,021 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 879,724 ​ $ 841,445 ​ $ 906,890 ​ $ 1,723,640 ​ $ 1,415,551 ​ $ 1,135,235 ​ $ 1,589,987 ​ $ 1,517,551 ​ $ 1,372,453 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial & Industrial ​ Other Income Producing Property ​ Commercial Total ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 1,090,519 ​ $ 1,037,915 ​ $ 923,995 ​ $ 208,598 ​ $ 208,186 ​ $ 198,899 ​ $ 5,446,710 ​ $ 4,966,724 ​ $ 4,488,504 ​ Special mention ​ 16,279 ​ 5,887 ​ 8,522 ​ 4,376 ​ 4,706 ​ 4,828 ​ 50,470 ​ 47,611 ​ 47,394 ​ Substandard ​ 7,715 ​ 11,150 ​ 8,550 ​ 1,229 ​ 1,461 ​ 1,780 ​ 24,887 ​ 29,517 ​ 25,254 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 1,114,513 ​ $ 1,054,952 ​ $ 941,067 ​ $ 214,203 ​ $ 214,353 ​ $ 205,507 ​ $ 5,522,067 ​ $ 5,043,852 ​ $ 4,561,152 ​ ​ The following table presents the credit risk profile by risk grade of consumer loans for non-acquired loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer Owner Occupied ​ Home Equity ​ Consumer ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 2,052,808 ​ $ 1,909,427 ​ $ 1,706,574 ​ $ 502,305 ​ $ 481,607 ​ $ 443,953 ​ $ 501,474 ​ $ 446,823 ​ $ 415,053 ​ Special mention ​ 9,936 ​ 11,304 ​ 12,566 ​ 5,731 ​ 7,293 ​ 6,805 ​ 443 ​ 437 ​ 623 ​ Substandard ​ 17,205 ​ 15,534 ​ 14,784 ​ 6,206 ​ 6,248 ​

Other Real Estate Owned

Other Real Estate Owned	6 Months Ended
	Jun. 30, 2019
Other Real Estate Owned
Other Real Estate Owned	Note 6—Other Real Estate Owned ​ The following is a summary of information pertaining to OREO: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, ​ (Dollars in thousands) ​ 2019 ​ 2018 ​ Beginning balance ​ $ 11,410 ​ $ 11,203 ​ Acquired in PSC acquisition ​ — ​ 210 ​ Additions ​ 7,632 ​ 10,259 ​ Writedowns ​ (487) ​ (932) ​ Sold ​ (4,049) ​ (3,518) ​ Ending Balance ​ $ 14,506 ​ $ 17,222 ​ ​ At June 30, 2019, there were a total of 69 properties included in OREO compared to 86 properties at June 30, 2018. At June 30, 2019, we had $2.5 million in residential real estate included in OREO and $6.3 million in residential real estate consumer mortgage loans in the process of foreclosure.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases
Leases	Note 7 — Leases ​ As of June 30, 2019, we had operating ROU assets of $84.5 million and operating lease liabilities of $85.0 million. We maintain operating leases on land and buildings for our operating centers, branch facilities and ATM locations. Most leases include one or more Factors in determining whether an option is reasonably certain of exercise include, but are not limited to, the value of leasehold improvements, the value of renewal rate compared to market rates, and the presence of factors that would cause a significant economic penalty to us if the option is not exercised. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ (Dollars in thousands) ​ June 30, ​ June 30, ​ ​ 2019 2019 Lease Expense Components: ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease expense ​ $ 2,173 ​ ​ $ 4,319 ​ ​ Short-term lease expense ​ ​ 132 ​ ​ ​ 276 ​ ​ Variable lease expense ​ 117 ​ ​ 186 ​ ​ Total lease expense ​ $ 2,422 ​ ​ $ 4,781 ​ ​ Supplemental Cash Flow and Other Information Related to Leases: ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for amounts included in the measurement of lease liabilities - operating leases ​ $ 1,918 ​ ​ $ 3,808 ​ ​ Initial ROU assets recorded in exchange for new lease liabilities - operating leases ​ $ 2,994 ​ ​ $ 4,950 ​ ​ Weighted - average remaining lease term (years) - operating leases ​ ​ ​ ​ ​ 14.40 ​ ​ Weighted - average discount rate - operating leases ​ ​ ​ ​ 4.0% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ ​ ​ ​ ​ ​ ​ 2019 ​ Supplemental Balance Sheet Information Related to Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease ROU assets (premises and equipment) ​ ​ ​ ​ ​ $ 84,464 ​ ​ Operating lease liabilities (other liabilities) ​ ​ ​ ​ ​ $ 84,968 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Maturity Analysis of Lease Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ending December 31, ​ ​ ​ ​ ​ ​ ​ ​ ​ 2019 (excluding the six months ended June 30, 2019) ​ ​ ​ ​ ​ $ 3,796 ​ ​ 2020 ​ ​ ​ ​ ​ ​ 7,531 ​ ​ 2021 ​ ​ ​ ​ ​ ​ 7,989 ​ ​ 2022 ​ ​ ​ ​ ​ ​ 8,007 ​ ​ 2023 ​ ​ ​ ​ ​ ​ 8,021 ​ ​ Thereafter ​ ​ ​ ​ ​ ​ 78,176 ​ ​ Total ​ ​ ​ ​ ​ ​ 113,520 ​ ​ Less: Imputed Interest ​ ​ ​ ​ ​ ​ (28,552) ​ ​ Lease Liability ​ ​ ​ ​ ​ $ 84,968 ​ ​ ​ ​ years. Disclosures for prior periods under the previous accounting guidance were on an annual basis only, therefore are not included for the June 30, 2019 interim reporting period.

Deposits

Deposits	6 Months Ended
	Jun. 30, 2019
Deposits
Deposits	Note 8 — Deposits ​ Our total deposits are comprised of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 Certificates of deposit ​ $ 1,732,554 ​ $ 1,775,095 ​ $ 1,804,657 Interest-bearing demand deposits ​ 5,588,061 ​ 5,407,175 ​ 5,216,942 Non-interest bearing demand deposits ​ 3,255,906 ​ 3,061,769 ​ 3,152,828 Savings deposits ​ 1,339,293 ​ 1,399,815 ​ 1,458,208 Other time deposits ​ 6,466 ​ 3,079 ​ 5,654 Total deposits ​ $ 11,922,280 ​ $ 11,646,933 ​ $ 11,638,289 ​ At June 30, 2019, December 31, 2018, and June 30, 2018, we had $310.2 million, $320.0 million, and $336.9 million in certificates of deposits of $250,000 and greater, respectively. At June 30, 2019, December 31, 2018, and June 30, 2018, we had $3.9 million, $7.6 million and $19.8 million, in traditional, out-of-market brokered deposits, respectively.

Retirement Plans

Retirement Plans	6 Months Ended
	Jun. 30, 2019
Retirement Plans
Retirement Plans	Note 9 — Retirement Plans ​ The Company and the Bank provide certain retirement benefits to their employees in the form of a non-contributory defined benefit pension plan and an employees’ savings plan. The non-contributory defined benefit pension plan covers all employees hired on or before December 31, 2005, who have attained age 21 , and who have completed a year of eligible service. Employees hired on or after January 1, 2006 are not eligible to participate in the non-contributory defined benefit pension plan, but are eligible to participate in the employees’ savings plan. On this date, a new benefit formula applies only to participants who have not attained age 45 or who do not have five years of service. ​ Effective July 1, 2009, we suspended the accrual of benefits for pension plan participants under the non-contributory defined benefit plan. The pension plan remained suspended as of June 30, 2019. ​ During 2018, we made the decision to terminate the non-contributory defined benefit pension plan. We received approval from the IRS through a determination letter in the fourth quarter of 2018 to proceed with the termination. The termination of the pension plan was recorded during the second quarter of 2019 and distributions of assets from the plan will be fully paid out by the third quarter of 2019. During the second quarter of 2019, the Company recorded a charge of $9.5 million related to the termination of the pension plan in the consolidated statement of income. This cost was the result of the recognition of the pre-tax losses from the pension plan that were recorded and held in accumulated other comprehensive income of $7.7 and the write-off of the pension plan asset of $1.8 million. Participants have the option to be fully paid out in a lump sum or be paid through an annuity over time. If the participant chooses the annuity, the funds will be placed in an annuity product with a third party. ​ Under the provisions of Internal Revenue Code Section 401(k), electing employees are eligible to participate in the employees’ savings plan after attaining age 21 . Plan participants elect to contribute portions of their annual base compensation as a before tax contribution. Employer contributions may be made from current or accumulated net profits. Participants may elect to contribute 1% to 50% of annual base compensation as a before tax contribution. In 2018, employees participating in the plan received a 100% match of their 401(k) plan contribution from the Company, up to 4 % of their salary. The employees were also eligible for an additional 2 % discretionary matching contribution contingent upon certain of our annual financial goals which would be paid in the first quarter of the following year. Based on our financial performance in 2018, we paid a 0.75 % discretionary matching contribution in the first quarter of 2019. Currently, we expect the same terms in the employees’ savings plan for 2019. We expensed $1.7 million and $3.0 ​ Employees can enter the savings plan on or after the first day of each month. The employee may enter into a salary deferral agreement at any time to select an alternative deferral amount or to elect not to defer in the plan. If the employee does not elect an investment allocation, the plan administrator will select a retirement-based portfolio according to the employee’s number of years until normal retirement age. The plan’s investment valuations are generally provided on a daily basis.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share
Earnings Per Share	Note 10 — Earnings Per Share ​ Basic earnings per share are calculated by dividing net income by the weighted-average shares of common stock outstanding during each period, excluding non-vested shares. Our diluted earnings per share are based on the weighted-average shares of common stock outstanding during each period plus the maximum dilutive effect of common stock issuable upon exercise of stock options or vesting of restricted shares. The weighted-average number of shares and equivalents are determined after giving retroactive effect to stock dividends and stock splits. ​ The following table sets forth the computation of basic and diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ June 30, ​ June 30, ​ (Dollars and shares in thousands, except for per share amounts) 2019 2018 2019 2018 Basic earnings per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 41,460 ​ $ 40,459 ​ $ 85,827 ​ $ 82,785 ​ Weighted-average basic common shares ​ ​ 35,089 ​ ​ 36,677 ​ ​ 35,268 ​ ​ 36,657 ​ Basic earnings per common share ​ $ 1.18 ​ $ 1.10 ​ $ 2.43 ​ $ 2.25 ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 41,460 ​ $ 40,459 ​ $ 85,827 ​ $ 82,785 ​ Weighted-average basic common shares ​ ​ 35,089 ​ ​ 36,677 ​ ​ 35,268 ​ ​ 36,657 ​ Effect of dilutive securities ​ ​ 211 ​ ​ 252 ​ ​ 193 ​ ​ 253 ​ Weighted-average dilutive shares ​ ​ 35,300 ​ ​ 36,929 ​ ​ 35,461 ​ ​ 36,910 ​ Diluted earnings per common share ​ $ 1.17 ​ $ 1.09 ​ $ 2.42 ​ $ 2.24 ​ ​ The calculation of diluted earnings per common share excludes outstanding stock options for which the results would have been anti-dilutive under the treasury stock method as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ (Dollars in thousands) 2019 2018 2019 2018 Number of shares ​ ​ ​ ​ ​ 63,313 ​ ​ ​ ​ ​ 61,272 ​ ​ ​ ​ 63,313 ​ ​ ​ ​ ​ 61,272 ​ Range of exercise prices ​ $ 69.48 to $ 91.35 ​ $ 91.05 to $ 91.35 ​ $ 69.48 to $ 91.35 ​ $ 91.05 to $ 91.35 ​ ​

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2019
Share-Based Compensation
Share-Based Compensation	Note 11 — Share-Based Compensation ​ Our 2004, 2012 and 2019 share-based compensation plans are long-term retention plans intended to attract, retain, and provide incentives for key employees and non-employee directors in the form of incentive and non-qualified stock options, restricted stock, and restricted stock units (“RSUs”). ​ Stock Options ​ With the exception of non-qualified stock options granted to directors under the 2004 and 2012 plans, which in some cases may be exercised at any time prior to expiration and in some other cases may be exercised at intervals less than a year following the grant date, incentive stock options granted under our 2004, 2012 and 2019 plans may not be exercised in whole or in part within a year following the date of the grant, as these incentive stock options become exercisable in 25% increments pro ratably over the four-year period following the grant date. The options are granted at an exercise price at least equal to the fair value of the common stock at the date of grant and expire ten years from the date of grant. No options were granted under the 2004 plan after January 26, 2012, and the 2004 plan is closed other than for any options still unexercised and outstanding. No options were granted under the 2012 plan after February 1, 2019, and the 2012 plan is closed other than for any options still unexercised and outstanding. The 2019 plan is the only plan from which new share-based compensation grants may be issued. It is our policy to grant options out of the 1,000,000 share registered under the 2019 plan. ​ Activity in our stock option plans for 2004 and 2012 is summarized in the following table. Our 2019 plan was adopted by our shareholders at our annual meeting on April 25, 2019. All information has been retroactively adjusted for stock dividends and stock splits. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ Weighted ​ Average ​ Aggregate ​ ​ ​ ​ ​ Average ​ Remaining ​ Intrinsic ​ ​ Shares Price (Yrs.) (000's) Outstanding at January 1, 2019 ​ 213,866 ​ $ 61.28 ​ ​ ​ ​ ​ ​ Granted ​ — ​ — ​ ​ ​ ​ ​ Exercised ​ (12,722) ​ 31.62 ​ ​ ​ ​ ​ Outstanding at June 30, 2019 ​ 201,144 ​ 63.16 ​ 5.39 ​ $ 3,201 ​ Exercisable at June 30, 2019 ​ 155,472 ​ ​ 56.07 ​ 4.63 ​ $ 3,137 ​ Weighted-average fair value of options granted during the year ​ $0.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The fair value of options is estimated at the date of grant using the Black-Scholes option pricing model and expensed over the options’ vesting periods. The following weighted-average assumptions were used in valuing options issued (There have been no stock options issued in 2019): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six months ended June 30, ​ 2019 2018 Dividend yield ​ — % ​ 1.46 % Expected life — years ​ 8.5 years Expected volatility — % 28.0 % Risk-free interest rate — % 2.54 % ​ As of June 30, 2019, there was $1.0 million of total unrecognized compensation cost related to nonvested stock option grants under the plans. The cost is expected to be recognized over a weighted-average period of 1.26 years as of June 30, 2019. The total fair value of shares vested during the six months ended June 30, 2019 was $799,000. ​ Restricted Stock ​ We from time-to-time also grants shares of restricted stock to key employees and non-employee directors. These awards help align the interests of these employees and directors with the interests of our shareholders by providing economic value directly related to increases in the value of our stock. The value of the stock awarded is established as the fair market value of the stock at the time of the grant. We recognize expenses, equal to the total value of such awards, ratably over the vesting period of the stock grants. Restricted stock grants to employees typically “cliff vest” after four years . Grants to non-employee directors typically vest within a 12-month period. ​ All restricted stock agreements are conditioned upon continued employment and service in the case of directors. Termination of employment prior to a vesting date, as described below, would terminate any interest in non-vested shares. Prior to vesting of the shares, as long as employed by the Company, the key employees and non-employee directors will have the right to vote such shares and to receive dividends paid with respect to such shares. All restricted shares will fully vest in the event of change in control of the Company or upon the death of the recipient. ​ Nonvested restricted stock for the six months ended June 30, 2019 is summarized in the following table. All information has been retroactively adjusted for stock dividends and stock splits. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted- ​ ​ ​ ​ Average ​ ​ ​ ​ Grant-Date Restricted Stock ​ Shares ​ Fair Value Nonvested at January 1, 2019 104,419 ​ $ 62.45 ​ Granted 8,934 ​ 73.34 ​ Vested (26,514) ​ 74.29 ​ Forfeited (2,332) ​ 73.89 ​ Nonvested at June 30, 2019 84,507 ​ 59.57 ​ ​ As of June 30, 2019, there was $2.0 million of total unrecognized compensation cost related to nonvested restricted stock granted under the plans. This cost is expected to be recognized over a weighted-average period of 30, 2019. The total fair value of shares vested during the six months ended June 30, 2019 was ​ Restricted Stock Units ​ We from time-to-time also grants performance RSUs to key employees. These awards help align the interests of these employees with the interests of our shareholders by providing economic value directly related to our performance. Some performance RSU grants contain a three-year performance period while others contain a one-year performance period and a time vested requirement (generally four years from grant date). We communicate threshold, target, and maximum performance RSU awards and performance targets to the applicable key employees at the beginning of a performance period. Dividends are not paid in respect to the awards during the performance period. The value of the RSUs awarded is established as the fair market value of the stock at the time of the grant. We recognize expenses on a straight-line basis typically over the performance and vesting periods based upon the probable performance target that will be met. For the six months ended June 30, 2019, we accrued for 88.1% of the RSUs granted, based on Management’s expectations of performance. Nonvested RSUs for the six months ended June 30, 2019 is summarized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted- ​ ​ ​ ​ Average ​ ​ ​ ​ Grant-Date Restricted Stock Units ​ Shares ​ Fair Value Nonvested at January 1, 2019 200,540 ​ $ 85.10 ​ Granted 152,564 ​ 67.83 ​ Forfeited ​ (1,651) ​ ​ 89.43 ​ Nonvested at June 30, 2019 351,453 ​ 77.58 ​ ​ As of June 30, 2019, there was $13.4 million of total unrecognized compensation cost related to nonvested RSUs granted under the plan. This cost is expected to be recognized over a weighted-average period of years as of June 30, 2019. The total fair value of RSUs vested during the six months ended June 30, 2019 was million. During the six months ended June 30, 2019,

Commitments and Contingent Liab

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2019
Commitments and Contingent Liabilities
Commitments and Contingent Liabilities	Note 12 — Commitments and Contingent Liabilities ​ In the normal course of business, we make various commitments and incur certain contingent liabilities, which are not reflected in the accompanying financial statements. The commitments and contingent liabilities include guarantees, commitments to extend credit, and standby letters of credit. At June 30, 2019, commitments to extend credit and standby letters of credit totaled $2.8 billion. We do not anticipate any material losses as a result of these transactions. ​ We have been named as defendant in various legal actions, arising from its normal business activities, in which damages in various amounts are claimed. We are also exposed to litigation risk related to the prior business activities of banks acquired through whole bank acquisitions as well as banks from which assets were acquired and liabilities assumed in FDIC-assisted transactions. Although the amount of any ultimate liability with respect to such matters cannot be determined, in the opinion of management, any such liability is not expected to have a material effect on our consolidated financial statements. The Company and the Bank are involved at times in certain litigation arising in the normal course of business. In the opinion of management as of June 30, 2019, there is no pending or threatened litigation that will have a material effect on our consolidated financial position or results of operations.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2019
Fair Value
Fair Value	Note 13 — Fair Value ​ FASB ASC Topic 820, Fair Value Measurements and Disclosures ​ We utilize fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Available for sale securities, derivative contracts, and mortgage servicing rights (“MSRs”) are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record at fair value other assets on a nonrecurring basis, such as impaired loans, OREO, and certain other assets. These nonrecurring fair value adjustments typically involve application of lower of cost or market accounting or write-downs of individual assets. ​ FASB ASC Topic 820 establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows: ​ Level 1 Observable inputs such as quoted prices in active markets; Level 2 Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and Level 3 Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. ​ The following is a description of valuation methodologies used for assets recorded at fair value. ​ Investment Securities ​ Securities available for sale are valued on a recurring basis at quoted market prices where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable securities. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange and The NASDAQ Stock Market, or U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and money market funds. Level 2 securities include mortgage-backed securities and debentures issued by government sponsored entities, municipal bonds and corporate debt securities. Securities held to maturity are valued at quoted market prices or dealer quotes similar to securities available for sale. The carrying value of FHLB stock approximates fair value based on the redemption provisions. ​ Mortgage Loans Held for Sale ​ Mortgage loans held for sale are carried at fair value. The fair values of mortgage loans held for sale are based on commitments on hand from investors within the secondary market for loans with similar characteristics. As such, the fair value adjustments for mortgage loans held for sale are recurring Level 2. ​ Loans ​ We do not record loans at fair value on a recurring basis. However, from time to time, a loan may be considered impaired and an ALLL may be established. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment using estimated fair value methodologies. The fair value of impaired loans is estimated using one of several methods, including collateral value, market value of similar debt, enterprise value, liquidation value and discounted cash flows. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. At June 30, 2019, substantially all of the impaired loans were evaluated based on the fair value of the collateral because such loans were considered collateral dependent. Impaired loans, where an allowance is established based on the fair value of collateral; require classification in the fair value hierarchy. When the fair value of the collateral is based on an observable market price or a current appraised value, we consider the impaired loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, we consider the impaired loan as nonrecurring Level 3. ​ Other Real Estate Owned ​ Typically OREO, consisting of properties obtained through foreclosure or in satisfaction of loans, is reported at fair value, determined on the basis of current appraisals, comparable sales, and other estimates of value obtained principally from independent sources, adjusted for estimated selling costs (Level 2). However, OREO is considered Level 3 in the fair value hierarchy because management has qualitatively applied a discount due to the size, supply of inventory, and the incremental discounts applied to the appraisals. Management also considers other factors, including changes in absorption rates, length of time the property has been on the market and anticipated sales values, which have resulted in adjustments to the collateral value estimates indicated in certain appraisals. At the time of foreclosure, any excess of the loan balance over the fair value of the real estate held as collateral is treated as a charge against the ALLL. Gains or losses on sale and generally any subsequent adjustments to the value are recorded as a component of OREO expense. ​ Derivative Financial Instruments ​ Fair value is estimated using pricing models of derivatives with similar characteristics or discounted cash flow models where future floating cash flows are projected and discounted back; and accordingly, these derivatives are classified within Level 2 of the fair value hierarchy. (See Note 15—Derivative Financial Instruments for additional information). ​ Mortgage servicing rights ​ The estimated fair value of MSRs is obtained through an independent derivatives dealer analysis of future cash flows. The evaluation utilizes assumptions market participants would use in determining fair value including market discount rates, prepayment speeds, servicing income, servicing costs, default rates and other market driven data, as well as the market’s perception of future interest rate movements. MSRs are classified as Level 3. ​ Assets and Liabilities Recorded at Fair Value on a Recurring Basis ​ The tables below present the recorded amount of assets and liabilities measured at fair value on a recurring basis. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs (Dollars in thousands) ​ Fair Value ​ (Level 1) ​ (Level 2) ​ (Level 3) June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 17,587 ​ $ — ​ $ 17,587 ​ $ — Loans held for sale ​ 47,796 ​ — ​ 47,796 ​ — Securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ ​ 66,529 ​ ​ — ​ ​ 66,529 ​ ​ — State and municipal obligations ​ 182,146 ​ — ​ 182,146 ​ — Mortgage-backed securities ​ 1,468,601 ​ — ​ 1,468,601 ​ — Total securities available for sale ​ 1,717,276 ​ — ​ 1,717,276 ​ — Mortgage servicing rights ​ 30,332 ​ — ​ — ​ 30,332 ​ ​ $ 1,812,991 ​ $ — ​ $ 1,782,659 ​ $ 30,332 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 30,286 ​ $ — ​ $ 30,286 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 5,090 ​ $ — ​ $ 5,090 ​ $ — Loans held for sale ​ 22,925 ​ — ​ 22,925 ​ — Securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ ​ 48,251 ​ ​ — ​ ​ 48,251 ​ ​ — State and municipal obligations ​ 200,768 ​ — ​ 200,768 ​ — Mortgage-backed securities ​ 1,268,048 ​ — ​ 1,268,048 ​ — Total securities available for sale ​ 1,517,067 ​ — ​ 1,517,067 ​ — Mortgage servicing rights ​ 34,727 ​ — ​ — ​ 34,727 ​ ​ $ 1,579,809 ​ $ — ​ $ 1,545,082 ​ $ 34,727 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 4,421 ​ $ — ​ $ 4,421 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 8,848 ​ $ — ​ $ 8,848 ​ $ — Loans held for sale ​ 36,968 ​ — ​ 36,968 ​ — Securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ ​ 47,613 ​ ​ — ​ ​ 47,613 ​ ​ — State and municipal obligations ​ 223,816 ​ — ​ 223,816 ​ — Mortgage-backed securities ​ 1,306,570 ​ — ​ 1,306,570 ​ — Total securities available for sale ​ 1,577,999 ​ — ​ 1,577,999 ​ — Mortgage servicing rights ​ 35,107 ​ — ​ — ​ 35,107 ​ ​ $ 1,658,922 ​ $ — ​ $ 1,623,815 ​ $ 35,107 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 8,097 ​ $ — ​ $ 8,097 ​ $ — ​ Changes in Level 1, 2 and 3 Fair Value Measurements ​ When a determination is made to classify a financial instrument within Level 3 of the valuation hierarchy, the determination is based upon the significance of the unobservable factors to the overall fair value measurement. However, since Level 3 financial instruments typically include, in addition to the unobservable or Level 3 components, observable components (that is, components that are actively quoted and can be validated to external sources), the gains and losses below include changes in fair value due in part to observable factors that are part of the valuation methodology. ​ There were no changes in hierarchy classifications of Level 3 assets or liabilities for the six months ended June 30, 2019. A reconciliation of the beginning and ending balances of Level 3 assets and liabilities recorded at fair value on a recurring basis for the six months ended June 30, 2019 and 2018 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) Assets Liabilities Fair value, January 1, 2019 ​ $ 34,727 ​ $ — ​ Servicing assets that resulted from transfers of financial assets ​ 2,558 ​ — ​ Changes in fair value due to valuation inputs or assumptions ​ (4,924) ​ — ​ Changes in fair value due to decay ​ (2,029) ​ — ​ Fair value , June 30, 2019 ​ $ 30,332 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value, January 1, 2018 ​ $ 31,119 ​ $ — ​ Servicing assets that resulted from transfers of financial assets ​ 3,112 ​ — ​ Changes in fair value due to valuation inputs or assumptions ​ ​ 2,945 ​ ​ — ​ Changes in fair value due to decay ​ (2,069) ​ — ​ Fair value, June 30, 2018 ​ $ 35,107 ​ $ — ​ ​ There were no unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities at June 30, 2019 or 2018. ​ Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis ​ The tables below present the recorded amount of assets and liabilities measured at fair value on a nonrecurring basis: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs (Dollars in thousands) ​ Fair Value ​ (Level 1) ​ (Level 2) ​ (Level 3) June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OREO ​ $ 14,506 ​ $ — ​ $ — ​ $ 14,506 ​ Non-acquired impaired loans ​ 4,946 ​ — ​ — ​ 4,946 ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OREO ​ $ 11,410 ​ $ — ​ $ — ​ $ 11,410 ​ Non-acquired impaired loans ​ 13,164 ​ — ​ — ​ 13,164 ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OREO ​ $ 17,222 ​ $ — ​ $ — ​ $ 17,222 ​ Non-acquired impaired loans ​ 5,909 ​ — ​ — ​ 5,909 ​ ​ ​ Quantitative Information about Level 3 Fair Value Measurement ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Average ​ ​ ​ ​ ​ ​ June 30, ​ December 31, June 30, ​ ​ Valuation Technique Unobservable Input 2019 2018 2018 Nonrecurring measurements: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-acquired impaired loans Discounted appraisals Collateral discounts ​ 3 % ​ 3 % 3 % OREO Discounted appraisals Collateral discounts and estimated costs to sell ​ 22 % ​ 23 % 17 % ​ Fair Value of Financial Instruments ​ We used the following methods and assumptions in estimating our fair value disclosures for financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those models are significantly affected by the assumptions used, including the discount rates and estimates of future cash flows. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instrument. The use of different methodologies may have a material effect on the estimated fair value amounts. The fair value estimates presented herein are based on pertinent information available to management as of June 30, 2019, December 31, 2018 and June 30, 2018. Such amounts have not been revalued for purposes of these consolidated financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein. ​ The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value: ​ Cash and Cash Equivalents ​ Investment Securities — Securities held to maturity are valued at quoted market prices or dealer quotes. The carrying value of FHLB stock approximates fair value based on the redemption provisions. The carrying value of our investment in unconsolidated subsidiaries approximates fair value. See Note 4—Investment Securities for additional information, as well as page 40 regarding fair value. ​ Loans held for sale ​ Loans — ASU 2016-01 - Financial Instruments – Overall – Recognition and Measurement of Financial Assets and Financial Liabilities became effective for us on January 1, 2018. This accounting standard requires us to calculate the fair value of our loans for disclosure purposes based on an estimated exit price. With ASU 2016-01, to estimate an exit price, all loans (fixed and variable) are being valued with a discounted cash flow analyses for loans that includes our estimate of future credit losses expected to be incurred over the life of the loans. Fair values for certain mortgage loans (e.g., one-to-four family residential) and other consumer loans are estimated using discounted cash flow analyses based on our current rates offered for new loans of the same type, structure and credit quality. Fair values for other loans (e.g., commercial real estate and investment property mortgage loans, commercial and industrial loans) are estimated using discounted cash flow analyses-using interest rates we currently offer for loans with similar terms to borrowers of similar credit quality. Fair values for non-performing loans are estimated using a discounted cash flow analyses. ​ Deposit Liabilities ​ Federal Funds Purchased and Securities Sold Under Agreements to Repurchase ​ Other Borrowings ​ Accrued Interest ​ Derivative Financial Instruments ​ Commitments to Extend Credit, Standby Letters of Credit and Financial Guarantees ​ The estimated fair value, and related carrying amount, of our financial instruments are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying Fair ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ Amount ​ Value ​ Level 1 ​ Level 2 ​ Level 3 June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 851,971 ​ $ 851,971 ​ $ 851,971 ​ $ — ​ $ — ​ Investment securities ​ 1,766,400 ​ 1,766,400 ​ 49,124 ​ 1,717,276 ​ — ​ Loans held for sale ​ ​ 47,796 ​ ​ 47,796 ​ ​ — ​ ​ 47,796 ​ ​ — ​ Loans, net of allowance for loan losses ​ 11,167,979 ​ 11,278,624 ​ — ​ — ​ 11,278,624 ​ Accrued interest receivable ​ 38,650 ​ 38,650 ​ — ​ 7,880 ​ 30,770 ​ Mortgage servicing rights ​ 30,332 ​ 30,332 ​ — ​ — ​ 30,332 ​ Interest rate swap - non-designated hedge ​ 14,561 ​ 14,561 ​ — ​ 14,561 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ 3,026 ​ 3,026 ​ — ​ 3,026 ​ — ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 11,922,280 ​ 11,124,796 ​ — ​ 11,124,796 ​ — ​ Federal funds purchased and securities sold under agreements to repurchase ​ 298,029 ​ 298,029 ​ — ​ 298,029 ​ — ​ Other borrowings ​ 816,414 ​ 819,306 ​ — ​ 819,306 ​ — ​ Accrued interest payable ​ 6,168 ​ 6,168 ​ — ​ 6,168 ​ — ​ Interest rate swap - non-designated hedge ​ 15,952 ​ 15,952 ​ — ​ 15,952 ​ — ​ Interest rate swap - cash flow hedge ​ 14,334 ​ 14,334 ​ — ​ 14,334 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ — ​ — ​ — ​ — ​ — ​ Off balance sheet financial instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to extend credit ​ — ​ 27,579 ​ — ​ 27,579 ​ — ​ December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 408,983 ​ $ 408,983 ​ $ 408,983 ​ $ — ​ $ — ​ Investment securities ​ 1,542,671 ​ 1,542,671 ​ 25,604 ​ 1,517,067 ​ — ​ Loans held for sale ​ ​ 22,925 ​ ​ 22,925 ​ ​ — ​ ​ 22,925 ​ ​ — ​ Loans, net of allowance for loan losses ​ 10,962,037 ​ 10,613,571 ​ — ​ — ​ 10,613,571 ​ Accrued interest receivable ​ 35,997 ​ 35,997 ​ — ​ 6,908 ​ 29,089 ​ Mortgage servicing rights ​ 34,727 ​ 34,727 ​ — ​ — ​ 34,727 ​ Interest rate swap - non-designated hedge ​ 3,824 ​ 3,824 ​ — ​ 3,824 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ 1,267 ​ 1,267 ​ — ​ 1,267 ​ — ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 11,646,933 ​ 10,561,394 ​ — ​ 10,561,394 ​ — ​ Federal funds purchased and securities sold under agreements to repurchase ​ 270,649 ​ 270,649 ​ — ​ 270,649 ​ — ​ Other borrowings ​ 266,084 ​ 269,134 ​ — ​ 269,134 ​ — ​ Accrued interest payable ​ 4,719 ​ 4,719 ​ — ​ 4,719 ​ — ​ Interest rate swap - non-designated hedge ​ 4,373 ​ 4,373 ​ — ​ 4,373 ​ — ​ Interest rate swap - cash flow hedge ​ 48 ​ 48 ​ — ​ 48 ​ — ​ Off balance sheet financial instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to extend credit ​ ​ — ​ (88,424) ​ — ​ (88,424) ​ — ​ June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 396,849 ​ $ 396,849 ​ $ 396,849 ​ $ — ​ $ — ​ Investment securities ​ 1,597,727 ​ 1,597,731 ​ 19,229 ​ 1,578,502 ​ — ​ Loans held for sale ​ ​ 36,968 ​ ​ 36,968 ​ ​ — ​ ​ 36,968 ​ ​ — ​ Loans, net of allowance for loan losses ​ 10,778,068 ​ 10,547,778 ​ — ​ — ​ 10,547,778 ​ Accrued interest receivable ​ 33,751 ​ 33,751 ​ — ​ 7,333 ​ 26,418 ​ Mortgage servicing rights ​ 35,107 ​ 35,107 ​ — ​ — ​ 35,107 ​ Interest rate swap - non-designated hedge ​ 7,750 ​ 7,750 ​ — ​ 7,750 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ 1,098 ​ 1,098 ​ — ​ 1,098 ​ — ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 11,638,289 ​ 10,675,705 ​ — ​ 10,675,705 ​ — ​ Federal funds purchased and securities sold under agreements to repurchase ​ 331,969 ​ 331,969 ​ — ​ 331,969 ​ — ​ Other borrowings ​ 115,754 ​ 119,221 ​ — ​ 119,221 ​ — ​ Accrued interest payable ​ 3,882 ​ 3,882 ​ — ​ 3,882 ​ — ​ Interest rate swap - cash flow hedge ​ 116 ​ 116 ​ — ​ 116 ​ — ​ Interest rate swap - non-designated hedge ​ 7,981 ​ 7,981 ​ — ​ 7,981 ​ — ​ Off balance sheet financial instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to extend credit ​ ​ — ​ (62,060) ​ — ​ (62,060) ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)	Note 14 — Accumulated Other Comprehensive Income (Loss) ​ The changes in each components of accumulated other comprehensive income (loss), net of tax, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrealized Gains ​ ​ ​ ​ ​ ​ ​ ​ ​ and Losses ​ Gains and ​ ​ ​ ​ ​ ​ ​ ​ on Securities ​ Losses on ​ ​ ​ ​ ​ Benefit ​ Available ​ Cash Flow ​ ​ ​ (Dollars in thousands) ​ Plans ​ for Sale ​ Hedges ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at March 31, 2019 ​ $ (6,355) ​ $ (4,906) ​ $ (2,113) ​ $ (13,374) Other comprehensive gain (loss) before reclassifications ​ — ​ 19,183 ​ (8,795) ​ 10,388 Amounts reclassified from accumulated other comprehensive income (loss) ​ 6,058 ​ (1,333) ​ (273) ​ 4,452 Net comprehensive income (loss) ​ 6,058 ​ 17,850 ​ (9,068) ​ 14,840 Balance at June 30, 2019 ​ $ (297) ​ $ 12,944 ​ $ (11,181) ​ $ 1,466 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at March 31, 2018 ​ $ (7,607) ​ $ (22,617) ​ $ (126) ​ $ (30,350) Other comprehensive income (loss) before reclassifications ​ — ​ (6,409) ​ 6 ​ ​ (6,403) Amounts reclassified from accumulated other comprehensive income ​ 151 ​ 500 ​ 31 ​ 682 Net comprehensive income (loss) ​ 151 ​ (5,909) ​ 37 ​ (5,721) Balance at June 30, 2018 ​ $ (7,456) ​ $ (28,526) ​ $ (89) ​ $ (36,071) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2018 ​ $ (6,450) ​ $ (18,394) ​ $ (37) ​ $ (24,881) Other comprehensive income (loss) before reclassifications ​ ​ — ​ ​ 33,092 ​ ​ (10,876) ​ ​ 22,216 Amounts reclassified from accumulated other comprehensive income (loss) ​ 6,153 ​ (1,754) ​ (268) ​ 4,131 Net comprehensive income (loss) ​ 6,153 ​ 31,338 ​ (11,144) ​ 26,347 Balance at June 30, 2019 ​ $ (297) ​ $ 12,944 ​ $ (11,181) ​ $ 1,466 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2017 ​ $ (5,998) ​ $ (4,278) ​ $ (151) ​ $ (10,427) Other comprehensive income (loss) before reclassifications ​ — ​ (23,601) ​ 34 ​ (23,567) Amounts reclassified from accumulated other comprehensive income ​ 302 ​ 500 ​ 68 ​ 870 Net comprehensive income (loss) ​ 302 ​ (23,101) ​ 102 ​ (22,697) AOCI reclassification to retained earnings from the adoption of ASU 2018-02 ​ ​ (1,760) ​ (1,147) ​ (40) ​ (2,947) Balance at June 30, 2018 ​ $ (7,456) ​ $ (28,526) ​ $ (89) ​ $ (36,071) ​ The table below presents the reclassifications out of accumulated other comprehensive income (loss), net of tax: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount Reclassified from Accumulated Other Comprehensive Income (Loss) ​ ​ (Dollars in thousands) ​ For the Three Months Ended June 30, ​ For the Six Months Ended June 30, ​ ​ Accumulated Other Comprehensive Income (Loss) Component 2019 2018 2019 2018 Income Statement Gains (losses) on cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate contracts ​ $ (350) ​ $ 39 ​ $ (343) ​ $ 87 ​ Interest expense ​ ​ ​ 77 ​ ​ (8) ​ 75 ​ ​ (19) ​ Provision for income taxes ​ ​ ​ (273) ​ ​ 31 ​ (268) ​ ​ 68 ​ Net income (Gains) losses on sales of available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ (1,709) ​ $ 641 ​ $ (2,250) ​ $ 641 ​ Securities gains (losses), net ​ ​ ​ 376 ​ ​ (141) ​ ​ 496 ​ ​ (141) ​ Provision for income taxes ​ ​ ​ (1,333) ​ ​ 500 ​ ​ (1,754) ​ ​ 500 ​ Net income Losses and amortization of defined benefit pension: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Actuarial losses ​ $ 7,767 ​ $ 194 ​ $ 7,888 ​ $ 387 ​ Salaries and employee benefits ​ ​ ​ (1,709) ​ ​ (43) ​ (1,735) ​ ​ (85) ​ Provision for income taxes ​ ​ ​ 6,058 ​ ​ 151 ​ 6,153 ​ ​ 302 ​ Net income Total reclassifications for the period ​ $ 4,452 ​ $ 682 ​ $ 4,131 ​ $ 870 ​ ​ ​

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Financial Instruments
Derivative Financial Instruments	Note 15 — Derivative Financial Instruments ​ We use certain derivative instruments to meet the needs of its customers as well as to manage the interest rate risk associated with certain transactions. The following table summarizes the derivative financial instruments utilized by the Company: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2019 ​ ​ ​ ​ June 30, 2018 ​ ​ Balance Sheet ​ Notional ​ Estimated Fair Value ​ Notional ​ Estimated Fair Value (Dollars in thousands) Location Amount Gain Loss Amount Gain Loss ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flow hedges of interest rate risk on Junior Subordinated Debt: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pay fixed rate swap with counterparty ​ Other Liabilities ​ $ — ​ $ — ​ $ — ​ $ 8,000 ​ $ — ​ $ 116 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flow hedges of interest rate risk on FHLB Advances: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pay fixed rate swap with counterparty ​ Other Liabilities ​ $ 700,000 ​ $ — ​ $ 14,334 ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedge of interest rate risk: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pay fixed rate swap with counterparty ​ Other Assets ​ $ 2,784 ​ $ — ​ $ 197 ​ $ 2,824 ​ $ 8 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Not designated hedges of interest rate risk: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer related interest rate contracts: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Matched interest rate swaps with borrowers ​ Other Assets and Other Liabilities ​ $ 432,963 ​ $ 14,561 ​ $ 478 ​ $ 327,027 ​ $ 437 ​ $ 7,947 Matched interest rate swaps with counterparty ​ Other Assets and Other Liabilities ​ $ 432,963 ​ $ — ​ $ 15,277 ​ $ 327,027 ​ $ 7,271 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Not designated hedges of interest rate risk: Foreign Exchange ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Matched foreign exchange swaps with borrower ​ Other Assets ​ $ — ​ $ — ​ $ — ​ $ 2,521 ​ $ — ​ $ 34 Matched foreign exchange swaps with counterparty ​ Other Liabilities ​ $ — ​ $ — ​ $ — ​ $ 2,521 ​ $ 34 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Not designated hedges of interest rate risk - mortgage banking activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Contracts used to hedge mortgage servicing rights ​ Other Assets ​ $ 139,500 ​ $ 1,834 ​ $ — ​ $ 63,500 ​ $ 291 ​ $ — Forward sales commitments used to hedge mortgage pipeline ​ Other Assets ​ $ 93,949 ​ $ 1,192 ​ $ — ​ $ 92,584 ​ ​ 807 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total derivatives ​ ​ ​ $ 1,802,159 ​ $ 17,587 ​ $ 30,286 ​ $ 826,004 ​ $ 8,848 ​ $ 8,097 ​ ​ Cash Flow Hedge of Interest Rate Risk ​ The Company is exposed to interest rate risk in the course of its business operations and manages a portion of this risk through the use of derivative financial instruments, in the form of interest rate swaps. We account for interest rate swaps that are classified as cash flow hedges in accordance with FASB ASC 815, Derivatives and Hedging , which requires that all derivatives be recognized as assets or liabilities on the balance sheet at fair value. We have three cash flow hedges as of June 30, 2019. We had one cash flow hedge mature during the second quarter of 2019. For more information regarding the fair value of our derivative financial instruments, see Note 13 to these financial statements. Our cash flow hedge, in which we utilized an interest rate swap agreement to essentially convert a portion of its variable-rate debt to a fixed rate (cash flow hedge), matured June 15, 2019 and was no longer in existence at June 30, 2019. During 2009, we entered into a forward starting interest rate swap agreement with a notional amount of $8.0 million to manage interest rate risk due to periodic rate resets on its junior subordinated debt issued by SCBT Capital Trust II, an unconsolidated subsidiary of the Company established for the purpose of issuing trust preferred securities. We hedged the variable rate cash flows of subordinated debt against future interest rate increases by using an interest rate swap that effectively fixed the rate on the debt beginning on June 15, 2010, at which time the debt contractually converted from a fixed interest rate to a variable interest rate. The notional amount on which the interest payments were based was not be exchanged. This derivatives contract called for us to pay a fixed rate of 4.06% on the $8.0 million notional amount and receive a variable rate of three-month LIBOR on the $8.0 million notional amount. For the three remaining cash flow hedges, we utilize interest rate swap agreements to manage interest rate risk related to funding through short term FHLB advances. In March 2019, we entered into three-month FHLB advances for $350 million and $150 million for which at this time we plan to continuously renew. At the same time, we entered into interest rate swap agreements with a notional amount of $350 million and $150 million to manage the interest rate risk related to these FHLB advances. In June 2019, we entered into a three-month FHLB advance for $200 million for which at this time we plan to continuously renew. At the same time, we entered into an interest rate swap agreement with a notional amount of $200 million to manage the interest rate risk related to this FHLB advance. With our plan to continually renew and reprice the FHLB advances every three months, we are treating this funding as variable rate funding. We are hedging the cash flows from these FHLB advances against future interest rate increases by using an interest rate swap that effectively fixed the rate on the debt. The notional amount on which the interest payments are based will not be exchanged related to these interest rate swaps. The derivative contract on the $350 million notional amount calls for us to pay a fixed rate of 2.44% and receive a variable rate of three-month LIBOR (2.39 % at June 30, 2019). The derivative contract on the $150 million notional amount calls for us to pay a fixed rate of 2.21% and receive a variable rate of three-month LIBOR (2.33% at June 30, 2019). The derivative contract on the $200 million notational amount calls for us to pay a fixed rate of 1.89% and receive a variable rate of three-month LIBOR (2.52% at June 30, 2019). The hedge for $350 million expires on March 23, 2023, the hedge for $150 million expires on March 29, 2024, and the hedge for the $200 million expires on June 3, 2024. For derivatives designated as hedging exposure to variable cash flows of a forecasted transaction (cash flow hedge), the derivative’s entire gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings when the forecasted transaction affects earnings or when the hedge is terminated. For derivatives that are not designated as hedging instruments, changes in the fair value of the derivatives are recognized in earnings immediately. For designated hedging relationships, we have a third party perform retrospective and prospective effectiveness testing on a quarterly basis using quantitative methods to determine if the hedge is still highly effective. Hedge accounting ceases on transactions that are no longer deemed highly effective, or for which the derivative has been terminated or de-designated. ​ We recognized an after-tax unrealized loss on our cash flow hedges in other comprehensive income of $9.1 million and $11.1 million for the three and six months ended months ended June 30, 2019, respectively. This compares to an unrealized gain of $37,000 and $102,000 for the three and six months ended June 30, 2018. We recognized a $14.3 million cash flow hedge liability in other liabilities on the balance sheet at June 30, 2019, as compared to a $116,000 liability at June 30, 2018. There was no ineffectiveness in the cash flow hedge during the three and six months ended June 30, 2019 and 2018. (See Note 14 – Accumulated Other Comprehensive Income (Loss) for activity in accumulated comprehensive income (loss) and the amounts reclassified into earnings related the cash flow hedges.) ​ Credit risk related to the derivative arises when amounts receivable from the counterparty (derivatives dealer) exceed those payable. We control the risk of loss by only transacting with derivatives dealers that are national market makers whose credit ratings are strong. Each party to the interest rate swap is required to provide collateral in the form of cash or securities to the counterparty when the counterparty’s exposure to a mark-to-market replacement value exceeds certain negotiated limits. These limits are typically based on current credit ratings and vary with ratings changes. As of both June 30, 2019 and 2018, we provided $0 and $300,000 of collateral, respectively, on the cash flow hedge on the junior subordinated debt which is included in cash and cash equivalents on the balance sheet as interest-bearing deposits with banks. As of June 30, 2019, the Company provided $22.8 million of collateral on the cash flow hedges on the FHLB advances which is also included in cash and cash equivalents on the balance sheet as interest-bearing deposits with banks. Also, we have a netting agreement with the counterparties. ​ Balance Sheet Fair Value Hedge ​ We maintain one loan swap, with an aggregate notional amount of $2.8 million at June 30, 2019, accounted for as fair value hedges in accordance with ASC 815, Derivatives and Hedgin g. This derivative protects us from interest rate risk caused by changes in the LIBOR curve in relation to a certain designated fixed rate loan. The derivative converts the fixed rate loan to a floating rate. Settlement occurs in any given period where there is a difference in the stated fixed rate and variable rate. The fair value of this hedge is recorded in either other assets or in other liabilities depending on the position of the hedge. All changes in fair value are recorded through earnings as noninterest income. There was no gain or loss recorded on this derivative for the three and six months ended June 30, 2019 or 2018. ​ Non-designated Hedges of Interest Rate Risk ​ Customer Swap ​ We maintain interest rate swap contracts with customers that are classified as non-designated hedges and are not speculative in nature. These agreements are designed to convert customer’s variable rate loans with the Company to fixed rate. These interest rate swaps are executed with loan customers to facilitate a respective risk management strategy and allow the customer to pay a fixed rate of interest to the Company. These interest rate swaps are simultaneously hedged by executing offsetting interest rate swaps with unrelated market counterparties to minimize the net risk exposure to the Company resulting from the transactions and allow the Company to receive a variable rate of interest. The interest rate swaps pay and receive interest based on a floating rate based on one month LIBOR plus credit spread, with payments being calculated on the notional amount. The interest rate swaps are settled monthly with varying maturities. ​ As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings. As of June 30, 2019, the interest rate swaps had an aggregate notional amount of approximately ​ Foreign Exchange ​ We also enter into foreign exchange contracts with customers to accommodate their need to convert certain foreign currencies into to U.S. Dollars. To offset the foreign exchange risk, we have entered into substantially identical agreements with an unrelated market counterparty to hedge these foreign exchange contracts. At June 30, 2019, there were no outstanding contracts or agreements related to foreign currency. At June 30, 2019, there were foreign exchange contracts of a notional amount of million, representing the amount of contracts outstanding in U.S. dollars. If there were foreign currency contracts outstanding June 30, 2019, the fair value of these contracts would be included in other assets and other liabilities in the accompanying balance sheet. All changes in fair value are recorded as other noninterest income. There was no gain or loss recorded related to the foreign exchange derivative for the three and six months ended June 30, 2019 or 2018. ​ Mortgage Banking ​ We also have derivatives contracts that are classified as non-designated hedges. These derivatives contracts are a part of our risk management strategy for its mortgage banking activities. These instruments may include financial forwards, futures contracts, and options written and purchased, which are used to hedge MSRs; while forward sales commitments are typically used to hedge the mortgage pipeline. Such instruments derive their cash flows, and therefore their values, by reference to an underlying instrument, index or referenced interest rate. We do not elect hedge accounting treatment for any of these derivative instruments and as a result, changes in fair value of the instruments (both gains and losses) are recorded in our consolidated statements of income in mortgage banking income. ​ Mortgage Servicing Rights ​ Derivatives contracts related to MSRs are used to help offset changes in fair value and are written in amounts referred to as notional amounts. Notional amounts provide a basis for calculating payments between counterparties but do not represent amounts to be exchanged between the parties, and are not a measure of financial risk. On June 30, 2019, we had derivative financial instruments outstanding with notional amounts totaling $139.5 million related to MSRs, compared to $63.5 million on June 30, 2018. The estimated net fair value of the open contracts related to the MSRs was recorded as a gain of $1.8 million at June 30, 2019, compared to a gain of $291,000 at June 30, 2018. ​ Mortgage Pipeline ​ The following table presents our notional value of forward sale commitments and the fair value of those obligations along with the fair value of the mortgage pipeline. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) June 30, 2019 December 31, 2018 June 30, 2018 Mortgage loan pipeline ​ $ 117,144 ​ $ 50,442 ​ $ 89,085 Expected closures ​ 87,858 ​ 37,832 ​ 66,813 Fair value of mortgage loan pipeline commitments ​ 1,878 ​ 705 ​ 1,159 Forward sales commitments ​ 93,949 ​ 54,533 ​ 92,584 Fair value of forward commitments ​ (686) ​ (621) ​ (352) ​

Capital Ratios

Capital Ratios	6 Months Ended
	Jun. 30, 2019
Capital Ratios
Capital Ratios	Note 16 — Capital Ratios ​ We are subject to regulations with respect to certain risk-based capital ratios. These risk-based capital ratios measure the relationship of capital to a combination of balance sheet and off-balance sheet risks. The values of both balance sheet and off-balance sheet items are adjusted based on the rules to reflect categorical credit risk. In addition to the risk-based capital ratios, the regulatory agencies have also established a leverage ratio for assessing capital adequacy. The leverage ratio is equal to Tier 1 capital divided by total consolidated on-balance sheet assets (minus amounts deducted from Tier 1 capital). The leverage ratio does not involve assigning risk weights to assets. ​ In July 2013, the Federal Reserve announced its approval of a final rule to implement the regulatory capital reforms developed by the Basel Committee on Banking Supervision (“Basel III”), among other changes required by the Dodd-Frank Wall Street Reform and Consumer Protection Act. The new rules became effective January 1, 2015, subject to a phase-in period for certain aspects of the new rules. ​ As applied to the Company and the Bank, the new rules include a new minimum ratio of common equity Tier 1 capital (“CET1”) to risk-weighted assets of 4.5%. The new rules also raised the minimum required ratio of Tier 1 capital to risk-weighted assets from 4% to 6 %. The minimum required leverage ratio under the new rules is 4 %. The minimum required total capital to risk-weighted assets ratio remains at 8% under the new rules. ​ In order to avoid restrictions on capital distributions and discretionary bonus payments to executives, under the new rules a covered banking organization is also required to maintain a “capital conservation buffer” in addition to its minimum risk-based capital requirements. This buffer is required to consist solely of CET1, and the buffer applies to all three risk-based measurements (CET1, Tier 1 capital and total capital). The capital conservation buffer was phased in incrementally over time, beginning January 1, 2016 and become fully effective on January 1, 2019. The fully phased-in capital conservation buffer consists of an additional amount of Tier 1 common equity equal to 2.5% of risk-weighted assets. ​ The Bank is also subject to the regulatory framework for prompt corrective action, which identifies five capital categories for insured depository institutions (well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized) and is based on specified thresholds for each of the three risk-based regulatory capital ratios (CET1, Tier 1 capital and total capital) and for the leverage ratio. ​ The following table presents actual and required capital ratios as of June 30, 2019, December 31, 2018 and June 30, 2018 for the Company and the Bank under the Basel III capital rules. The minimum required capital amounts presented below include the minimum required capital levels based on the phase-in provisions of the Basel III Capital Rules. The minimum required capital levels plus the capital conservation buffer under the Basel III capital rules became fully phased-in as of January 1, 2019. Capital levels required to be considered well capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Minimum Capital Required to be ​ ​ ​ ​ ​ ​ ​ Required - Basel III ​ Required - Basel III Considered Well ​ ​ Actual ​ Phase-In Schedule ​ Fully Phased In ​ Capitalized ​ (Dollars in thousands) Amount Ratio Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 1,323,535 11.58 % $ 800,109 7.00 % $ 800,109 ​ 7.00 % $ 742,959 6.50 % South State Bank (the Bank) ​ 1,419,395 12.42 % 800,123 7.00 % 800,123 ​ 7.00 % 742,971 6.50 % Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,435,471 12.56 % 971,561 8.50 % 971,561 ​ 8.50 % 914,411 8.00 % South State Bank (the Bank) ​ 1,419,395 12.42 % 971,578 8.50 % 971,578 ​ 8.50 % 914,426 8.00 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,494,019 13.07 % 1,200,164 10.50 % 1,200,164 ​ 10.50 % 1,143,013 10.00 % South State Bank (the Bank) ​ 1,477,943 12.93 % 1,200,184 10.50 % 1,200,184 ​ 10.50 % 1,143,033 10.00 % Tier 1 capital to average assets (leverage ratio): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,435,471 9.99 % 574,940 4.00 % 574,940 ​ 4.00 % 718,675 5.00 % South State Bank (the Bank) ​ 1,419,395 9.88 % 574,780 4.00 % 574,780 ​ 4.00 % 718,475 5.00 % December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 1,335,826 12.05 % $ 706,981 6.38 % $ 776,293 ​ 7.00 % $ 720,844 6.50 % South State Bank (the Bank) ​ 1,427,764 12.87 % 707,039 6.38 % 776,356 ​ 7.00 % 720,902 6.50 % Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,447,428 13.05 % 873,330 7.88 % 942,642 ​ 8.50 % 887,192 8.00 % South State Bank (the Bank) ​ 1,427,764 12.87 % 873,401 7.88 % 942,718 ​ 8.50 % 887,264 8.00 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,503,561 13.56 % 1,095,128 9.88 % 1,164,440 ​ 10.50 % 1,108,990 10.00 % South State Bank (the Bank) ​ 1,483,897 13.38 % 1,095,217 9.88 % 1,164,534 ​ 10.50 % 1,109,080 10.00 % Tier 1 capital to average assets (leverage ratio): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,447,428 10.65 % 543,506 4.00 % 543,506 ​ 4.00 % 679,383 5.00 % South State Bank (the Bank) ​ 1,427,764 10.51 % 543,387 4.00 % 543,387 ​ 4.00 % 679,234 5.00 % June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 1,324,901 12.00 % $ 704,261 6.38 % $ 773,306 ​ 7.00 % $ 718,070 6.50 % South State Bank (the Bank) ​ 1,413,812 12.80 % 704,275 6.38 % 773,321 ​ 7.00 % 718,084 6.50 % Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,436,170 13.00 % 869,970 7.88 % 939,015 ​ 8.50 % 883,779 8.00 % South State Bank (the Bank) ​ 1,413,812 12.80 % 869,986 7.88 % 939,033 ​ 8.50 % 883,796 8.00 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,488,805 13.48 % 1,090,914 9.88 % 1,159,960 ​ 10.50 % 1,104,723 10.00 % South State Bank (the Bank) ​ 1,466,447 13.27 % 1,090,935 9.88 % 1,159,982 ​ 10.50 % 1,104,745 10.00 % Tier 1 capital to average assets (leverage ratio): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,436,170 10.62 % 540,869 4.00 % 540,869 ​ 4.00 % 676,086 5.00 % South State Bank (the Bank) ​ 1,413,812 10.46 % 540,726 4.00 % 540,726 ​ 4.00 % 675,907 5.00 % ​ As of June 30, 2019, December 31, 2018, and June 30, 2018, the capital ratios of the Company and the Bank were well in excess of the minimum regulatory requirements and exceeded the thresholds for the “well capitalized” regulatory classification.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2019
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets	Note 17—Goodwill and Other Intangible Assets ​ The carrying amount of goodwill was $1.0 billion at June 30, 2019. Our other intangible assets, consisting of core deposit intangibles, noncompete intangibles, and client list intangibles are included on the face of the balance sheet. The following is a summary of gross carrying amounts and accumulated amortization of other intangible assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Gross carrying amount ​ $ 119,501 ​ $ 121,736 ​ $ 121,736 ​ Accumulated amortization ​ (63,150) ​ (58,836) ​ (51,761) ​ ​ ​ $ 56,351 ​ $ 62,900 ​ $ 69,975 ​ ​ Amortization expense totaled $3.3 million and $6.5 million for the three and six months ended June 30, 2019, respectively, compared to $3.7 million and $7.1 million for the three and six months ended June 30, 2018, respectively. Other intangibles are amortized using either the straight-line method or an accelerated basis over their estimated useful lives, with lives generally between two and 15 years. Estimated amortization expense for other intangibles for each of the next five quarters is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ ​ ​ ​ Quarter ending: ​ September 30, 2019 ​ $ 3,268 ​ December 31, 2019 ​ 3,267 ​ March 31, 2020 ​ 3,007 ​ June 30, 2020 ​ 2,995 ​ September 30, 2020 ​ ​ 2,945 ​ Thereafter ​ 40,869 ​ ​ ​ $ 56,351 ​ ​

Loan Servicing, Mortgage Origin

Loan Servicing, Mortgage Origination, and Loans Held for Sale	6 Months Ended
	Jun. 30, 2019
Loan Servicing, Mortgage Origination, and Loans Held for Sale
Loan Servicing, Mortgage Origination, and Loans Held for Sale	Note 18 — Loan Servicing, Mortgage Origination, and Loans Held for Sale ​ As of June 30, 2019, December 31, 2018, and June 30, 2018, the portfolio of residential mortgages serviced for others, which is not included in the accompanying balance sheets, was $3.1 billion, $3.1 billion, and $3.0 billion, respectively. Servicing loans for others generally consists of collecting mortgage payments, maintaining escrow accounts and disbursing payments to investors. The amount of contractually specified servicing fees we earned during both the three and six months ended June 30, 2019 and June 30, 2018 was $2.0 million and $3.9 million, and $1.9 million and $3.8 million, respectively. Servicing fees are recorded in mortgage banking income in our consolidated statements of income. ​ At June 30, 2019, December 31, 2018, and June 30, 2018, MSRs were $32.3 million, $34.7 million, and $35.1 million on our consolidated balance sheets, respectively. MSRs are recorded at fair value with changes in fair value recorded as a component of mortgage banking income in the consolidated statements of income. The market value adjustments related to MSRs recorded in mortgage banking income for the three and six months ended June 30, 2019 and June 30, 2018 were losses of $2.6 million and $4.9 million, compared with gains of $429,000 and $2.9 million, respectively. We used various free-standing derivative instruments to mitigate the income statement effect of changes in fair value due to changes in market value adjustments and to changes in valuation inputs and assumptions related to MSRs. ​ See Note 13 — Fair Value for the changes in fair value of MSRs. The following table presents the changes in the fair value of the offsetting hedge. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended Six Months Ended ​ (Dollars in thousands) June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Increase (decrease) in fair value of MSRs ​ $ (2,568) ​ $ 429 ​ $ (4,924) ​ $ 2,945 ​ Decay of MSRs ​ (1,143) ​ (1,141) ​ (2,029) ​ (2,069) ​ Gain (loss) related to derivatives ​ ​ 2,659 ​ ​ (339) ​ ​ 3,940 ​ ​ (1,893) ​ Net effect on statements of income ​ $ (1,052) ​ $ (1,051) ​ $ (3,013) ​ $ (1,017) ​ ​ The fair value of MSRs is highly sensitive to changes in assumptions and fair value is determined by estimating the present value of the asset’s future cash flows utilizing market-based prepayment rates, discount rates and other assumptions validated through comparison to trade information, industry surveys and with the use of independent third-party appraisals. Changes in prepayment speed assumptions have the most significant impact on the fair value of MSRs. Generally, as interest rates increase, mortgage loan prepayments decelerate due to decreased refinance activity, which results in an increase in the fair value of the MSRs. Measurement of fair value is limited to the conditions existing and the assumptions utilized as of a particular point in time, and those assumptions may not be appropriate if they are applied at a different time. See Note 13 — Fair Value for additional information regarding fair value. ​ The characteristics and sensitivity analysis of the MSRs are included in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ ​ December 31, ​ ​ June 30, (Dollars in thousands) 2019 2018 2018 ​ Composition of residential loans serviced for others ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fixed-rate mortgage loans ​ ​ 99.8 % ​ ​ 99.8 % ​ ​ 99.7 % Adjustable-rate mortgage loans ​ ​ 0.2 % ​ ​ 0.2 % ​ ​ 0.3 % Total ​ ​ 100.0 % ​ ​ 100.0 % ​ ​ 100.0 % Weighted average life ​ ​ 6.54 years ​ ​ 7.88 years ​ ​ 8.56 years Constant Prepayment rate (CPR) ​ ​ 10.1 % ​ ​ 7.3 % ​ ​ 6.1 % Weighted average discount rate ​ ​ 9.4 % ​ ​ 9.4 % ​ ​ 9.4 % Effect on fair value due to change in interest rates ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 25 basis point increase ​ $ 2,517 ​ ​ $ 1,504 ​ ​ $ 934 ​ 50 basis point increase ​ ​ 4,621 ​ ​ ​ 2,740 ​ ​ 1,626 ​ 25 basis point decrease ​ ​ (2,575) ​ ​ ​ (1,981) ​ ​ (1,379) ​ 50 basis point decrease ​ ​ (5,540) ​ ​ ​ (4,421) ​ ​ (3,112) ​ ​ The sensitivity calculations in the previous table are hypothetical and should not be considered to be predictive of future performance. Changes in fair value based on adverse changes in assumptions generally cannot be extrapolated because the relationship of the changes in assumptions to fair value may not be linear. Also, the effects of an adverse variation in a particular assumption on the fair value of the MSRs is calculated without changing any other assumptions, while in reality, changes in one factor may result in changing another, which may magnify or contract the effect of the change. ​ Custodial escrow balances maintained in connection with the loan servicing were $27.7 million and $26.0 million at June 30, 2019 and June 30, 2018, respectively. ​ Whole loan sales were $186.5 million and $301.7 million for the three and six months ended June 30, 2019, respectively, compared to $173.7 million and $328.5 million for the three and six months ended June 30, 2018, respectively. For the three and six months ended June 30, 2019, $147.3 million and $236.5 million, or 79.0% and 78.4%, respectively, were sold with the servicing rights retained by the company, compared to $134.6 million and $253.0 million, or 77.5% and 77.0%, for the three and six months ended June 30, 2018, respectively ​ Loans held for sale have historically been comprised of residential mortgage loans awaiting sale in the secondary market, which generally settle in 15 to 45 days . Loans held for sale were $47.8 million, $22.9 million and $37.0 million at June 30, 2019, December 31, 2018 and June 30, 2018, respectively.

Investments in Qualified Afford

Investments in Qualified Affordable Housing Projects	6 Months Ended
	Jun. 30, 2019
Investment In Qualified Affordable Housing Projects.
Investment in Qualified Affordable Housing Projects	Note 19 – Investments in Qualified Affordable Housing Projects ​ We have investments in qualified affordable housing projects (“QAHPs”) that provide low income housing tax credits and operating loss benefits over an extended period. The tax credits and the operating loss tax benefits that are generated by each of the properties are expected to exceed the total value of the investment made by the Company. For the six months ended June 30, 2019, tax credits and other tax benefits of million were recorded. For the six months ended June 30, 2018, tax credits and other tax benefits of $2.4 million and amortization of $2.0 million were recorded. At June 30, 2019 and 2018, our carrying value of QAHPs was $72.2 million and $37.6 million, respectively, with an original investment of $89.2 million. We have million in remaining funding obligations related to these QAHPs recorded in liabilities at June 30, 2019 and 2018, respectively. None of the original investment will be repaid. The investment in QAHPs is being accounted for using the equity method.

Repurchase Agreements

Repurchase Agreements	6 Months Ended
	Jun. 30, 2019
Repurchase Agreements
Repurchase Agreements	Note 20 – Repurchase Agreements ​ Securities sold under agreements to repurchase (“repurchase agreements”) represent funds received from customers, generally on an overnight or continuous basis, which are collateralized by investment securities owned or, at times, borrowed and re-hypothecated by the Company. Repurchase agreements are subject to terms and conditions of the master repurchase agreements between the Company and the client and are accounted for as secured borrowings. Repurchase agreements are included in federal funds purchased and securities sold under agreements to repurchase on the condensed consolidated balance sheets. ​ At June 30, 2019, December 31, 2018 and June 30, 2018, our repurchase agreements totaled $260.4 million, $205.3 million, and $243.1 million, respectively. All of our repurchase agreements were overnight or continuous (until-further-notice) agreements at June 30, 2019, December 31, 2018 and June 30, 2018. These borrowings were collateralized with government, government-sponsored enterprise, or state and political subdivision-issued securities with a carrying value of

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events
Subsequent Events	Note 21 – Subsequent Events ​ In June 2019, the Board of Directors approved and reset the number of shares available to be repurchased to 2,000,000 common shares under the 2019 Stock Repurchase Program (“Repurchase Program”). In July 2019, we repurchased an additional million in common stock. We may repurchase up to an additional ​ We have evaluated subsequent events for accounting and disclosure purposes through the date the financial statements are issued and have determined that there is no additional disclosure necessary.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Summary of Significant Accounting Policies
Leases	Leases (Topic 842) and Method of Adoption ​ On January 1, 2019, we adopted the requirements of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842). Topic 842 was subsequently amended by ASU No. 2018-01, Land Easement Practical Expedient for Transition to Topic 842; ASU No. 2018-10, Codification Improvements to Topic 842, Leases; ASU No. 2018-11, Targeted Improvements; and ASU No. 2019-01, Codification Improvements to Topic 842 Leases. The purpose of the update was to increase transparency and comparability between organizations that enter into lease agreements. The key difference between the previous guidance and the update is the recognition of a right-of-use asset (ROU) and lease liability on the statement of financial position for those leases previously classified as operating leases under the old guidance. Accounting Standards Codification (“ASC”) Topic 842 defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In applying this standard, we reviewed our material contracts to determine if they included a lease by this new definition and did not identify any new leases. Our lease agreements in which ASC Topic 842 has been applied are primarily for real estate properties, including retail branch locations, operations and administration locations and stand-alone ATM locations. These leases have lease terms from greater than 12 months to leases with . Related to lease payment terms, some are fixed payments or based on a fixed annual increases while others are variable and the annual increases are based on market rates. We performed an analysis on equipment leases for the implementation of ASC Topic 842 and determined the number and dollar amount of our equipment leases was not material. ​ A modified retrospective transition approach is required, applying the new standard to all leases existing at the date of initial application. An entity may choose to use either (1) its effective date or (2) the beginning of the earliest comparative period presented in the financial statements as its date of initial application. We chose the transition method of adoption provided by ASU 2018-11, Leases (Topic 842) – Targeted Improvements, where we initially apply the new lease standard at the effective date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption if applicable. Therefore, we applied this standard to all existing leases as of the adoption date of January 1, 2019, recording a ROU asset and a lease liability in an equal amount. We did not have a cumulative-effect adjustment to the opening balance of retained earnings. With this transition method, we did not have to restate comparative prior periods presented in the financial statements related to ASC Topic 842, but will present comparative prior periods disclosures using the previous accounting guidance for leases. This adoption method is considered a change in accounting principle requiring additional disclosure of the nature of and reason for the change, which is solely a result of the adoption of the required standard. ​ ASC Topic 842 provides a package of practical expedients in applying the lease standard that had to be chosen at the date of adoption. We chose to elect this package of practical expedients. With this election, we do not have to reassess whether any expired or existing contracts are or contain a lease, do not have to reassess the classification of any expired or existing leases, do not have to separate lease and non-lease components and can account for both as a single lease component, and do not have to reassess initial direct costs or cash incentives for any existing leases due to immateriality. In addition, we chose not to apply ASC Topic 842 to short-term leases (leases with terms of 12 months or less) and not to record an underlying ROU asset or lease liability based on the uncertainty around the renewal of these leases. We will recognize lease expense for such 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 obligation to make lease payments arising from the lease. We determined that we do not have any leases classified as finance leases and that all of our leases are operating leases. ROU assets and liabilities for operating leases are recognized at commencement date based on present value of lease payments not yet paid, discounted using the discount rate for the lease at the lease commencement date over the lease term. For operating leases, lease expense is determined by the sum of the lease payments to be recognized on a straight-line basis over the lease term. Based on the transition method that we chose to follow, the commencement date of the lease term for all existing leases is January 1, 2019. The lease term used for the calculation of the initial ROU asset and lease liability will include the initial lease term in addition to any renewal options or termination costs in the lease that we think are reasonably certain to be exercised or incurred. We received input from several levels of management and our corporate real estate department in determining which options were reasonably certain to be exercised. A discount rate is also needed in the calculation of the initial ROU assets and lease liability. ASC Topic 842 requires that the implicit rate within the lease agreement be used if available. If not available, we should use its incremental borrowing rate in effect at the time of the lease commencement date. We looked at the incremental borrowing rate from several of our borrowing sources to determine an average rate to be used in the calculation of the initial ROU asset and lease liability. We also considered the term of the borrowings as they relate to the terms of the leases. ​ The adoption of the new standard had a material impact on our consolidated balance sheet, with the recording of ROU asset and lease liability of $82.2 million at the commencement date of January 1, 2019. We did not have a cumulative-effect adjustment to the opening balance of retained earnings at commencement. As of June 30, 2019, we had ROU assets of million recorded within other liabilities on the balance sheet. The adoption of ASC Topic 842 did not have a material impact on our consolidated income statement.
Revenue from Contracts with Customers (Topic 606) and Method of Adoption	Revenue from Contracts with Customers (Topic 606) and Method of Adoption ​ On January 1, 2018, we adopted the requirements of ASU 2014-09, Revenue from Contracts with Customers (“Topic 606”). The majority of our revenue is derived primarily from interest income from receivables (loans) and securities. Other revenues are derived from fees received in connection with deposit accounts, mortgage banking activities including gains from the sale of loans and loan origination fees, and trust and investment advisory services. The core principle of the new standard is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ​ We adopted Topic 606 using the retrospective transition approach which requires restatement of prior periods. We selected this method even though there were no material changes in the timing of revenue recognition due to the fact that Topic 606 requires us to report network costs associated with debit card and ATM transactions netted against the related fees from such transactions. Previously, such network costs were reported as a component of other noninterest expense. We did restate prior periods through March 31, 2018 for this reclassification. This adoption method is considered a change in accounting principle requiring additional disclosure of the nature of and reason for the change, which is solely a result of the adoption of the required standard. When applying the retrospective approach under Topic 606, we elected, as a practical expedient, to apply the revenue standard only to contracts that are not completed as of January 1, 2018. A completed contract is considered to be a contract for which all (or substantially all) of the revenue was recognized in accordance with revenue guidance that was in effect before January 1, 2018. There were no uncompleted contracts as of January 1, 2018 for which application of the new standard required an adjustment to retained earnings. ​ The following disclosures related to Topic 606 involve income derived from contracts with customers. Within the scope of Topic 606, we maintain contracts to provide services, primarily for investment advisory and/or custody of assets. Through our wholly-owned subsidiaries, the Bank and South State Advisory, Inc., we contract with our customers to perform IRA, Trust, and/or Custody and Agency advisory services. million, respectively, for the six months ended June 30, 2019 and 2018. The Bank contracts with our customers to perform deposit account services. Total revenue recognized from these contracts with customers is million, respectively, for the six months ended June 30, 2019 and 2018. Due to the nature of our relationship with the customers that we provide services, we do not incur costs to obtain contracts and there are no material incremental costs to fulfill these contracts that should be capitalized. ​ Disaggregation of Revenue - million, respectively, for the six months ended June 30, 2019 and 2018. Total revenue derived from contracts in which services are transferred over time was million, respectively, for the six months ended June 30, 2019 and 2018. Revenue is recognized as the services are provided to the customers. Economic factors impacting the customers could affect the nature, amount, and timing of these cash flows, as unfavorable economic conditions could impair the customers’ ability to provide payment for services. This risk is mitigated as we generally deduct payments from customers’ accounts as services are rendered. ​ Contract Balances - The timing of revenue recognition, billings, and cash collections results in billed accounts receivable on our balance sheet. Most contracts call for payment by a charge or deduction to the respective customer account but there are some that require a receipt of payment from the customer. For fee per transaction contracts, the customers are billed as the transactions are processed. For hourly rate and monthly service contracts related to trust and some investment revenues, the customers are billed monthly (generally as a percentage basis point of the market value of the investment account). In some cases, specific to South State Advisory, Inc., customers are billed in advance for quarterly services to be performed based on the past quarter’s average account balance. These do create contract liabilities or deferred revenue, as the customers pay in advance for service. Neither the contract liabilities nor the accounts receivables balances are material to our balance sheet. ​ Performance Obligations - A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in Topic 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The performance obligations for these contracts are satisfied as the service is provided to the customer (either over time or at a point in time). The payment terms of the contracts are typically based on a basis point percentage of the investment account market value, fee per hour of service, or fee for service incurred. There are no significant financing components in the contracts. Excluding deposit services revenues which are mostly billed at a point in time as a fee for services incurred, all other contracts within the scope of Topic 606 contain variable consideration in that fees earned are derived from market values of accounts or from hours worked for services performed which determines the amount of consideration to which we are entitled. The variability is resolved when the hours are incurred or services are provided. The contracts do not include obligations for returns, refunds, or warranties. The contracts are specific to the amounts owed to the Company for services performed during a period should the contracts be terminated. ​ Significant Judgments - Revenue is recognized as services are billed to the customers. Variable consideration does exist for contracts related to our trust and investment services as revenues are based on market values and services performed. We have adopted the right-to-invoice practical expedient for trust management contracts through the Bank which we contract with our customers to perform IRA, trust, and/or custody services.

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Investment Securities
Schedule of amortized cost and fair value of investment securities held to maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (Dollars in thousands) Cost Gains Losses Value June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ — ​ $ — ​ $ — ​ $ — ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ — ​ $ — ​ $ — ​ $ — ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ State and municipal obligations ​ $ 499 ​ $ 4 ​ $ — ​ $ 503 ​
Schedule of amortized cost and fair value of investment securities available for sale	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair (Dollars in thousands) Cost Gains Losses Value June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt* ​ $ 65,604 ​ $ 933 ​ $ (8) ​ $ 66,529 ​ State and municipal obligations ​ 177,533 ​ 4,614 ​ (1) ​ 182,146 ​ Mortgage-backed securities** ​ 1,457,544 ​ 13,983 ​ (2,926) ​ 1,468,601 ​ ​ ​ $ 1,700,681 ​ $ 19,530 ​ $ (2,935) ​ $ 1,717,276 ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt* ​ $ 48,982 ​ $ 21 ​ $ (752) ​ $ 48,251 ​ State and municipal obligations ​ 200,184 ​ 1,709 ​ (1,125) ​ 200,768 ​ Mortgage-backed securities** ​ 1,291,484 ​ 697 ​ (24,133) ​ 1,268,048 ​ ​ ​ $ 1,540,650 ​ $ 2,427 ​ $ (26,010) ​ $ 1,517,067 ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt* ​ $ 48,933 ​ $ — ​ $ (1,320) ​ $ 47,613 ​ State and municipal obligations ​ 223,533 ​ 1,932 ​ (1,649) ​ 223,816 ​ Mortgage-backed securities** ​ 1,342,105 ​ 110 ​ (35,645) ​ 1,306,570 ​ ​ ​ $ 1,614,571 ​ $ 2,042 ​ $ (38,614) ​ $ 1,577,999 ​ * - Our government-sponsored entities holdings are comprised of debt securities offered by Federal Home Loan Mortgage Corporation (“FHLMC”) or Freddie Mac, Federal National Mortgage Association (“FNMA”) or Fannie Mae, Federal Home Loan Bank (“FHLB”), and Federal Farm Credit Banks (“FFCB”). ** - All of the mortgage-backed securities are issued by government-sponsored entities; there are no private-label holdings. Also, included in our mortgage-backed securities are debt securities offered by the Small Business Administration (“SBA”), which have the full faith and credit backing of the United States Government.
Schedule of amortized cost and carrying value of other investment securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying (Dollars in thousands) Value June 30, 2019: ​ ​ ​ ​ Federal Home Loan Bank stock ​ $ 43,044 ​ Investment in unconsolidated subsidiaries ​ 3,563 ​ Other nonmarketable investment securities ​ 2,517 ​ ​ ​ $ 49,124 ​ December 31, 2018: ​ ​ ​ ​ Federal Home Loan Bank stock ​ $ 19,524 ​ Investment in unconsolidated subsidiaries ​ 3,563 ​ Other nonmarketable investment securities ​ 2,517 ​ ​ ​ $ 25,604 ​ June 30, 2018: ​ ​ ​ ​ Federal Home Loan Bank stock ​ $ 13,149 ​ Investment in unconsolidated subsidiaries ​ 3,563 ​ Other nonmarketable investment securities ​ 2,517 ​ ​ ​ $ 19,229 ​
Schedule of amortized cost and fair value of debt and equity securities by contractual maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities ​ Securities ​ ​ Held to Maturity ​ Available for Sale ​ ​ Amortized ​ Fair ​ Amortized ​ Fair (Dollars in thousands) Cost Value Cost Value Due in one year or less $ — ​ $ — $ 11,037 $ 11,038 ​ Due after one year through five years ​ — ​ — ​ 52,053 ​ 52,764 ​ Due after five years through ten years ​ — ​ — ​ 402,345 ​ 408,027 ​ Due after ten years ​ — ​ — ​ 1,235,246 ​ 1,245,447 ​ ​ ​ $ — ​ $ — ​ $ 1,700,681 ​ $ 1,717,276 ​
Schedule of securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less Than ​ Twelve Months ​ ​ Twelve Months ​ or More ​ ​ Gross ​ ​ ​ ​ Gross ​ ​ ​ ​ ​ Unrealized ​ Fair ​ Unrealized ​ Fair (Dollars in thousands) Losses Value Losses Value June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities Available for Sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ $ — ​ $ — ​ $ 8 ​ $ 5,742 ​ State and municipal obligations ​ — ​ 1,490 ​ 1 ​ 1,153 ​ Mortgage-backed securities ​ 324 ​ 64,960 ​ 2,602 ​ 330,213 ​ ​ ​ $ 324 ​ $ 66,450 ​ $ 2,611 ​ $ 337,108 ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities Available for Sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ $ 100 ​ $ 10,571 ​ $ 652 ​ $ 32,959 ​ State and municipal obligations ​ 760 ​ 40,387 ​ 365 ​ 14,231 ​ Mortgage-backed securities ​ 5,182 ​ 405,055 ​ 18,951 ​ 755,223 ​ ​ ​ $ 6,042 ​ $ 456,013 ​ $ 19,968 ​ $ 802,413 ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities Available for Sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ $ 1,179 ​ $ 39,145 ​ $ 141 ​ $ 8,468 ​ State and municipal obligations ​ 1,617 ​ 77,373 ​ 32 ​ 1,348 ​ Mortgage-backed securities ​ 21,494 ​ 946,142 ​ 14,151 ​ 331,871 ​ ​ ​ $ 24,290 ​ $ 1,062,660 ​ $ 14,324 ​ $ 341,687 ​

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2019
Loans and Allowance for Loan Losses
Schedule of changes in the carrying value	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, (Dollars in thousands) 2019 2018 Balance at beginning of period ​ $ 485,119 ​ $ 618,803 Net reductions for payments, foreclosures, and accretion ​ (65,139) ​ (67,025) Change in the allowance for loan losses on acquired loans ​ (19) ​ 201 Balance at end of period, net of allowance for loan losses on acquired credit impaired loans ​ $ 419,961 ​ $ 551,979
Schedule of changes in allowance for loan losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-acquired Acquired Non-Credit Acquired Credit ​ ​ (Dollars in thousands) ​ Loans ​ Impaired Loans ​ Impaired Loans ​ Total Three Months Ended June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 52,008 ​ $ — ​ $ 4,514 ​ $ 56,522 ​ Loans charged-off ​ (1,327) ​ ​ (1,535) ​ — ​ (2,862) ​ Recoveries of loans previously charged off (1) ​ 875 ​ ​ 116 ​ — ​ 991 ​ Net charge-offs ​ (452) ​ ​ (1,419) ​ — ​ (1,871) ​ Provision for loan losses charged to operations ​ 2,034 ​ ​ 1,419 ​ 251 ​ 3,704 ​ Reduction due to loan removals ​ — ​ ​ — ​ (142) ​ (142) ​ Balance at end of period ​ $ 53,590 ​ $ — ​ $ 4,623 ​ $ 58,213 ​ Three Months Ended June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 45,203 ​ $ — ​ $ 4,084 ​ $ 49,287 ​ Loans charged-off ​ (1,240) ​ ​ (1,183) ​ — ​ (2,423) ​ Recoveries of loans previously charged off (1) ​ 1,051 ​ ​ 87 ​ — ​ 1,138 ​ Net charge-offs ​ (189) ​ ​ (1,096) ​ — ​ (1,285) ​ Provision for loan losses charged to operations ​ 2,860 ​ ​ 1,096 ​ 522 ​ 4,478 ​ Reduction due to loan removals ​ — ​ ​ — ​ (180) ​ (180) ​ Balance at end of period ​ $ 47,874 ​ $ — ​ $ 4,426 ​ $ 52,300 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-acquired Acquired Non-Credit Acquired Credit ​ ​ (Dollars in thousands) ​ Loans ​ Impaired Loans ​ Impaired Loans ​ Total Six Months Ended June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 51,194 ​ $ — ​ $ 4,604 ​ $ 55,798 ​ Loans charged-off ​ (2,572) ​ ​ (1,909) ​ — ​ (4,481) ​ Recoveries of loans previously charged off (1) ​ 1,627 ​ ​ 322 ​ — ​ 1,949 ​ Net charge-offs ​ (945) ​ ​ (1,587) ​ — ​ (2,532) ​ Provision for loan losses charged to operations ​ 3,341 ​ ​ 1,587 ​ 264 ​ 5,192 ​ Reduction due to loan removals ​ — ​ ​ — ​ (245) ​ (245) ​ Balance at end of period ​ $ 53,590 ​ $ — ​ $ 4,623 ​ $ 58,213 ​ Six Months Ended June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ 43,448 ​ $ — ​ $ 4,627 ​ $ 48,075 ​ Loans charged-off ​ (2,409) ​ ​ (1,517) ​ — ​ (3,926) ​ Recoveries of loans previously charged off (1) ​ 1,853 ​ ​ 252 ​ — ​ 2,105 ​ Net charge-offs ​ (556) ​ ​ (1,265) ​ — ​ (1,821) ​ Provision for losses charged to operations ​ 4,982 ​ ​ 1,265 ​ 685 ​ 6,932 ​ Reduction due to loan removals ​ — ​ ​ — ​ (886) ​ (886) ​ Balance at end of period ​ $ 47,874 ​ $ — ​ $ 4,426 ​ $ 52,300 ​ ​ (1) – Recoveries related to acquired credit impaired loans are recorded through other noninterest income on the consolidated statement of income and do not run through the ALLL.
Summary of information pertaining to impaired loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unpaid Recorded Gross ​ ​ ​ ​ ​ ​ Contractual ​ Investment ​ Recorded ​ Total ​ ​ ​ ​ ​ Principal ​ With No ​ Investment ​ Recorded ​ Related (Dollars in thousands) ​ Balance ​ Allowance ​ With Allowance ​ Investment ​ Allowance June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 36,539 ​ $ 321 ​ $ 35,809 ​ $ 36,130 ​ $ 715 Commercial non-owner occupied ​ 187 ​ 85 ​ 16 ​ 101 ​ 1 Commercial owner occupied ​ 6,673 ​ 3,833 ​ 1,607 ​ 5,440 ​ 33 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 5,989 ​ 3,983 ​ 1,583 ​ 5,566 ​ 35 Home equity loans ​ 2,566 ​ 1,084 ​ 1,352 ​ 2,436 ​ 125 Commercial and industrial ​ 2,708 ​ 509 ​ 2,165 ​ 2,674 ​ 394 Other income producing property ​ 2,333 ​ 129 ​ 1,935 ​ 2,064 ​ 78 Consumer ​ 158 ​ — ​ 98 ​ 98 ​ 3 Total ​ $ 57,153 ​ $ 9,944 ​ $ 44,565 ​ $ 54,509 ​ $ 1,384 December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 38,314 ​ $ 339 ​ $ 37,574 ​ $ 37,913 ​ $ 788 Commercial non-owner occupied ​ 1,157 ​ 536 ​ 489 ​ 1,025 ​ 70 Commercial owner occupied ​ 5,085 ​ 3,101 ​ 1,041 ​ 4,142 ​ 27 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 7,291 ​ 4,992 ​ 1,769 ​ 6,761 ​ 41 Home equity loans ​ 2,953 ​ 1,129 ​ 1,697 ​ 2,826 ​ 142 Commercial and industrial ​ 1,332 ​ 467 ​ 824 ​ 1,291 ​ 416 Other income producing property ​ 3,117 ​ 150 ​ 2,722 ​ 2,872 ​ 142 Consumer ​ 211 ​ — ​ 188 ​ 188 ​ 2 Total ​ $ 59,460 ​ $ 10,714 ​ $ 46,304 ​ $ 57,018 ​ $ 1,628 June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 42,955 ​ $ 600 ​ $ 41,792 ​ $ 42,392 ​ $ 846 Commercial non-owner occupied ​ 1,505 ​ 831 ​ 517 ​ 1,348 ​ 93 Commercial owner occupied ​ 5,733 ​ 3,031 ​ 1,719 ​ 4,750 ​ 44 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 6,085 ​ 4,631 ​ 997 ​ 5,628 ​ 30 Home equity loans ​ 3,256 ​ 1,146 ​ 1,998 ​ 3,144 ​ 180 Commercial and industrial ​ 1,876 ​ 724 ​ 1,110 ​ 1,834 ​ 485 Other income producing property ​ 3,473 ​ 234 ​ 3,006 ​ 3,240 ​ 144 Consumer ​ ​ 325 ​ — ​ 257 ​ ​ 257 ​ ​ 7 Total ​ $ 65,208 ​ $ 11,197 ​ $ 51,396 ​ $ 62,593 ​ $ 1,829
Summary of average investment in impaired loans and interest income recognized on impaired loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ ​ 2019 ​ 2018 ​ ​ Average ​ ​ ​ ​ Average ​ ​ ​ ​ ​ Investment in ​ Interest Income ​ Investment in ​ Interest Income (Dollars in thousands) Impaired Loans Recognized Impaired Loans Recognized Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 37,194 ​ $ 310 ​ $ 44,295 ​ $ 298 Commercial non-owner occupied ​ 238 ​ 2 ​ 1,265 ​ 9 Commercial owner occupied ​ 4,830 ​ 94 ​ 5,164 ​ 72 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 6,226 ​ 44 ​ 5,561 ​ 44 Home equity loans ​ 2,595 ​ 32 ​ 3,156 ​ 36 Commercial and industrial ​ 1,994 ​ 66 ​ 1,756 ​ 19 Other income producing property ​ 2,210 ​ 24 ​ 3,163 ​ 42 Consumer ​ 104 ​ — ​ 285 ​ — Total Impaired Loans ​ $ 55,391 ​ $ 572 ​ $ 64,645 ​ $ 520 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, ​ ​ 2019 ​ 2018 ​ ​ Average ​ ​ ​ ​ Average ​ ​ ​ ​ ​ Investment in ​ Interest Income ​ Investment in ​ Interest Income (Dollars in thousands) Impaired Loans Recognized Impaired Loans Recognized Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 37,021 ​ $ 791 ​ $ 42,811 ​ $ 810 Commercial non-owner occupied ​ 563 ​ 4 ​ 1,362 ​ 15 Commercial owner occupied ​ 4,791 ​ 161 ​ 5,196 ​ 147 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 6,164 ​ 93 ​ 5,630 ​ 87 Home equity loans ​ 2,631 ​ 64 ​ 3,077 ​ 65 Commercial and industrial ​ 1,982 ​ 86 ​ 1,495 ​ 36 Other income producing property ​ 2,468 ​ 54 ​ 3,189 ​ 88 Consumer ​ 144 ​ — ​ 248 ​ — Other loans ​ — ​ — ​ — ​ — Total Impaired Loans ​ $ 55,764 ​ $ 1,253 ​ $ 63,008 ​ $ 1,248 ​
Non-acquired loans
Loans and Allowance for Loan Losses
Summary of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Non-acquired loans: ​ ​ ​ ​ ​ ​ ​ Commercial non-owner occupied real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 879,724 ​ $ 841,445 ​ $ 906,890 ​ Commercial non-owner occupied ​ 1,723,640 ​ 1,415,551 ​ 1,135,235 ​ Total commercial non-owner occupied real estate ​ 2,603,364 ​ 2,256,996 ​ 2,042,125 ​ Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 2,079,949 ​ 1,936,265 ​ 1,733,924 ​ Home equity loans ​ 514,242 ​ 495,148 ​ 456,946 ​ Total consumer real estate ​ 2,594,191 ​ 2,431,413 ​ 2,190,870 ​ Commercial owner occupied real estate ​ 1,589,987 ​ 1,517,551 ​ 1,372,453 ​ Commercial and industrial ​ 1,114,513 ​ 1,054,952 ​ 941,067 ​ Other income producing property ​ 214,203 ​ 214,353 ​ 205,507 ​ Consumer ​ 503,468 ​ 448,664 ​ 416,650 ​ Other loans ​ 1,601 ​ 9,357 ​ 28,867 ​ Total non-acquired loans ​ 8,621,327 ​ 7,933,286 ​ 7,197,539 ​ Less allowance for loan losses ​ (53,590) ​ (51,194) ​ (47,874) ​ Non-acquired loans, net ​ $ 8,567,737 ​ $ 7,882,092 ​ $ 7,149,665 ​
Schedule of changes in allowance for loan losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ ​ ​ Other Income ​ ​ ​ ​ ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ Other ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Loans ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, March 31, 2019 ​ $ 5,371 ​ $ 9,740 ​ $ 9,629 ​ $ 12,058 ​ $ 3,273 ​ $ 7,249 ​ $ 1,387 ​ $ 3,195 ​ $ 106 ​ $ 52,008 Charge-offs ​ (9) ​ (3) ​ — ​ (48) ​ — ​ (90) ​ (31) ​ (1,146) ​ — ​ (1,327) Recoveries ​ 326 ​ 23 ​ 41 ​ 30 ​ 98 ​ 138 ​ 13 ​ 206 ​ — ​ 875 Provision (benefit) ​ 30 ​ 551 ​ (144) ​ 392 ​ (194) ​ 198 ​ (10) ​ 1,317 ​ (106) ​ 2,034 Balance, June 30, 2019 ​ $ 5,718 ​ $ 10,311 ​ $ 9,526 ​ $ 12,432 ​ $ 3,177 ​ $ 7,495 ​ $ 1,359 ​ $ 3,572 ​ $ — ​ $ 53,590 Loans individually evaluated for impairment ​ $ 715 ​ $ 1 ​ $ 33 ​ $ 35 ​ $ 125 ​ $ 394 ​ $ 78 ​ $ 3 ​ $ — ​ $ 1,384 Loans collectively evaluated for impairment ​ $ 5,003 ​ $ 10,310 ​ $ 9,493 ​ $ 12,397 ​ $ 3,052 ​ $ 7,101 ​ $ 1,281 ​ $ 3,569 ​ $ — ​ $ 52,206 Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ 36,130 ​ $ 101 ​ $ 5,440 ​ $ 5,566 ​ $ 2,436 ​ $ 2,674 ​ $ 2,064 ​ $ 98 ​ $ — ​ $ 54,509 Loans collectively evaluated for impairment ​ 843,594 ​ 1,723,539 ​ 1,584,547 ​ 2,074,383 ​ 511,806 ​ 1,111,839 ​ 212,139 ​ 503,370 ​ 1,601 ​ 8,566,818 Total non-acquired loans ​ $ 879,724 ​ $ 1,723,640 ​ $ 1,589,987 ​ $ 2,079,949 ​ $ 514,242 ​ $ 1,114,513 ​ $ 214,203 ​ $ 503,468 ​ $ 1,601 ​ $ 8,621,327 Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, March 31, 2018 ​ $ 5,847 ​ $ 6,798 ​ $ 8,346 ​ $ 10,193 ​ $ 3,237 ​ $ 6,333 ​ $ 1,393 ​ $ 2,899 ​ $ 157 ​ $ 45,203 Charge-offs ​ — ​ — ​ (81) ​ — ​ (5) ​ (59) ​ — ​ (1,095) ​ — ​ (1,240) Recoveries ​ 547 ​ 2 ​ 25 ​ 41 ​ 27 ​ 199 ​ 3 ​ 207 ​ — ​ 1,051 Provision (benefit) ​ (207) ​ 409 ​ 317 ​ 711 ​ 109 ​ 238 ​ 17 ​ 1,060 ​ 206 ​ 2,860 Balance, June 30, 2018 ​ $ 6,187 ​ $ 7,209 ​ $ 8,607 ​ $ 10,945 ​ $ 3,368 ​ $ 6,711 ​ $ 1,413 ​ $ 3,071 ​ $ 363 ​ $ 47,874 Loans individually evaluated for impairment ​ $ 846 ​ $ 93 ​ $ 44 ​ $ 30 ​ $ 180 ​ $ 485 ​ $ 144 ​ $ 7 ​ $ — ​ $ 1,829 Loans collectively evaluated for impairment ​ $ 5,341 ​ $ 7,116 ​ $ 8,563 ​ $ 10,915 ​ $ 3,188 ​ $ 6,226 ​ $ 1,269 ​ $ 3,064 ​ $ 363 ​ $ 46,045 Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ 42,392 ​ $ 1,348 ​ $ 4,750 ​ $ 5,628 ​ $ 3,144 ​ $ 1,834 ​ $ 3,240 ​ $ 257 ​ $ — ​ $ 62,593 Loans collectively evaluated for impairment ​ 864,498 ​ 1,133,887 ​ 1,367,703 ​ 1,728,296 ​ 453,802 ​ 939,233 ​ 202,267 ​ 416,393 ​ 28,867 ​ 7,134,946 Total non-acquired loans ​ $ 906,890 ​ $ 1,135,235 ​ $ 1,372,453 ​ $ 1,733,924 ​ $ 456,946 ​ $ 941,067 ​ $ 205,507 ​ $ 416,650 ​ $ 28,867 ​ $ 7,197,539 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ ​ ​ Other Income ​ ​ ​ ​ ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ Other ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Loans ​ Total Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2018 ​ $ 5,682 ​ $ 8,754 ​ $ 9,369 ​ $ 11,913 ​ $ 3,434 ​ $ 7,454 ​ $ 1,446 ​ $ 3,101 ​ $ 41 ​ $ 51,194 Charge-offs ​ (9) ​ (3) ​ (12) ​ (85) ​ (15) ​ (109) ​ (31) ​ (2,308) ​ — ​ (2,572) Recoveries ​ 625 ​ 45 ​ 66 ​ 32 ​ 134 ​ 209 ​ 58 ​ 458 ​ — ​ 1,627 Provision (benefit) ​ (580) ​ 1,515 ​ 103 ​ 572 ​ (376) ​ (59) ​ (114) ​ 2,321 ​ (41) ​ 3,341 Balance, June 30, 2019 ​ $ 5,718 ​ $ 10,311 ​ $ 9,526 ​ $ 12,432 ​ $ 3,177 ​ $ 7,495 ​ $ 1,359 ​ $ 3,572 ​ $ — ​ $ 53,590 Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2017 ​ $ 5,921 ​ $ 6,525 ​ $ 8,128 ​ $ 9,668 ​ $ 3,250 ​ $ 5,488 ​ $ 1,375 ​ $ 2,788 ​ $ 305 ​ $ 43,448 Charge-offs ​ (35) ​ — ​ (81) ​ (4) ​ (71) ​ (144) ​ — ​ (2,074) ​ — ​ (2,409) Recoveries ​ 989 ​ 4 ​ 33 ​ 64 ​ 128 ​ 214 ​ 11 ​ 410 ​ — ​ 1,853 Provision (benefit) ​ (688) ​ 680 ​ 527 ​ 1,217 ​ 61 ​ 1,153 ​ 27 ​ 1,947 ​ 58 ​ 4,982 Balance, June 30, 2018 ​ $ 6,187 ​ $ 7,209 ​ $ 8,607 ​ $ 10,945 ​ $ 3,368 ​ $ 6,711 ​ $ 1,413 ​ $ 3,071 ​ $ 363 ​ $ 47,874
Schedule of credit risk profile by risk grade of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Non-acquired Loans ​ ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 Pass ​ $ 8,504,898 ​ $ 7,813,938 ​ $ 7,082,951 ​ Special mention ​ 66,580 ​ 66,645 ​ 67,388 ​ Substandard ​ 49,849 ​ 52,703 ​ 47,200 ​ Doubtful ​ — ​ — ​ — ​ ​ ​ $ 8,621,327 ​ $ 7,933,286 ​ $ 7,197,539 ​
Aging analysis of past due loans (includes nonaccrual loans), segregated by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 Days 60 - 89 Days 90+ Days Total ​ ​ Total (Dollars in thousands) ​ Past Due ​ Past Due ​ Past Due ​ Past Due ​ Current ​ Loans June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 630 ​ $ 54 ​ $ 498 ​ $ 1,182 ​ $ 878,542 ​ $ 879,724 Commercial non-owner occupied ​ — ​ — ​ — ​ — ​ 1,723,640 ​ 1,723,640 Commercial owner occupied ​ 1,474 ​ 4,514 ​ 1,161 ​ 7,149 ​ 1,582,838 ​ 1,589,987 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 669 ​ 215 ​ 2,953 ​ 3,837 ​ 2,076,112 ​ 2,079,949 Home equity loans ​ 424 ​ 136 ​ 592 ​ 1,152 ​ 513,090 ​ 514,242 Commercial and industrial ​ 1,007 ​ 369 ​ 107 ​ 1,483 ​ 1,113,030 ​ 1,114,513 Other income producing property ​ 674 ​ 514 ​ 110 ​ 1,298 ​ 212,905 ​ 214,203 Consumer ​ 676 ​ 415 ​ 746 ​ 1,837 ​ 501,631 ​ 503,468 Other loans ​ — ​ — ​ — ​ — ​ 1,601 ​ 1,601 ​ ​ $ 5,554 ​ $ 6,217 ​ $ 6,167 ​ $ 17,938 ​ $ 8,603,389 ​ $ 8,621,327 December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 693 ​ $ 305 ​ $ 452 ​ $ 1,450 ​ $ 839,995 ​ $ 841,445 Commercial non-owner occupied ​ 68 ​ 18 ​ 396 ​ 482 ​ 1,415,069 ​ 1,415,551 Commercial owner occupied ​ 1,639 ​ 1,495 ​ 904 ​ 4,038 ​ 1,513,513 ​ 1,517,551 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 1,460 ​ 789 ​ 943 ​ 3,192 ​ 1,933,073 ​ 1,936,265 Home equity loans ​ 744 ​ 532 ​ 713 ​ 1,989 ​ 493,159 ​ 495,148 Commercial and industrial ​ 898 ​ 120 ​ 573 ​ 1,591 ​ 1,053,361 ​ 1,054,952 Other income producing property ​ 169 ​ 26 ​ 289 ​ 484 ​ 213,869 ​ 214,353 Consumer ​ 437 ​ 174 ​ 718 ​ 1,329 ​ 447,335 ​ 448,664 Other loans ​ — ​ — ​ — ​ — ​ 9,357 ​ 9,357 ​ ​ $ 6,108 ​ $ 3,459 ​ $ 4,988 ​ $ 14,555 ​ $ 7,918,731 ​ $ 7,933,286 June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 1,222 ​ $ — ​ $ 344 ​ $ 1,566 ​ $ 905,324 ​ $ 906,890 Commercial non-owner occupied ​ 354 ​ 19 ​ 659 ​ 1,032 ​ 1,134,203 ​ 1,135,235 Commercial owner occupied ​ 1,578 ​ 1,599 ​ 1,314 ​ 4,491 ​ 1,367,962 ​ 1,372,453 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 479 ​ 387 ​ 900 ​ 1,766 ​ 1,732,158 ​ 1,733,924 Home equity loans ​ 913 ​ 473 ​ 1,114 ​ 2,500 ​ 454,446 ​ 456,946 Commercial and industrial ​ 762 ​ 94 ​ 815 ​ 1,671 ​ 939,396 ​ 941,067 Other income producing property ​ 157 ​ 5 ​ 259 ​ 421 ​ 205,086 ​ 205,507 Consumer ​ 475 ​ 202 ​ 557 ​ 1,234 ​ 415,416 ​ 416,650 Other loans ​ — ​ — ​ — ​ — ​ 28,867 ​ 28,867 ​ ​ $ 5,940 ​ $ 2,779 ​ $ 5,962 ​ $ 14,681 ​ $ 7,182,858 ​ $ 7,197,539
Non-acquired loans | Consumer
Loans and Allowance for Loan Losses
Schedule of credit risk profile by risk grade of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer Owner Occupied ​ Home Equity ​ Consumer ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 2,052,808 ​ $ 1,909,427 ​ $ 1,706,574 ​ $ 502,305 ​ $ 481,607 ​ $ 443,953 ​ $ 501,474 ​ $ 446,823 ​ $ 415,053 ​ Special mention ​ 9,936 ​ 11,304 ​ 12,566 ​ 5,731 ​ 7,293 ​ 6,805 ​ 443 ​ 437 ​ 623 ​ Substandard ​ 17,205 ​ 15,534 ​ 14,784 ​ 6,206 ​ 6,248 ​ 6,188 ​ 1,551 ​ 1,404 ​ 974 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 2,079,949 ​ $ 1,936,265 ​ $ 1,733,924 ​ $ 514,242 ​ $ 495,148 ​ $ 456,946 ​ $ 503,468 ​ $ 448,664 ​ $ 416,650 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ Consumer Total ​ June 30, 2019 December 31, 2018 June 30, 2018 June 30, 2019 December 31, 2018 June 30, 2018 Pass ​ $ 1,601 ​ $ 9,357 ​ $ 28,867 ​ $ 3,058,188 ​ $ 2,847,214 ​ $ 2,594,447 ​ Special mention ​ — ​ — ​ — ​ 16,110 ​ 19,034 ​ 19,994 ​ Substandard ​ — ​ — ​ — ​ 24,962 ​ 23,186 ​ 21,946 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 1,601 ​ $ 9,357 ​ $ 28,867 ​ $ 3,099,260 ​ $ 2,889,434 ​ $ 2,636,387 ​
Non-acquired loans | Commercial loans
Loans and Allowance for Loan Losses
Schedule of credit risk profile by risk grade of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction & Development ​ Commercial Non-owner Occupied ​ Commercial Owner Occupied ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 871,393 ​ $ 832,612 ​ $ 895,887 ​ $ 1,714,606 ​ $ 1,407,744 ​ $ 1,126,099 ​ $ 1,561,594 ​ $ 1,480,267 ​ $ 1,343,624 ​ Special mention ​ 5,948 ​ 6,015 ​ 7,858 ​ 7,557 ​ 6,427 ​ 7,378 ​ 16,310 ​ 24,576 ​ 18,808 ​ Substandard ​ 2,383 ​ 2,818 ​ 3,145 ​ 1,477 ​ 1,380 ​ 1,758 ​ 12,083 ​ 12,708 ​ 10,021 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 879,724 ​ $ 841,445 ​ $ 906,890 ​ $ 1,723,640 ​ $ 1,415,551 ​ $ 1,135,235 ​ $ 1,589,987 ​ $ 1,517,551 ​ $ 1,372,453 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial & Industrial ​ Other Income Producing Property ​ Commercial Total ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 1,090,519 ​ $ 1,037,915 ​ $ 923,995 ​ $ 208,598 ​ $ 208,186 ​ $ 198,899 ​ $ 5,446,710 ​ $ 4,966,724 ​ $ 4,488,504 ​ Special mention ​ 16,279 ​ 5,887 ​ 8,522 ​ 4,376 ​ 4,706 ​ 4,828 ​ 50,470 ​ 47,611 ​ 47,394 ​ Substandard ​ 7,715 ​ 11,150 ​ 8,550 ​ 1,229 ​ 1,461 ​ 1,780 ​ 24,887 ​ 29,517 ​ 25,254 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 1,114,513 ​ $ 1,054,952 ​ $ 941,067 ​ $ 214,203 ​ $ 214,353 ​ $ 205,507 ​ $ 5,522,067 ​ $ 5,043,852 ​ $ 4,561,152 ​
Acquired credit impaired loans
Loans and Allowance for Loan Losses
Summary of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Acquired credit impaired loans: ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ $ 164,540 ​ $ 196,764 ​ $ 227,739 ​ Commercial real estate—construction and development ​ 27,014 ​ 32,942 ​ 40,951 ​ Residential real estate ​ 184,208 ​ 207,482 ​ 229,502 ​ Consumer ​ 38,624 ​ 42,492 ​ 45,633 ​ Commercial and industrial ​ 10,198 ​ 10,043 ​ 12,580 ​ Acquired credit impaired loans ​ 424,584 ​ 489,723 ​ 556,405 ​ Less allowance for loan losses ​ (4,623) ​ (4,604) ​ (4,426) ​ Acquired credit impaired loans, net ​ $ 419,961 ​ $ 485,119 ​ $ 551,979 ​
Schedule of contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting carrying values	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Contractual principal and interest ​ $ 538,730 ​ $ 626,691 ​ $ 717,180 ​ Non-accretable difference ​ (18,156) ​ (24,818) ​ (43,397) ​ Cash flows expected to be collected ​ 520,574 ​ 601,873 ​ 673,783 ​ Accretable yield ​ (100,613) ​ (116,754) ​ (121,804) ​ Carrying value ​ $ 419,961 ​ $ 485,119 ​ $ 551,979 ​
Schedule of refined accretable yield balance	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, (Dollars in thousands) 2019 2018 Balance at beginning of period ​ $ 116,754 ​ $ 133,096 PSC acquisition Day 1 adjustment ​ ​ — ​ ​ (1,460) Contractual interest income ​ (14,189) ​ (17,050) Accretion on acquired credit impaired loans ​ ​ (10,287) ​ ​ (9,013) Reclass of nonaccretable difference due to improvement in expected cash flows ​ 8,468 ​ 16,453 Other changes, net ​ (133) ​ (222) Balance at end of period ​ $ 100,613 ​ $ 121,804
Schedule of changes in allowance for loan losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real Estate- ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ Construction and ​ Residential ​ ​ ​ ​ Commercial ​ ​ ​ (Dollars in thousands) ​ Real Estate ​ Development ​ Real Estate ​ Consumer ​ and Industrial ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, March 31, 2019 ​ $ 847 ​ $ 717 ​ $ 2,164 ​ $ 707 ​ $ 79 ​ $ 4,514 Provision (benefit) for loan losses ​ 162 ​ 81 ​ 279 ​ (237) ​ (34) ​ 251 Reduction due to loan removals ​ — ​ — ​ (97) ​ — ​ (45) ​ (142) Balance, June 30, 2019 ​ $ 1,009 ​ $ 798 ​ $ 2,346 ​ $ 470 ​ $ — ​ $ 4,623 Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ $ 1,009 ​ $ 798 ​ $ 2,346 ​ $ 470 ​ $ — ​ $ 4,623 Loans:* ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ 164,540 ​ 27,014 ​ 184,208 ​ 38,624 ​ 10,198 ​ 424,584 Total acquired credit impaired loans ​ $ 164,540 ​ $ 27,014 ​ $ 184,208 ​ $ 38,624 ​ $ 10,198 ​ $ 424,584 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance , March 31, 2018 ​ $ 261 ​ $ 215 ​ $ 2,509 ​ $ 594 ​ $ 505 ​ $ 4,084 Provision (benefit) for loan losses ​ 375 ​ 390 ​ 137 ​ (19) ​ (361) ​ 522 Reduction due to loan removals ​ — ​ (29) ​ (132) ​ (3) ​ (16) ​ (180) Balance, June 30, 2018 ​ $ 636 ​ $ 576 ​ $ 2,514 ​ $ 572 ​ $ 128 ​ $ 4,426 Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ $ 636 ​ $ 576 ​ $ 2,514 ​ $ 572 ​ $ 128 ​ $ 4,426 Loans:* ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — Loans collectively evaluated for impairment ​ 227,739 ​ 40,951 ​ 229,502 ​ 45,633 ​ 12,580 ​ 556,405 Total acquired credit impaired loans ​ $ 227,739 ​ $ 40,951 ​ $ 229,502 ​ $ 45,633 ​ $ 12,580 ​ $ 556,405 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real Estate- ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ Construction and ​ Residential ​ ​ ​ ​ Commercial ​ ​ ​ (Dollars in thousands) ​ Real Estate ​ Development ​ Real Estate ​ Consumer ​ and Industrial ​ Total Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2018 ​ $ 801 ​ $ 717 ​ $ 2,246 ​ $ 761 ​ $ 79 ​ $ 4,604 Provision (benefit) for loan losses ​ 213 ​ 81 ​ 295 ​ (291) ​ (34) ​ 264 Reduction due to loan removals ​ (5) ​ — ​ (195) ​ — ​ (45) ​ (245) Balance, June 30, 2019 ​ $ 1,009 ​ $ 798 ​ $ 2,346 ​ $ 470 ​ $ — ​ $ 4,623 Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2017 ​ $ 288 ​ $ 180 ​ $ 3,553 ​ $ 461 ​ $ 145 ​ $ 4,627 Provision (benefit) for loan losses ​ 361 ​ 478 ​ (807) ​ 114 ​ 539 ​ 685 Reduction due to loan removals ​ (13) ​ (82) ​ (232) ​ (3) ​ (556) ​ (886) Balance, June 30, 2018 ​ $ 636 ​ $ 576 ​ $ 2,514 ​ $ 572 ​ $ 128 ​ $ 4,426 ​ ​ *— The carrying value of acquired credit impaired loans includes a non-accretable difference which is primarily associated with the assessment of credit quality of acquired loans. ​
Schedule of credit risk profile by risk grade of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Real Estate— ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and ​ ​ Commercial Real Estate ​ Development ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 2019 2018 2018 Pass ​ $ 132,852 ​ $ 160,788 ​ $ 177,996 ​ $ 18,665 ​ $ 20,293 ​ $ 25,243 ​ Special mention ​ 13,811 ​ 14,393 ​ 22,568 ​ 3,181 ​ 3,001 ​ 4,884 ​ Substandard ​ 17,877 ​ 21,583 ​ 27,175 ​ 5,168 ​ 9,648 ​ 10,824 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 164,540 ​ $ 196,764 ​ $ 227,739 ​ $ 27,014 ​ $ 32,942 ​ $ 40,951 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential Real Estate ​ Consumer ​ Commercial & Industrial ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 93,303 ​ $ 104,181 ​ $ 116,461 ​ $ 4,896 ​ $ 5,751 ​ $ 6,144 ​ $ 6,389 ​ $ 5,093 ​ $ 6,161 ​ Special mention ​ 39,020 ​ 41,964 ​ 46,089 ​ 13,250 ​ 14,484 ​ 15,613 ​ 508 ​ 546 ​ 1,139 ​ Substandard ​ 51,885 ​ 61,337 ​ 66,952 ​ 20,478 ​ 22,257 ​ 23,876 ​ 3,301 ​ 4,404 ​ 5,280 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 184,208 ​ $ 207,482 ​ $ 229,502 ​ $ 38,624 ​ $ 42,492 ​ $ 45,633 ​ $ 10,198 ​ $ 10,043 ​ $ 12,580 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Acquired ​ ​ ​ Credit Impaired Loans ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ ​ 2019 2018 2018 Pass ​ $ 256,105 ​ $ 296,106 ​ $ 332,005 ​ Special mention ​ 69,770 ​ 74,388 ​ 90,293 ​ Substandard ​ 98,709 ​ 119,229 ​ 134,107 ​ Doubtful ​ — ​ — ​ — ​ ​ ​ $ 424,584 ​ $ 489,723 ​ $ 556,405 ​
Aging analysis of past due loans (includes nonaccrual loans), segregated by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 Days 60 - 89 Days 90+ Days Total ​ ​ Total (Dollars in thousands) ​ Past Due ​ Past Due ​ Past Due ​ Past Due ​ Current ​ Loans June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ $ 883 ​ $ 244 ​ $ 4,263 ​ $ 5,390 ​ $ 159,150 ​ $ 164,540 Commercial real estate—construction and development ​ 126 ​ — ​ 152 ​ 278 ​ 26,736 ​ 27,014 Residential real estate ​ 3,011 ​ 2,101 ​ 4,302 ​ 9,414 ​ 174,794 ​ 184,208 Consumer ​ 567 ​ 174 ​ 664 ​ 1,405 ​ 37,219 ​ 38,624 Commercial and industrial ​ 49 ​ — ​ 80 ​ 129 ​ 10,069 ​ 10,198 ​ ​ $ 4,636 ​ $ 2,519 ​ $ 9,461 ​ $ 16,616 ​ $ 407,968 ​ $ 424,584 December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ $ 876 ​ $ 112 ​ $ 4,533 ​ $ 5,521 ​ $ 191,243 ​ $ 196,764 Commercial real estate—construction and development ​ 115 ​ 12 ​ 2,816 ​ 2,943 ​ 29,999 ​ 32,942 Residential real estate ​ 4,620 ​ 1,251 ​ 8,487 ​ 14,358 ​ 193,124 ​ 207,482 Consumer ​ 722 ​ 90 ​ 839 ​ 1,651 ​ 40,841 ​ 42,492 Commercial and industrial ​ 2,437 ​ — ​ 88 ​ 2,525 ​ 7,518 ​ 10,043 ​ ​ $ 8,770 ​ $ 1,465 ​ $ 16,763 ​ $ 26,998 ​ $ 462,725 ​ $ 489,723 June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate ​ $ 621 ​ $ 553 ​ $ 7,637 ​ $ 8,811 ​ $ 218,928 ​ $ 227,739 Commercial real estate—construction and development ​ 175 ​ — ​ 3,212 ​ 3,387 ​ 37,564 ​ 40,951 Residential real estate ​ 5,279 ​ 3,989 ​ 6,948 ​ 16,216 ​ 213,286 ​ 229,502 Consumer ​ 767 ​ 174 ​ 763 ​ 1,704 ​ 43,929 ​ 45,633 Commercial and industrial ​ 125 ​ 386 ​ 465 ​ 976 ​ 11,604 ​ 12,580 ​ ​ $ 6,967 ​ $ 5,102 ​ $ 19,025 ​ $ 31,094 ​ $ 525,311 ​ $ 556,405
Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Summary of information pertaining to nonaccrual loans by class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Commercial non-owner occupied real estate: ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 299 ​ $ 424 ​ $ 423 ​ Commercial non-owner occupied ​ 481 ​ 831 ​ 1,109 ​ Total commercial non-owner occupied real estate ​ 780 ​ 1,255 ​ 1,532 ​ Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 6,688 ​ 7,109 ​ 6,465 ​ Home equity loans ​ 1,740 ​ 2,333 ​ 2,308 ​ Total consumer real estate ​ 8,428 ​ 9,442 ​ 8,773 ​ Commercial owner occupied real estate ​ 3,459 ​ 1,068 ​ 1,526 ​ Commercial and industrial ​ 285 ​ 647 ​ 811 ​ Other income producing property ​ 351 ​ 500 ​ 323 ​ Consumer ​ 1,351 ​ 1,267 ​ 893 ​ Restructured loans ​ 671 ​ 648 ​ 902 ​ Total loans on nonaccrual status ​ $ 15,325 ​ $ 14,827 ​ $ 14,760 ​
Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Summary of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) ​ 2019 ​ 2018 ​ 2018 ​ Acquired non-credit impaired loans: ​ ​ ​ Commercial non-owner occupied real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 60,391 ​ $ 165,070 ​ $ 281,282 ​ Commercial non-owner occupied ​ 595,367 ​ 679,253 ​ 752,465 ​ Total commercial non-owner occupied real estate ​ 655,758 ​ 844,323 ​ 1,033,747 ​ Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 577,284 ​ 628,813 ​ 676,596 ​ Home equity loans ​ 208,777 ​ 242,425 ​ 278,906 ​ Total consumer real estate ​ 786,061 ​ 871,238 ​ 955,502 ​ Commercial owner occupied real estate ​ 376,187 ​ 421,841 ​ 486,254 ​ Commercial and industrial ​ 151,579 ​ 212,537 ​ 304,864 ​ Other income producing property ​ 111,006 ​ 133,110 ​ 169,392 ​ Consumer ​ 99,690 ​ 111,777 ​ 126,665 ​ Acquired non-credit impaired loans ​ $ 2,180,281 ​ $ 2,594,826 ​ $ 3,076,424 ​
Schedule of changes in allowance for loan losses	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ ​ ​ Other Income ​ ​ ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ — ​ — ​ (786) ​ (6) ​ (168) ​ (506) ​ — ​ (69) ​ (1,535) ​ Recoveries ​ 1 ​ — ​ — ​ 3 ​ 24 ​ 6 ​ 71 ​ 11 ​ 116 ​ Provision (benefit) ​ (1) ​ — ​ 786 ​ 3 ​ 144 ​ 500 ​ (71) ​ 58 ​ 1,419 ​ Balance, June 30, 2019 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ 60,391 ​ 595,367 ​ 376,187 ​ 577,284 ​ 208,777 ​ 151,579 ​ 111,006 ​ 99,690 ​ 2,180,281 ​ Total acquired non-credit impaired loans ​ $ 60,391 ​ $ 595,367 ​ $ 376,187 ​ $ 577,284 ​ $ 208,777 ​ $ 151,579 ​ $ 111,006 ​ $ 99,690 ​ $ 2,180,281 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at beginning of period ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ (106) ​ — ​ (28) ​ — ​ (158) ​ (764) ​ — ​ (127) ​ (1,183) ​ Recoveries ​ 6 ​ — ​ — ​ 5 ​ 28 ​ 2 ​ — ​ 46 ​ 87 ​ Provision (benefit) ​ 100 ​ — ​ 28 ​ (5) ​ 130 ​ 762 ​ — ​ 81 ​ 1,096 ​ Balance, June 30, 2018 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans individually evaluated for impairment ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Loans collectively evaluated for impairment ​ 281,282 ​ 752,465 ​ 486,254 ​ 676,596 ​ 278,906 ​ 304,864 ​ 169,392 ​ 126,665 ​ 3,076,424 ​ Total acquired non-credit impaired loans ​ $ 281,282 ​ $ 752,465 ​ $ 486,254 ​ $ 676,596 ​ $ 278,906 ​ $ 304,864 ​ $ 169,392 ​ $ 126,665 ​ $ 3,076,424 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction Commercial Commercial Consumer ​ ​ Other Income ​ ​ ​ ​ & Land ​ Non-owner ​ Owner ​ Owner ​ Home ​ Commercial ​ Producing ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ Development ​ Occupied ​ Occupied ​ Occupied ​ Equity ​ & Industrial ​ Property ​ Consumer ​ Total Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2018 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ (6) ​ — ​ (786) ​ (6) ​ (240) ​ (640) ​ (26) ​ (205) ​ (1,909) ​ Recoveries ​ 2 ​ — ​ — ​ 5 ​ 46 ​ 171 ​ 71 ​ 27 ​ 322 ​ Provision (benefit) ​ 4 ​ — ​ 786 ​ 1 ​ 194 ​ 469 ​ (45) ​ 178 ​ 1,587 ​ Balance, June 30, 2019 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance, December 31, 2017 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ Charge-offs ​ (107) ​ — ​ (28) ​ (70) ​ (240) ​ (807) ​ — ​ (265) ​ (1,517) ​ Recoveries ​ 7 ​ — ​ — ​ 62 ​ 79 ​ 55 ​ — ​ 49 ​ 252 ​ Provision (benefit) ​ 100 ​ — ​ 28 ​ 8 ​ 161 ​ 752 ​ — ​ 216 ​ 1,265 ​ Balance, June 30, 2018 ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ $ — ​ ​
Schedule of credit risk profile by risk grade of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Acquired ​ ​ ​ Non-credit Impaired Loans ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Pass ​ $ 2,109,875 ​ $ 2,523,010 ​ $ 3,006,269 ​ Special mention ​ 41,016 ​ 48,716 ​ 46,650 ​ Substandard ​ 29,390 ​ 23,100 ​ 23,505 ​ Doubtful ​ — ​ — ​ — ​ ​ ​ $ 2,180,281 ​ $ 2,594,826 ​ $ 3,076,424 ​
Aging analysis of past due loans (includes nonaccrual loans), segregated by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30 - 59 Days 60 - 89 Days 90+ Days Total ​ ​ Total (Dollars in thousands) ​ Past Due ​ Past Due ​ Past Due ​ Past Due ​ Current ​ Loans June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 169 ​ $ 169 ​ $ 317 ​ $ 655 ​ $ 59,736 ​ $ 60,391 Commercial non-owner occupied ​ 640 ​ — ​ 265 ​ 905 ​ 594,462 ​ 595,367 Commercial owner occupied ​ 933 ​ 366 ​ 891 ​ 2,190 ​ 373,997 ​ 376,187 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 970 ​ — ​ 413 ​ 1,383 ​ 575,901 ​ 577,284 Home equity loans ​ 1,107 ​ 322 ​ 587 ​ 2,016 ​ 206,761 ​ 208,777 Commercial and industrial ​ 1,266 ​ 1,543 ​ 323 ​ 3,132 ​ 148,447 ​ 151,579 Other income producing property ​ 897 ​ 10 ​ 109 ​ 1,016 ​ 109,990 ​ 111,006 Consumer ​ 424 ​ 194 ​ 323 ​ 941 ​ 98,749 ​ 99,690 ​ ​ $ 6,406 ​ $ 2,604 ​ $ 3,228 ​ $ 12,238 ​ $ 2,168,043 ​ $ 2,180,281 December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 647 ​ $ 45 ​ $ 365 ​ $ 1,057 ​ $ 164,013 ​ $ 165,070 Commercial non-owner occupied ​ 607 ​ 21 ​ 283 ​ 911 ​ 678,342 ​ 679,253 Commercial owner occupied ​ 964 ​ 1,006 ​ — ​ 1,970 ​ 419,871 ​ 421,841 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 1,127 ​ 621 ​ 789 ​ 2,537 ​ 626,276 ​ 628,813 Home equity loans ​ 1,286 ​ 442 ​ 2,209 ​ 3,937 ​ 238,488 ​ 242,425 Commercial and industrial ​ 2,648 ​ 130 ​ 19 ​ 2,797 ​ 209,740 ​ 212,537 Other income producing property ​ 603 ​ 276 ​ 129 ​ 1,008 ​ 132,102 ​ 133,110 Consumer ​ 574 ​ 209 ​ 532 ​ 1,315 ​ 110,462 ​ 111,777 ​ ​ $ 8,456 ​ $ 2,750 ​ $ 4,326 ​ $ 15,532 ​ $ 2,579,294 ​ $ 2,594,826 June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 666 ​ $ 66 ​ $ 309 ​ $ 1,041 ​ $ 280,241 ​ $ 281,282 Commercial non-owner occupied ​ 2,936 ​ — ​ 157 ​ 3,093 ​ 749,372 ​ 752,465 Commercial owner occupied ​ 1,121 ​ 11 ​ 737 ​ 1,869 ​ 484,385 ​ 486,254 Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ 1,434 ​ 207 ​ 860 ​ 2,501 ​ 674,095 ​ 676,596 Home equity loans ​ 1,656 ​ 326 ​ 2,197 ​ 4,179 ​ 274,727 ​ 278,906 Commercial and industrial ​ 115 ​ 118 ​ 21 ​ 254 ​ 304,610 ​ 304,864 Other income producing property ​ 544 ​ 14 ​ 145 ​ 703 ​ 168,689 ​ 169,392 Consumer ​ 436 ​ 717 ​ 296 ​ 1,449 ​ 125,216 ​ 126,665 ​ ​ $ 8,908 ​ $ 1,459 ​ $ 4,722 ​ $ 15,089 ​ $ 3,061,335 ​ $ 3,076,424
Summary of information pertaining to nonaccrual loans by class	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 ​ Commercial non-owner occupied real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction and land development ​ $ 1,207 ​ $ 252 ​ $ 369 ​ Commercial non-owner occupied ​ ​ 277 ​ ​ 283 ​ ​ — ​ Total commercial non-owner occupied real estate ​ ​ 1,484 ​ ​ 535 ​ ​ 369 ​ Consumer real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer owner occupied ​ ​ 1,699 ​ ​ 3,864 ​ ​ 2,136 ​ Home equity loans ​ ​ 3,023 ​ ​ 4,512 ​ ​ 4,234 ​ Total consumer real estate ​ ​ 4,722 ​ ​ 8,376 ​ ​ 6,370 ​ Commercial owner occupied real estate ​ ​ 1,108 ​ ​ 1,470 ​ ​ 885 ​ Commercial and industrial ​ ​ 964 ​ ​ 1,296 ​ ​ 101 ​ Other income producing property ​ ​ 228 ​ ​ 244 ​ ​ 254 ​ Consumer ​ ​ 1,442 ​ ​ 1,568 ​ ​ 1,394 ​ Total loans on nonaccrual status ​ $ 9,948 ​ $ 13,489 ​ $ 9,373 ​
Acquired non-credit impaired loans | Commercial loans
Loans and Allowance for Loan Losses
Schedule of credit risk profile by risk grade of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction & Development ​ Occupied ​ Commercial Owner Occupied ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 58,165 ​ $ 163,777 ​ $ 279,239 ​ $ 583,416 ​ $ 665,913 ​ $ 738,293 ​ $ 359,783 ​ $ 411,783 ​ $ 479,399 ​ Special mention ​ 821 ​ 838 ​ 1,449 ​ 5,753 ​ 13,018 ​ 14,164 ​ 12,841 ​ 5,664 ​ 5,871 ​ Substandard ​ 1,405 ​ 455 ​ 594 ​ 6,198 ​ 322 ​ 8 ​ 3,563 ​ 4,394 ​ 984 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 60,391 ​ $ 165,070 ​ $ 281,282 ​ $ 595,367 ​ $ 679,253 ​ $ 752,465 ​ $ 376,187 ​ $ 421,841 ​ $ 486,254 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other Income Producing ​ ​ ​ ​ ​ Commercial & Industrial ​ Property ​ Commercial Total ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ ​ 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 145,733 ​ $ 202,399 ​ $ 291,755 ​ $ 103,325 ​ $ 125,399 ​ $ 165,188 ​ $ 1,250,422 ​ $ 1,569,271 ​ $ 1,953,874 ​ Special mention ​ 2,616 ​ 6,523 ​ 5,248 ​ 6,140 ​ 6,419 ​ 3,381 ​ 28,171 ​ 32,462 ​ 30,113 ​ Substandard ​ 3,230 ​ 3,615 ​ 7,861 ​ 1,541 ​ 1,292 ​ 823 ​ 15,937 ​ 10,078 ​ 10,270 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 151,579 ​ $ 212,537 ​ $ 304,864 ​ $ 111,006 ​ $ 133,110 ​ $ 169,392 ​ $ 1,294,530 ​ $ 1,611,811 ​ $ 1,994,257 ​
Acquired non-credit impaired loans | Consumer
Loans and Allowance for Loan Losses
Schedule of credit risk profile by risk grade of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer Owner Occupied ​ Home Equity ​ Consumer ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 2019 2018 2018 2019 2018 2018 Pass ​ $ 566,433 ​ $ 617,391 ​ $ 664,594 ​ $ 196,254 ​ $ 227,515 ​ $ 263,994 ​ $ 96,766 ​ $ 108,833 ​ $ 123,807 ​ Special mention ​ 6,749 ​ 7,868 ​ 7,495 ​ 5,459 ​ 7,688 ​ 8,319 ​ 637 ​ 698 ​ 723 ​ Substandard ​ 4,102 ​ 3,554 ​ 4,507 ​ 7,064 ​ 7,222 ​ 6,593 ​ 2,287 ​ 2,246 ​ 2,135 ​ Doubtful ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ — ​ ​ ​ $ 577,284 ​ $ 628,813 ​ $ 676,596 ​ $ 208,777 ​ $ 242,425 ​ $ 278,906 ​ $ 99,690 ​ $ 111,777 ​ $ 126,665 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consumer Total ​ ​ June 30, ​ December 31, ​ June 30, ​ ​ 2019 2018 2018 Pass $ 859,453 ​ $ 953,739 ​ $ 1,052,395 ​ Special mention 12,845 ​ 16,254 ​ 16,537 ​ Substandard 13,453 ​ 13,022 ​ 13,235 ​ Doubtful — ​ — ​ — ​ ​ $ 885,751 ​ $ 983,015 ​ $ 1,082,167 ​

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	6 Months Ended
	Jun. 30, 2019
Other Real Estate Owned
Schedule of information pertaining to OREO	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, ​ (Dollars in thousands) ​ 2019 ​ 2018 ​ Beginning balance ​ $ 11,410 ​ $ 11,203 ​ Acquired in PSC acquisition ​ — ​ 210 ​ Additions ​ 7,632 ​ 10,259 ​ Writedowns ​ (487) ​ (932) ​ Sold ​ (4,049) ​ (3,518) ​ Ending Balance ​ $ 14,506 ​ $ 17,222 ​

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases
Schedule of information pertaining to operating leases	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ (Dollars in thousands) ​ June 30, ​ June 30, ​ ​ 2019 2019 Lease Expense Components: ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease expense ​ $ 2,173 ​ ​ $ 4,319 ​ ​ Short-term lease expense ​ ​ 132 ​ ​ ​ 276 ​ ​ Variable lease expense ​ 117 ​ ​ 186 ​ ​ Total lease expense ​ $ 2,422 ​ ​ $ 4,781 ​ ​ Supplemental Cash Flow and Other Information Related to Leases: ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for amounts included in the measurement of lease liabilities - operating leases ​ $ 1,918 ​ ​ $ 3,808 ​ ​ Initial ROU assets recorded in exchange for new lease liabilities - operating leases ​ $ 2,994 ​ ​ $ 4,950 ​ ​ Weighted - average remaining lease term (years) - operating leases ​ ​ ​ ​ ​ 14.40 ​ ​ Weighted - average discount rate - operating leases ​ ​ ​ ​ 4.0% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ ​ ​ ​ ​ ​ ​ 2019 ​ Supplemental Balance Sheet Information Related to Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease ROU assets (premises and equipment) ​ ​ ​ ​ ​ $ 84,464 ​ ​ Operating lease liabilities (other liabilities) ​ ​ ​ ​ ​ $ 84,968 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Maturity Analysis of Lease Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ending December 31, ​ ​ ​ ​ ​ ​ ​ ​ ​ 2019 (excluding the six months ended June 30, 2019) ​ ​ ​ ​ ​ $ 3,796 ​ ​ 2020 ​ ​ ​ ​ ​ ​ 7,531 ​ ​ 2021 ​ ​ ​ ​ ​ ​ 7,989 ​ ​ 2022 ​ ​ ​ ​ ​ ​ 8,007 ​ ​ 2023 ​ ​ ​ ​ ​ ​ 8,021 ​ ​ Thereafter ​ ​ ​ ​ ​ ​ 78,176 ​ ​ Total ​ ​ ​ ​ ​ ​ 113,520 ​ ​ Less: Imputed Interest ​ ​ ​ ​ ​ ​ (28,552) ​ ​ Lease Liability ​ ​ ​ ​ ​ $ 84,968 ​ ​

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2019
Deposits
Schedule of total deposits	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, (Dollars in thousands) 2019 2018 2018 Certificates of deposit ​ $ 1,732,554 ​ $ 1,775,095 ​ $ 1,804,657 Interest-bearing demand deposits ​ 5,588,061 ​ 5,407,175 ​ 5,216,942 Non-interest bearing demand deposits ​ 3,255,906 ​ 3,061,769 ​ 3,152,828 Savings deposits ​ 1,339,293 ​ 1,399,815 ​ 1,458,208 Other time deposits ​ 6,466 ​ 3,079 ​ 5,654 Total deposits ​ $ 11,922,280 ​ $ 11,646,933 ​ $ 11,638,289

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share
Schedule of computation of basic and diluted earnings per share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Six Months Ended ​ ​ ​ June 30, ​ June 30, ​ (Dollars and shares in thousands, except for per share amounts) 2019 2018 2019 2018 Basic earnings per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 41,460 ​ $ 40,459 ​ $ 85,827 ​ $ 82,785 ​ Weighted-average basic common shares ​ ​ 35,089 ​ ​ 36,677 ​ ​ 35,268 ​ ​ 36,657 ​ Basic earnings per common share ​ $ 1.18 ​ $ 1.10 ​ $ 2.43 ​ $ 2.25 ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 41,460 ​ $ 40,459 ​ $ 85,827 ​ $ 82,785 ​ Weighted-average basic common shares ​ ​ 35,089 ​ ​ 36,677 ​ ​ 35,268 ​ ​ 36,657 ​ Effect of dilutive securities ​ ​ 211 ​ ​ 252 ​ ​ 193 ​ ​ 253 ​ Weighted-average dilutive shares ​ ​ 35,300 ​ ​ 36,929 ​ ​ 35,461 ​ ​ 36,910 ​ Diluted earnings per common share ​ $ 1.17 ​ $ 1.09 ​ $ 2.42 ​ $ 2.24 ​
Schedule of anti-dilutive securities excluded from computation of diluted earnings per common share	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six Months Ended June 30, ​ (Dollars in thousands) 2019 2018 2019 2018 Number of shares ​ ​ ​ ​ ​ 63,313 ​ ​ ​ ​ ​ 61,272 ​ ​ ​ ​ 63,313 ​ ​ ​ ​ ​ 61,272 ​ Range of exercise prices ​ $ 69.48 to $ 91.35 ​ $ 91.05 to $ 91.35 ​ $ 69.48 to $ 91.35 ​ $ 91.05 to $ 91.35 ​ ​

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Share-Based Compensation
Schedule of stock option activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ Weighted ​ Average ​ Aggregate ​ ​ ​ ​ ​ Average ​ Remaining ​ Intrinsic ​ ​ Shares Price (Yrs.) (000's) Outstanding at January 1, 2019 ​ 213,866 ​ $ 61.28 ​ ​ ​ ​ ​ ​ Granted ​ — ​ — ​ ​ ​ ​ ​ Exercised ​ (12,722) ​ 31.62 ​ ​ ​ ​ ​ Outstanding at June 30, 2019 ​ 201,144 ​ 63.16 ​ 5.39 ​ $ 3,201 ​ Exercisable at June 30, 2019 ​ 155,472 ​ ​ 56.07 ​ 4.63 ​ $ 3,137 ​ Weighted-average fair value of options granted during the year ​ $0.00 ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of weighted-average assumptions used in valuing options	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six months ended June 30, ​ 2019 2018 Dividend yield ​ — % ​ 1.46 % Expected life — years ​ 8.5 years Expected volatility — % 28.0 % Risk-free interest rate — % 2.54 %
Summary of nonvested restricted stock	Nonvested restricted stock for the six months ended June 30, 2019 is summarized in the following table. All information has been retroactively adjusted for stock dividends and stock splits. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted- ​ ​ ​ ​ Average ​ ​ ​ ​ Grant-Date Restricted Stock ​ Shares ​ Fair Value Nonvested at January 1, 2019 104,419 ​ $ 62.45 ​ Granted 8,934 ​ 73.34 ​ Vested (26,514) ​ 74.29 ​ Forfeited (2,332) ​ 73.89 ​ Nonvested at June 30, 2019 84,507 ​ 59.57 ​
Summary of nonvested RSUs	Nonvested RSUs for the six months ended June 30, 2019 is summarized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted- ​ ​ ​ ​ Average ​ ​ ​ ​ Grant-Date Restricted Stock Units ​ Shares ​ Fair Value Nonvested at January 1, 2019 200,540 ​ $ 85.10 ​ Granted 152,564 ​ 67.83 ​ Forfeited ​ (1,651) ​ ​ 89.43 ​ Nonvested at June 30, 2019 351,453 ​ 77.58 ​

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value
Schedule of recorded amount of assets and liabilities measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs (Dollars in thousands) ​ Fair Value ​ (Level 1) ​ (Level 2) ​ (Level 3) June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 17,587 ​ $ — ​ $ 17,587 ​ $ — Loans held for sale ​ 47,796 ​ — ​ 47,796 ​ — Securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ ​ 66,529 ​ ​ — ​ ​ 66,529 ​ ​ — State and municipal obligations ​ 182,146 ​ — ​ 182,146 ​ — Mortgage-backed securities ​ 1,468,601 ​ — ​ 1,468,601 ​ — Total securities available for sale ​ 1,717,276 ​ — ​ 1,717,276 ​ — Mortgage servicing rights ​ 30,332 ​ — ​ — ​ 30,332 ​ ​ $ 1,812,991 ​ $ — ​ $ 1,782,659 ​ $ 30,332 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 30,286 ​ $ — ​ $ 30,286 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 5,090 ​ $ — ​ $ 5,090 ​ $ — Loans held for sale ​ 22,925 ​ — ​ 22,925 ​ — Securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ ​ 48,251 ​ ​ — ​ ​ 48,251 ​ ​ — State and municipal obligations ​ 200,768 ​ — ​ 200,768 ​ — Mortgage-backed securities ​ 1,268,048 ​ — ​ 1,268,048 ​ — Total securities available for sale ​ 1,517,067 ​ — ​ 1,517,067 ​ — Mortgage servicing rights ​ 34,727 ​ — ​ — ​ 34,727 ​ ​ $ 1,579,809 ​ $ — ​ $ 1,545,082 ​ $ 34,727 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 4,421 ​ $ — ​ $ 4,421 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 8,848 ​ $ — ​ $ 8,848 ​ $ — Loans held for sale ​ 36,968 ​ — ​ 36,968 ​ — Securities available for sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Government-sponsored entities debt ​ ​ 47,613 ​ ​ — ​ ​ 47,613 ​ ​ — State and municipal obligations ​ 223,816 ​ — ​ 223,816 ​ — Mortgage-backed securities ​ 1,306,570 ​ — ​ 1,306,570 ​ — Total securities available for sale ​ 1,577,999 ​ — ​ 1,577,999 ​ — Mortgage servicing rights ​ 35,107 ​ — ​ — ​ 35,107 ​ ​ $ 1,658,922 ​ $ — ​ $ 1,623,815 ​ $ 35,107 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivative financial instruments ​ $ 8,097 ​ $ — ​ $ 8,097 ​ $ —
Schedule of reconciliation of the beginning and ending balances of Level 3 assets and liabilities recorded at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) Assets Liabilities Fair value, January 1, 2019 ​ $ 34,727 ​ $ — ​ Servicing assets that resulted from transfers of financial assets ​ 2,558 ​ — ​ Changes in fair value due to valuation inputs or assumptions ​ (4,924) ​ — ​ Changes in fair value due to decay ​ (2,029) ​ — ​ Fair value , June 30, 2019 ​ $ 30,332 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value, January 1, 2018 ​ $ 31,119 ​ $ — ​ Servicing assets that resulted from transfers of financial assets ​ 3,112 ​ — ​ Changes in fair value due to valuation inputs or assumptions ​ ​ 2,945 ​ ​ — ​ Changes in fair value due to decay ​ (2,069) ​ — ​ Fair value, June 30, 2018 ​ $ 35,107 ​ $ — ​
Schedule of amounts of assets and liabilities measured at fair value on a nonrecurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Quoted Prices ​ ​ ​ ​ ​ ​ ​ ​ ​ In Active ​ Significant ​ ​ ​ ​ ​ ​ ​ ​ Markets ​ Other ​ Significant ​ ​ ​ ​ ​ for Identical ​ Observable ​ Unobservable ​ ​ ​ ​ ​ Assets ​ Inputs ​ Inputs (Dollars in thousands) ​ Fair Value ​ (Level 1) ​ (Level 2) ​ (Level 3) June 30, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OREO ​ $ 14,506 ​ $ — ​ $ — ​ $ 14,506 ​ Non-acquired impaired loans ​ 4,946 ​ — ​ — ​ 4,946 ​ December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OREO ​ $ 11,410 ​ $ — ​ $ — ​ $ 11,410 ​ Non-acquired impaired loans ​ 13,164 ​ — ​ — ​ 13,164 ​ June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ OREO ​ $ 17,222 ​ $ — ​ $ — ​ $ 17,222 ​ Non-acquired impaired loans ​ 5,909 ​ — ​ — ​ 5,909 ​
Quantitative Information about Level 3 Fair Value Measurements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Average ​ ​ ​ ​ ​ ​ June 30, ​ December 31, June 30, ​ ​ Valuation Technique Unobservable Input 2019 2018 2018 Nonrecurring measurements: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Non-acquired impaired loans Discounted appraisals Collateral discounts ​ 3 % ​ 3 % 3 % OREO Discounted appraisals Collateral discounts and estimated costs to sell ​ 22 % ​ 23 % 17 %
Schedule of estimated fair value, and related carrying amount, of the Company's financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying Fair ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ Amount ​ Value ​ Level 1 ​ Level 2 ​ Level 3 June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 851,971 ​ $ 851,971 ​ $ 851,971 ​ $ — ​ $ — ​ Investment securities ​ 1,766,400 ​ 1,766,400 ​ 49,124 ​ 1,717,276 ​ — ​ Loans held for sale ​ ​ 47,796 ​ ​ 47,796 ​ ​ — ​ ​ 47,796 ​ ​ — ​ Loans, net of allowance for loan losses ​ 11,167,979 ​ 11,278,624 ​ — ​ — ​ 11,278,624 ​ Accrued interest receivable ​ 38,650 ​ 38,650 ​ — ​ 7,880 ​ 30,770 ​ Mortgage servicing rights ​ 30,332 ​ 30,332 ​ — ​ — ​ 30,332 ​ Interest rate swap - non-designated hedge ​ 14,561 ​ 14,561 ​ — ​ 14,561 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ 3,026 ​ 3,026 ​ — ​ 3,026 ​ — ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 11,922,280 ​ 11,124,796 ​ — ​ 11,124,796 ​ — ​ Federal funds purchased and securities sold under agreements to repurchase ​ 298,029 ​ 298,029 ​ — ​ 298,029 ​ — ​ Other borrowings ​ 816,414 ​ 819,306 ​ — ​ 819,306 ​ — ​ Accrued interest payable ​ 6,168 ​ 6,168 ​ — ​ 6,168 ​ — ​ Interest rate swap - non-designated hedge ​ 15,952 ​ 15,952 ​ — ​ 15,952 ​ — ​ Interest rate swap - cash flow hedge ​ 14,334 ​ 14,334 ​ — ​ 14,334 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ — ​ — ​ — ​ — ​ — ​ Off balance sheet financial instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to extend credit ​ — ​ 27,579 ​ — ​ 27,579 ​ — ​ December 31, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 408,983 ​ $ 408,983 ​ $ 408,983 ​ $ — ​ $ — ​ Investment securities ​ 1,542,671 ​ 1,542,671 ​ 25,604 ​ 1,517,067 ​ — ​ Loans held for sale ​ ​ 22,925 ​ ​ 22,925 ​ ​ — ​ ​ 22,925 ​ ​ — ​ Loans, net of allowance for loan losses ​ 10,962,037 ​ 10,613,571 ​ — ​ — ​ 10,613,571 ​ Accrued interest receivable ​ 35,997 ​ 35,997 ​ — ​ 6,908 ​ 29,089 ​ Mortgage servicing rights ​ 34,727 ​ 34,727 ​ — ​ — ​ 34,727 ​ Interest rate swap - non-designated hedge ​ 3,824 ​ 3,824 ​ — ​ 3,824 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ 1,267 ​ 1,267 ​ — ​ 1,267 ​ — ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 11,646,933 ​ 10,561,394 ​ — ​ 10,561,394 ​ — ​ Federal funds purchased and securities sold under agreements to repurchase ​ 270,649 ​ 270,649 ​ — ​ 270,649 ​ — ​ Other borrowings ​ 266,084 ​ 269,134 ​ — ​ 269,134 ​ — ​ Accrued interest payable ​ 4,719 ​ 4,719 ​ — ​ 4,719 ​ — ​ Interest rate swap - non-designated hedge ​ 4,373 ​ 4,373 ​ — ​ 4,373 ​ — ​ Interest rate swap - cash flow hedge ​ 48 ​ 48 ​ — ​ 48 ​ — ​ Off balance sheet financial instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to extend credit ​ ​ — ​ (88,424) ​ — ​ (88,424) ​ — ​ June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 396,849 ​ $ 396,849 ​ $ 396,849 ​ $ — ​ $ — ​ Investment securities ​ 1,597,727 ​ 1,597,731 ​ 19,229 ​ 1,578,502 ​ — ​ Loans held for sale ​ ​ 36,968 ​ ​ 36,968 ​ ​ — ​ ​ 36,968 ​ ​ — ​ Loans, net of allowance for loan losses ​ 10,778,068 ​ 10,547,778 ​ — ​ — ​ 10,547,778 ​ Accrued interest receivable ​ 33,751 ​ 33,751 ​ — ​ 7,333 ​ 26,418 ​ Mortgage servicing rights ​ 35,107 ​ 35,107 ​ — ​ — ​ 35,107 ​ Interest rate swap - non-designated hedge ​ 7,750 ​ 7,750 ​ — ​ 7,750 ​ — ​ Other derivative financial instruments (mortgage banking related) ​ 1,098 ​ 1,098 ​ — ​ 1,098 ​ — ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposits ​ 11,638,289 ​ 10,675,705 ​ — ​ 10,675,705 ​ — ​ Federal funds purchased and securities sold under agreements to repurchase ​ 331,969 ​ 331,969 ​ — ​ 331,969 ​ — ​ Other borrowings ​ 115,754 ​ 119,221 ​ — ​ 119,221 ​ — ​ Accrued interest payable ​ 3,882 ​ 3,882 ​ — ​ 3,882 ​ — ​ Interest rate swap - cash flow hedge ​ 116 ​ 116 ​ — ​ 116 ​ — ​ Interest rate swap - non-designated hedge ​ 7,981 ​ 7,981 ​ — ​ 7,981 ​ — ​ Off balance sheet financial instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commitments to extend credit ​ ​ — ​ (62,060) ​ — ​ (62,060) ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss)
Schedule of components of accumulated other comprehensive income (loss)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unrealized Gains ​ ​ ​ ​ ​ ​ ​ ​ ​ and Losses ​ Gains and ​ ​ ​ ​ ​ ​ ​ ​ on Securities ​ Losses on ​ ​ ​ ​ ​ Benefit ​ Available ​ Cash Flow ​ ​ ​ (Dollars in thousands) ​ Plans ​ for Sale ​ Hedges ​ Total Three Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at March 31, 2019 ​ $ (6,355) ​ $ (4,906) ​ $ (2,113) ​ $ (13,374) Other comprehensive gain (loss) before reclassifications ​ — ​ 19,183 ​ (8,795) ​ 10,388 Amounts reclassified from accumulated other comprehensive income (loss) ​ 6,058 ​ (1,333) ​ (273) ​ 4,452 Net comprehensive income (loss) ​ 6,058 ​ 17,850 ​ (9,068) ​ 14,840 Balance at June 30, 2019 ​ $ (297) ​ $ 12,944 ​ $ (11,181) ​ $ 1,466 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at March 31, 2018 ​ $ (7,607) ​ $ (22,617) ​ $ (126) ​ $ (30,350) Other comprehensive income (loss) before reclassifications ​ — ​ (6,409) ​ 6 ​ ​ (6,403) Amounts reclassified from accumulated other comprehensive income ​ 151 ​ 500 ​ 31 ​ 682 Net comprehensive income (loss) ​ 151 ​ (5,909) ​ 37 ​ (5,721) Balance at June 30, 2018 ​ $ (7,456) ​ $ (28,526) ​ $ (89) ​ $ (36,071) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2018 ​ $ (6,450) ​ $ (18,394) ​ $ (37) ​ $ (24,881) Other comprehensive income (loss) before reclassifications ​ ​ — ​ ​ 33,092 ​ ​ (10,876) ​ ​ 22,216 Amounts reclassified from accumulated other comprehensive income (loss) ​ 6,153 ​ (1,754) ​ (268) ​ 4,131 Net comprehensive income (loss) ​ 6,153 ​ 31,338 ​ (11,144) ​ 26,347 Balance at June 30, 2019 ​ $ (297) ​ $ 12,944 ​ $ (11,181) ​ $ 1,466 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2018 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance at December 31, 2017 ​ $ (5,998) ​ $ (4,278) ​ $ (151) ​ $ (10,427) Other comprehensive income (loss) before reclassifications ​ — ​ (23,601) ​ 34 ​ (23,567) Amounts reclassified from accumulated other comprehensive income ​ 302 ​ 500 ​ 68 ​ 870 Net comprehensive income (loss) ​ 302 ​ (23,101) ​ 102 ​ (22,697) AOCI reclassification to retained earnings from the adoption of ASU 2018-02 ​ ​ (1,760) ​ (1,147) ​ (40) ​ (2,947) Balance at June 30, 2018 ​ $ (7,456) ​ $ (28,526) ​ $ (89) ​ $ (36,071)
Schedule of reclassifications out of accumulated other comprehensive income (loss), net of tax	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount Reclassified from Accumulated Other Comprehensive Income (Loss) ​ ​ (Dollars in thousands) ​ For the Three Months Ended June 30, ​ For the Six Months Ended June 30, ​ ​ Accumulated Other Comprehensive Income (Loss) Component 2019 2018 2019 2018 Income Statement Gains (losses) on cash flow hedges: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate contracts ​ $ (350) ​ $ 39 ​ $ (343) ​ $ 87 ​ Interest expense ​ ​ ​ 77 ​ ​ (8) ​ 75 ​ ​ (19) ​ Provision for income taxes ​ ​ ​ (273) ​ ​ 31 ​ (268) ​ ​ 68 ​ Net income (Gains) losses on sales of available for sale securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ (1,709) ​ $ 641 ​ $ (2,250) ​ $ 641 ​ Securities gains (losses), net ​ ​ ​ 376 ​ ​ (141) ​ ​ 496 ​ ​ (141) ​ Provision for income taxes ​ ​ ​ (1,333) ​ ​ 500 ​ ​ (1,754) ​ ​ 500 ​ Net income Losses and amortization of defined benefit pension: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Actuarial losses ​ $ 7,767 ​ $ 194 ​ $ 7,888 ​ $ 387 ​ Salaries and employee benefits ​ ​ ​ (1,709) ​ ​ (43) ​ (1,735) ​ ​ (85) ​ Provision for income taxes ​ ​ ​ 6,058 ​ ​ 151 ​ 6,153 ​ ​ 302 ​ Net income Total reclassifications for the period ​ $ 4,452 ​ $ 682 ​ $ 4,131 ​ $ 870 ​ ​ ​

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Financial Instruments
Derivative financial instruments summary	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2019 ​ ​ ​ ​ June 30, 2018 ​ ​ Balance Sheet ​ Notional ​ Estimated Fair Value ​ Notional ​ Estimated Fair Value (Dollars in thousands) Location Amount Gain Loss Amount Gain Loss ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flow hedges of interest rate risk on Junior Subordinated Debt: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pay fixed rate swap with counterparty ​ Other Liabilities ​ $ — ​ $ — ​ $ — ​ $ 8,000 ​ $ — ​ $ 116 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash flow hedges of interest rate risk on FHLB Advances: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pay fixed rate swap with counterparty ​ Other Liabilities ​ $ 700,000 ​ $ — ​ $ 14,334 ​ $ — ​ $ — ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair value hedge of interest rate risk: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pay fixed rate swap with counterparty ​ Other Assets ​ $ 2,784 ​ $ — ​ $ 197 ​ $ 2,824 ​ $ 8 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Not designated hedges of interest rate risk: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer related interest rate contracts: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Matched interest rate swaps with borrowers ​ Other Assets and Other Liabilities ​ $ 432,963 ​ $ 14,561 ​ $ 478 ​ $ 327,027 ​ $ 437 ​ $ 7,947 Matched interest rate swaps with counterparty ​ Other Assets and Other Liabilities ​ $ 432,963 ​ $ — ​ $ 15,277 ​ $ 327,027 ​ $ 7,271 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Not designated hedges of interest rate risk: Foreign Exchange ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Matched foreign exchange swaps with borrower ​ Other Assets ​ $ — ​ $ — ​ $ — ​ $ 2,521 ​ $ — ​ $ 34 Matched foreign exchange swaps with counterparty ​ Other Liabilities ​ $ — ​ $ — ​ $ — ​ $ 2,521 ​ $ 34 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Not designated hedges of interest rate risk - mortgage banking activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Contracts used to hedge mortgage servicing rights ​ Other Assets ​ $ 139,500 ​ $ 1,834 ​ $ — ​ $ 63,500 ​ $ 291 ​ $ — Forward sales commitments used to hedge mortgage pipeline ​ Other Assets ​ $ 93,949 ​ $ 1,192 ​ $ — ​ $ 92,584 ​ ​ 807 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total derivatives ​ ​ ​ $ 1,802,159 ​ $ 17,587 ​ $ 30,286 ​ $ 826,004 ​ $ 8,848 ​ $ 8,097
Schedule of notional value of forward sale commitments and the fair value of those obligations along with the fair value of the mortgage pipeline	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) June 30, 2019 December 31, 2018 June 30, 2018 Mortgage loan pipeline ​ $ 117,144 ​ $ 50,442 ​ $ 89,085 Expected closures ​ 87,858 ​ 37,832 ​ 66,813 Fair value of mortgage loan pipeline commitments ​ 1,878 ​ 705 ​ 1,159 Forward sales commitments ​ 93,949 ​ 54,533 ​ 92,584 Fair value of forward commitments ​ (686) ​ (621) ​ (352) ​

Capital Ratios (Tables)

Capital Ratios (Tables)	6 Months Ended
	Jun. 30, 2019
Capital Ratios
Schedule of actual and required capital ratios	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Minimum Capital Required to be ​ ​ ​ ​ ​ ​ ​ Required - Basel III ​ Required - Basel III Considered Well ​ ​ Actual ​ Phase-In Schedule ​ Fully Phased In ​ Capitalized ​ (Dollars in thousands) Amount Ratio Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio June 30, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 1,323,535 11.58 % $ 800,109 7.00 % $ 800,109 ​ 7.00 % $ 742,959 6.50 % South State Bank (the Bank) ​ 1,419,395 12.42 % 800,123 7.00 % 800,123 ​ 7.00 % 742,971 6.50 % Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,435,471 12.56 % 971,561 8.50 % 971,561 ​ 8.50 % 914,411 8.00 % South State Bank (the Bank) ​ 1,419,395 12.42 % 971,578 8.50 % 971,578 ​ 8.50 % 914,426 8.00 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,494,019 13.07 % 1,200,164 10.50 % 1,200,164 ​ 10.50 % 1,143,013 10.00 % South State Bank (the Bank) ​ 1,477,943 12.93 % 1,200,184 10.50 % 1,200,184 ​ 10.50 % 1,143,033 10.00 % Tier 1 capital to average assets (leverage ratio): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,435,471 9.99 % 574,940 4.00 % 574,940 ​ 4.00 % 718,675 5.00 % South State Bank (the Bank) ​ 1,419,395 9.88 % 574,780 4.00 % 574,780 ​ 4.00 % 718,475 5.00 % December 31, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 1,335,826 12.05 % $ 706,981 6.38 % $ 776,293 ​ 7.00 % $ 720,844 6.50 % South State Bank (the Bank) ​ 1,427,764 12.87 % 707,039 6.38 % 776,356 ​ 7.00 % 720,902 6.50 % Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,447,428 13.05 % 873,330 7.88 % 942,642 ​ 8.50 % 887,192 8.00 % South State Bank (the Bank) ​ 1,427,764 12.87 % 873,401 7.88 % 942,718 ​ 8.50 % 887,264 8.00 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,503,561 13.56 % 1,095,128 9.88 % 1,164,440 ​ 10.50 % 1,108,990 10.00 % South State Bank (the Bank) ​ 1,483,897 13.38 % 1,095,217 9.88 % 1,164,534 ​ 10.50 % 1,109,080 10.00 % Tier 1 capital to average assets (leverage ratio): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,447,428 10.65 % 543,506 4.00 % 543,506 ​ 4.00 % 679,383 5.00 % South State Bank (the Bank) ​ 1,427,764 10.51 % 543,387 4.00 % 543,387 ​ 4.00 % 679,234 5.00 % June 30, 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity Tier 1 to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 1,324,901 12.00 % $ 704,261 6.38 % $ 773,306 ​ 7.00 % $ 718,070 6.50 % South State Bank (the Bank) ​ 1,413,812 12.80 % 704,275 6.38 % 773,321 ​ 7.00 % 718,084 6.50 % Tier 1 capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,436,170 13.00 % 869,970 7.88 % 939,015 ​ 8.50 % 883,779 8.00 % South State Bank (the Bank) ​ 1,413,812 12.80 % 869,986 7.88 % 939,033 ​ 8.50 % 883,796 8.00 % Total capital to risk-weighted assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,488,805 13.48 % 1,090,914 9.88 % 1,159,960 ​ 10.50 % 1,104,723 10.00 % South State Bank (the Bank) ​ 1,466,447 13.27 % 1,090,935 9.88 % 1,159,982 ​ 10.50 % 1,104,745 10.00 % Tier 1 capital to average assets (leverage ratio): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 1,436,170 10.62 % 540,869 4.00 % 540,869 ​ 4.00 % 676,086 5.00 % South State Bank (the Bank) ​ 1,413,812 10.46 % 540,726 4.00 % 540,726 ​ 4.00 % 675,907 5.00 % ​

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill and Other Intangible Assets
Summary of gross carrying amounts and accumulated amortization of other intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ December 31, ​ June 30, ​ (Dollars in thousands) 2019 2018 2018 Gross carrying amount ​ $ 119,501 ​ $ 121,736 ​ $ 121,736 ​ Accumulated amortization ​ (63,150) ​ (58,836) ​ (51,761) ​ ​ ​ $ 56,351 ​ $ 62,900 ​ $ 69,975 ​
Schedule of estimated amortization expense for other intangibles for each of the next five quarters	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Dollars in thousands) ​ ​ ​ ​ Quarter ending: ​ September 30, 2019 ​ $ 3,268 ​ December 31, 2019 ​ 3,267 ​ March 31, 2020 ​ 3,007 ​ June 30, 2020 ​ 2,995 ​ September 30, 2020 ​ ​ 2,945 ​ Thereafter ​ 40,869 ​ ​ ​ $ 56,351 ​ ​

Loan Servicing, Mortgage Orig_2

Loan Servicing, Mortgage Origination, and Loans Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2019
Loan Servicing, Mortgage Origination, and Loans Held for Sale
Summary of changes in the fair value of MSRs and its offsetting hedge	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended Six Months Ended ​ (Dollars in thousands) June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Increase (decrease) in fair value of MSRs ​ $ (2,568) ​ $ 429 ​ $ (4,924) ​ $ 2,945 ​ Decay of MSRs ​ (1,143) ​ (1,141) ​ (2,029) ​ (2,069) ​ Gain (loss) related to derivatives ​ ​ 2,659 ​ ​ (339) ​ ​ 3,940 ​ ​ (1,893) ​ Net effect on statements of income ​ $ (1,052) ​ $ (1,051) ​ $ (3,013) ​ $ (1,017) ​
Schedule of characteristics and sensitivity analysis of the MSR	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, ​ ​ December 31, ​ ​ June 30, (Dollars in thousands) 2019 2018 2018 ​ Composition of residential loans serviced for others ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fixed-rate mortgage loans ​ ​ 99.8 % ​ ​ 99.8 % ​ ​ 99.7 % Adjustable-rate mortgage loans ​ ​ 0.2 % ​ ​ 0.2 % ​ ​ 0.3 % Total ​ ​ 100.0 % ​ ​ 100.0 % ​ ​ 100.0 % Weighted average life ​ ​ 6.54 years ​ ​ 7.88 years ​ ​ 8.56 years Constant Prepayment rate (CPR) ​ ​ 10.1 % ​ ​ 7.3 % ​ ​ 6.1 % Weighted average discount rate ​ ​ 9.4 % ​ ​ 9.4 % ​ ​ 9.4 % Effect on fair value due to change in interest rates ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 25 basis point increase ​ $ 2,517 ​ ​ $ 1,504 ​ ​ $ 934 ​ 50 basis point increase ​ ​ 4,621 ​ ​ ​ 2,740 ​ ​ 1,626 ​ 25 basis point decrease ​ ​ (2,575) ​ ​ ​ (1,981) ​ ​ (1,379) ​ 50 basis point decrease ​ ​ (5,540) ​ ​ ​ (4,421) ​ ​ (3,112) ​

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
Summary of Significant Accounting Policies
Renewal term	24 years
Existence of option to extend	true
Right to use asset	$ 84,464
Lease liabilities	$ 84,968
Maximum
Summary of Significant Accounting Policies
Renewal term	25 years
Adjustments | ASU 2016- 02
Summary of Significant Accounting Policies
Right to use asset		$ 82,200
Lease liabilities		$ 82,200

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Revenue from Contracts with Customers (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)contract	Jun. 30, 2018USD ($)contract
Summary of Significant Accounting Policies
Number of active contracts | contract			779,000	803,000
Transferred at Point in Time
Summary of Significant Accounting Policies
Revenue from contract with customers	$ 25,600	$ 29,900	$ 49,700	$ 60,700
Transferred over Time
Summary of Significant Accounting Policies
Revenue from contract with customers	5,000	4,900	10,000	9,800
Trust and investment services income
Summary of Significant Accounting Policies
Revenue from contract with customers	7,720	7,567	14,989	15,081
Deposit account services
Summary of Significant Accounting Policies
Revenue from contract with customers	$ 19,000	$ 22,900	$ 37,000	$ 45,700

Recent Accounting and Regulat_2

Recent Accounting and Regulatory Pronouncements (Details)	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)loan	Mar. 31, 2018USD ($)	Jun. 30, 2019USD ($)loan	Jan. 01, 2019USD ($)
Right to use asset	$ 84,464,000		$ 84,464,000
Lease liabilities	$ 84,968,000		$ 84,968,000
Number of loan segments | loan	9		9
Historical losses term	10 years
Software
Capitalized implementation costs			$ 35,614
ASU 2018- 02 | Early adoption
Reclassified to retained earnings from AOCI		$ 2,900,000
ASU 2016- 02 | Adjustments
Right to use asset				$ 82,200,000
Lease liabilities				$ 82,200,000

Investment Securities - Amortiz

Investment Securities - Amortized cost and fair value for held to maturity securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Investment securities held to maturity
Amortized Cost			$ 499
Fair Value	$ 0	$ 0	503
State and municipal obligations
Investment securities held to maturity
Amortized Cost			499
Gross Unrealized Gains			4
Fair Value			$ 503

Investment Securities - Amort_2

Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Investment securities available for sale
Amortized cost	$ 1,700,681	$ 1,540,650	$ 1,614,571
Gross Unrealized Gains	19,530	2,427	2,042
Gross Unrealized Losses	(2,935)	(26,010)	(38,614)
Fair Value	1,717,276	1,517,067	1,577,999
Government-sponsored entities debt
Investment securities available for sale
Amortized cost	65,604	48,982	48,933
Gross Unrealized Gains	933	21
Gross Unrealized Losses	(8)	(752)	(1,320)
Fair Value	66,529	48,251	47,613
State and municipal obligations
Investment securities available for sale
Amortized cost	177,533	200,184	223,533
Gross Unrealized Gains	4,614	1,709	1,932
Gross Unrealized Losses	(1)	(1,125)	(1,649)
Fair Value	182,146	200,768	223,816
Mortgage-backed securities
Investment securities available for sale
Amortized cost	1,457,544	1,291,484	1,342,105
Gross Unrealized Gains	13,983	697	110
Gross Unrealized Losses	(2,926)	(24,133)	(35,645)
Fair Value	1,468,601	1,268,048	1,306,570
Mortgage-backed securities issued by private label holdings
Investment securities available for sale
Fair Value	$ 0	$ 0	$ 0

Investment Securities - Amort_3

Investment Securities - Amortized cost and carrying value of other investment securities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Other investment securities
Carrying Value	$ 49,124	$ 19,229	$ 25,604
Amortized Cost
Due in one year or less	11,037
Due after one year through five years	52,053
Due after five years through ten years	402,345
Due after ten years	1,235,246
Fair Value	1,700,681	1,614,571	1,540,650
Fair Value
Due in one year or less	11,038
Due after one year through five years	52,764
Due after five years through ten years	408,027
Due after ten years	1,245,447
Fair Value	1,717,276	1,577,999	1,517,067
Information with respect to sales of available-for-sale securities
Sale proceeds	189,327	51,822
Amortized Cost
Total		499
Fair Value
Fair Value	0	503	0
Investment in Federal Home Loan Bank Stock
Other investment securities
Carrying Value	43,044	13,149	19,524
Investment in unconsolidated subsidiaries
Other investment securities
Carrying Value	3,563	3,563	3,563
Other nonmarketable investment securities
Other investment securities
Carrying Value	$ 2,517	$ 2,517	$ 2,517

Investment Securities - Securit

Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Securities Held to Maturity, Fair Value
Less Than Twelve Months	$ 66,450	$ 456,013	$ 1,062,660
Twelve Months or More	337,108	802,413	341,687
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	324	6,042	24,290
Twelve Months or More	2,611	19,968	14,324
Government-sponsored entities debt
Securities Held to Maturity, Fair Value
Less Than Twelve Months		10,571	39,145
Twelve Months or More	5,742	32,959	8,468
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months		100	1,179
Twelve Months or More	8	652	141
State and municipal obligations
Securities Held to Maturity, Fair Value
Less Than Twelve Months	1,490	40,387	77,373
Twelve Months or More	1,153	14,231	1,348
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months		760	1,617
Twelve Months or More	1	365	32
Mortgage-backed securities
Securities Held to Maturity, Fair Value
Less Than Twelve Months	64,960	405,055	946,142
Twelve Months or More	330,213	755,223	331,871
Securities Available for Sale, Gross Unrealized Losses
Less Than Twelve Months	324	5,182	21,494
Twelve Months or More	$ 2,602	$ 18,951	$ 14,151

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans and Allowance for Loan Losses
Loans, net	$ 11,167,979		$ 10,962,037	$ 10,778,068
Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	8,621,327		7,933,286	7,197,539
Less allowance for non-acquired loan losses	(53,590)	$ (52,008)	(51,194)	(47,874)	$ (45,203)	$ (43,448)
Loans, net	8,567,737		7,882,092	7,149,665
Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	424,584		489,723	556,405
Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	2,180,281		2,594,826	3,076,424
Residential real estate | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	184,208		207,482	229,502
Commercial non-owner occupied real estate | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	2,603,364		2,256,996	2,042,125
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	879,724		841,445	906,890
Less allowance for non-acquired loan losses	(5,718)	(5,371)	(5,682)	(6,187)	(5,847)	(5,921)
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	1,723,640		1,415,551	1,135,235
Less allowance for non-acquired loan losses	(10,311)	(9,740)	(8,754)	(7,209)	(6,798)	(6,525)
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	27,014		32,942	40,951
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	164,540		196,764	227,739
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	60,391		165,070	281,282
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	595,367		679,253	752,465
Commercial owner occupied real estate loan | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	1,589,987		1,517,551	1,372,453
Less allowance for non-acquired loan losses	(9,526)	(9,629)	(9,369)	(8,607)	(8,346)	(8,128)
Commercial owner occupied real estate loan | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	376,187		421,841	486,254
Consumer loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	2,594,191		2,431,413	2,190,870
Consumer loans | Non-acquired loans | Home equity loans
Loans and Allowance for Loan Losses
Total loans	514,242		495,148	456,946
Less allowance for non-acquired loan losses	(3,177)	(3,273)	(3,434)	(3,368)	(3,237)	(3,250)
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	2,079,949		1,936,265	1,733,924
Less allowance for non-acquired loan losses	(12,432)	(12,058)	(11,913)	(10,945)	(10,193)	(9,668)
Consumer loans | Acquired non-credit impaired loans | Home equity loans
Loans and Allowance for Loan Losses
Total loans	208,777		242,425	278,906
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	577,284		628,813	676,596
Commercial and industrial | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	1,114,513		1,054,952	941,067
Less allowance for non-acquired loan losses	(7,495)	(7,249)	(7,454)	(6,711)	(6,333)	(5,488)
Commercial and industrial | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	10,198		10,043	12,580
Commercial and industrial | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	151,579		212,537	304,864
Other income producing property | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	214,203		214,353	205,507
Less allowance for non-acquired loan losses	(1,359)	(1,387)	(1,446)	(1,413)	(1,393)	(1,375)
Other income producing property | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	111,006		133,110	169,392
Consumer | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	503,468		448,664	416,650
Less allowance for non-acquired loan losses	(3,572)	(3,195)	(3,101)	(3,071)	(2,899)	(2,788)
Consumer | Non-acquired loans | Consumer
Loans and Allowance for Loan Losses
Total loans	503,468		448,664	416,650
Consumer | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	38,624		42,492	45,633
Consumer | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	99,690		111,777	126,665
Commercial loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	5,522,067		5,043,852	4,561,152
Other loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	$ 1,601		9,357	28,867
Less allowance for non-acquired loan losses		$ (106)	$ (41)	$ (363)	$ (157)	$ (305)

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses - Summary of acquired non credit impaired loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Acquired credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	$ 424,584		$ 489,723	$ 556,405
Less allowance for loan losses	(4,623)	$ (4,514)	(4,604)	(4,426)	$ (4,084)	$ (4,627)
Acquired loans, net	419,961		485,119	551,979		618,803
Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	2,180,281		2,594,826	3,076,424
Acquired credit impaired loans accounted under FASB 310 30
Loans and Allowance for Loan Losses
Carrying value	424,584		489,723	556,405
Less allowance for loan losses	(4,623)		(4,604)	(4,426)
Acquired loans, net	419,961		485,119	551,979
Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	2,180,281		2,594,826	3,076,424
Unamortized Discounts	26,900		33,400	43,600
Residential real estate | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	184,208		207,482	229,502
Less allowance for loan losses	(2,346)	(2,164)	(2,246)	(2,514)	(2,509)	(3,553)
Residential real estate | Acquired credit impaired loans accounted under FASB 310 30
Loans and Allowance for Loan Losses
Carrying value	184,208		207,482	229,502
Commercial non-owner occupied real estate | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	655,758		844,323	1,033,747
Commercial owner occupied real estate loan | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	376,187		421,841	486,254
Commercial owner occupied real estate loan | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	376,187		421,841	486,254
Consumer loans | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	38,624			45,633
Less allowance for loan losses	(470)	(707)	(761)	(572)	(594)	(461)
Consumer loans | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	786,061		871,238	955,502
Consumer loans | Acquired credit impaired loans accounted under FASB 310 30
Loans and Allowance for Loan Losses
Carrying value	38,624		42,492	45,633
Consumer loans | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	885,751		983,015	1,082,167
Commercial and industrial | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	10,198			12,580
Less allowance for loan losses		(79)	(79)	(128)	(505)	(145)
Commercial and industrial | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	151,579		212,537	304,864
Commercial and industrial | Acquired credit impaired loans accounted under FASB 310 30
Loans and Allowance for Loan Losses
Carrying value	10,198		10,043	12,580
Commercial and industrial | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	151,579		212,537	304,864
Other income producing property | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	111,006		133,110	169,392
Other income producing property | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	111,006		133,110	169,392
Consumer | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	99,690		111,777	126,665
Commercial loans | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	1,294,530		1,611,811	1,994,257
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	27,014		32,942	40,951
Less allowance for loan losses	(798)	(717)	(717)	(576)	(215)	(180)
Construction and land development | Commercial non-owner occupied real estate | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	60,391		165,070	281,282
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans accounted under FASB 310 30
Loans and Allowance for Loan Losses
Carrying value	27,014		32,942	40,951
Construction and land development | Commercial non-owner occupied real estate | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	60,391		165,070	281,282
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	164,540		196,764	227,739
Less allowance for loan losses	(1,009)	$ (847)	(801)	(636)	$ (261)	$ (288)
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	595,367		679,253	752,465
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans accounted under FASB 310 30
Loans and Allowance for Loan Losses
Carrying value	164,540		196,764	227,739
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	595,367		679,253	752,465
Home equity loans | Consumer loans | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	208,777		242,425	278,906
Home equity loans | Consumer loans | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	208,777		242,425	278,906
Consumer | Consumer loans | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	99,690		111,777	126,665
Consumer Owner Occupied Loans | Consumer loans | Acquired non-credit impaired loans accounted under FASB 310 20
Loans and Allowance for Loan Losses
Carrying value	577,284		628,813	676,596
Consumer Owner Occupied Loans | Consumer loans | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Carrying value	$ 577,284		$ 628,813	$ 676,596

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses - Table of loan payment estimates (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Acquired credit impaired loans
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Allowance for loan losses on acquired loans	$ (4,623)	$ (4,426)	$ (4,514)	$ (4,604)	$ (4,084)	$ (4,627)
Contractual principal and interest	538,730	717,180		626,691
Non-accretable difference	(18,156)	(43,397)		(24,818)
Cash flows expected to be collected	520,574	673,783		601,873
Accretable Yield	(100,613)	(121,804)		(116,754)
Acquired loans, net	419,961	551,979		485,119		618,803
Acquired non-credit impaired loans accounted under FASB 310 20
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Contractual principal and interest	2,200,000	3,100,000
After fair value adjustment	2,200,000	3,100,000
Fair value adjustment	26,900	43,600
Acquired credit impaired loans accounted under FASB 310 30
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Allowance for loan losses on acquired loans	(4,623)	(4,426)		(4,604)
Acquired loans, net	419,961	551,979		485,119
Residential real estate | Acquired credit impaired loans
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Allowance for loan losses on acquired loans	(2,346)	(2,514)	(2,164)	(2,246)	(2,509)	(3,553)
Consumer loans | Acquired credit impaired loans
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Allowance for loan losses on acquired loans	(470)	(572)	(707)	(761)	(594)	(461)
Commercial and industrial | Acquired credit impaired loans
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Allowance for loan losses on acquired loans		(128)	(79)	(79)	(505)	(145)
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Allowance for loan losses on acquired loans	(798)	(576)	(717)	(717)	(215)	(180)
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans
Allowance for loan losses on acquired loans	$ (1,009)	$ (636)	$ (847)	$ (801)	$ (261)	$ (288)

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Changes in the carrying value of acquired credit impaired loans (Details)	3 Months Ended	6 Months Ended
	Dec. 31, 2015USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Percentage of loss adjustment based on most current collateral value	90
Maximum
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Threshold limit of loans for risk assessment by loan officers	$ 500,000
Minimum
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Threshold limit of loans for risk assessment by loan officers	$ 100,000
Acquired credit impaired loans
Changes in the carrying value of acquired loans at the acquisition date
Balance at the beginning of the period		$ 485,119,000	$ 618,803,000
Net reductions for payments, foreclosures, and accretion		(65,139,000)	(67,025,000)
Change in the allowance for loan losses on acquired loans		(19,000)	201,000
Balance at the end of the period		419,961,000	551,979,000
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Balance at beginning of period		116,754,000	133,096,000
PSC acquisition Day 1 adjustment			(1,460,000)
Contractual interest income		(14,189,000)	(17,050,000)
Accretion on acquired credit impaired loans		(10,287,000)	(9,013,000)
Reclass of nonaccretable difference due to improvement in expected cash flows		8,468,000	16,453,000
Other changes, net		(133,000)	(222,000)
Balance at end of period		100,613,000	121,804,000
Decline in accretable yield balance		16,100,000
Accretion income		24,500,000
Improved expected cash flows		8,500,000
Contractual principal and interest		538,730,000	717,180,000	$ 626,691,000
Acquired non-credit impaired loans accounted under FASB 310 20
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Contractual principal and interest		2,200,000,000	3,100,000,000
After fair value adjustment		2,200,000,000	3,100,000,000
Fair value adjustment		$ 26,900,000	$ 43,600,000

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Aggregated analysis of the changes in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Changes in allowance for loan losses
Balance at beginning of period	$ 56,522	$ 49,287	$ 55,798	$ 48,075
Loans charged-off	(2,862)	(2,423)	(4,481)	(3,926)
Recoveries of loans previously charged off	991	1,138	1,949	2,105
Net charge-offs	(1,871)	(1,285)	(2,532)	(1,821)
Provision for loan losses charged to operations	3,704	4,478	5,192	6,932
Reduction due to loan removals	(142)	(180)	(245)	(886)
Balance at end of period	58,213	52,300	58,213	52,300
Non-acquired loans
Changes in allowance for loan losses
Balance at beginning of period	52,008	45,203	51,194	43,448
Loans charged-off	(1,327)	(1,240)	(2,572)	(2,409)
Recoveries of loans previously charged off	875	1,051	1,627	1,853
Net charge-offs	(452)	(189)	(945)	(556)
Provision for loan losses charged to operations	2,034	2,860	3,341	4,982
Balance at end of period	53,590	47,874	53,590	47,874
Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off	(1,535)	(1,183)	(1,909)	(1,517)
Recoveries of loans previously charged off	116	87	322	252
Net charge-offs	(1,419)	(1,096)	(1,587)	(1,265)
Provision for loan losses charged to operations	1,419	1,096	1,587	1,265
Acquired credit impaired loans
Changes in allowance for loan losses
Balance at beginning of period	4,514	4,084	4,604	4,627
Provision for loan losses charged to operations	251	522	264	685
Reduction due to loan removals	(142)	(180)	(245)	(886)
Balance at end of period	4,623	4,426	4,623	4,426
Residential real estate | Acquired credit impaired loans
Changes in allowance for loan losses
Reduction due to loan removals	(97)	(132)	(195)	(232)
Commercial owner occupied real estate loan | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off		(81)	(12)	(81)
Recoveries of loans previously charged off	41	25	66	33
Provision for loan losses charged to operations	(144)	317	103	527
Commercial owner occupied real estate loan | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off	(786)	(28)	(786)	(28)
Provision for loan losses charged to operations	786	28	786	28
Consumer loans | Acquired credit impaired loans
Changes in allowance for loan losses
Reduction due to loan removals		(3)		(3)
Commercial and industrial | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off	(90)	(59)	(109)	(144)
Recoveries of loans previously charged off	138	199	209	214
Provision for loan losses charged to operations	198	238	(59)	1,153
Commercial and industrial | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off	(506)	(764)	(640)	(807)
Recoveries of loans previously charged off	6	2	171	55
Provision for loan losses charged to operations	500	762	469	752
Commercial and industrial | Acquired credit impaired loans
Changes in allowance for loan losses
Reduction due to loan removals	(45)	(16)	(45)	(556)
Other income producing property | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off	(31)		(31)
Recoveries of loans previously charged off	13	3	58	11
Provision for loan losses charged to operations	(10)	17	(114)	27
Other income producing property | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off			(26)
Recoveries of loans previously charged off	71		71
Provision for loan losses charged to operations	(71)		(45)
Consumer | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off	(1,146)	(1,095)	(2,308)	(2,074)
Recoveries of loans previously charged off	206	207	458	410
Provision for loan losses charged to operations	1,317	1,060	2,321	1,947
Consumer | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off	(69)	(127)	(205)	(265)
Recoveries of loans previously charged off	11	46	27	49
Provision for loan losses charged to operations	58	81	178	216
Other loans | Non-acquired loans
Changes in allowance for loan losses
Provision for loan losses charged to operations	(106)	206	(41)	58
Construction and land development | Commercial non-owner occupied real estate | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off	(9)		(9)	(35)
Recoveries of loans previously charged off	326	547	625	989
Provision for loan losses charged to operations	30	(207)	(580)	(688)
Construction and land development | Commercial non-owner occupied real estate | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off		(106)	(6)	(107)
Recoveries of loans previously charged off	1	6	2	7
Provision for loan losses charged to operations	(1)	100	4	100
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans
Changes in allowance for loan losses
Reduction due to loan removals		(29)		(82)
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off	(3)		(3)
Recoveries of loans previously charged off	23	2	45	4
Provision for loan losses charged to operations	551	409	1,515	680
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans
Changes in allowance for loan losses
Reduction due to loan removals			(5)	(13)
Home equity loans | Consumer loans | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off		(5)	(15)	(71)
Recoveries of loans previously charged off	98	27	134	128
Provision for loan losses charged to operations	(194)	109	(376)	61
Home equity loans | Consumer loans | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off	(168)	(158)
Recoveries of loans previously charged off	24	28
Provision for loan losses charged to operations	144	130
Home equity loans | Commercial loans | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off			(240)	(240)
Recoveries of loans previously charged off			46	79
Provision for loan losses charged to operations			194	161
Consumer Owner Occupied Loans | Consumer loans | Non-acquired loans
Changes in allowance for loan losses
Loans charged-off	(48)		(85)	(4)
Recoveries of loans previously charged off	30	41	32	64
Provision for loan losses charged to operations	392	711	572	1,217
Consumer Owner Occupied Loans | Consumer loans | Acquired non-credit impaired loans
Changes in allowance for loan losses
Loans charged-off	(6)		(6)	(70)
Recoveries of loans previously charged off	3	5	5	62
Provision for loan losses charged to operations	$ 3	$ (5)	$ 1	$ 8

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Disaggregated analysis of activity in for allowances for non acquired loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Allowance for loan losses:
Charge-offs	$ (2,862)	$ (2,423)	$ (4,481)	$ (3,926)
Recoveries	991	1,138	1,949	2,105
Provision (benefit)	3,704	4,478	5,192	6,932
Non-acquired loans
Allowance for loan losses:
Balance at beginning of period	52,008	45,203	51,194	43,448
Charge-offs	(1,327)	(1,240)	(2,572)	(2,409)
Recoveries	875	1,051	1,627	1,853
Provision (benefit)	2,034	2,860	3,341	4,982
Balance at end of period	53,590	47,874	53,590	47,874
Loans individually evaluated for impairment	1,384	1,829	1,384	1,829
Loans collectively evaluated for impairment	52,206	46,045	52,206	46,045
Loans:
Loans individually evaluated for impairment	54,509	62,593	54,509	62,593
Loans collectively evaluated for impairment	8,566,818	7,134,946	8,566,818	7,134,946
Total loans	8,621,327	7,197,539	8,621,327	7,197,539	$ 7,933,286
Acquired non-credit impaired loans
Allowance for loan losses:
Charge-offs	(1,535)	(1,183)	(1,909)	(1,517)
Recoveries	116	87	322	252
Provision (benefit)	1,419	1,096	1,587	1,265
Loans:
Loans collectively evaluated for impairment	2,180,281	3,076,424	2,180,281	3,076,424
Total loans	2,180,281	3,076,424	2,180,281	3,076,424	2,594,826
Commercial non-owner occupied real estate | Non-acquired loans
Loans:
Total loans	2,603,364	2,042,125	2,603,364	2,042,125	2,256,996
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development
Allowance for loan losses:
Balance at beginning of period	5,371	5,847	5,682	5,921
Charge-offs	(9)		(9)	(35)
Recoveries	326	547	625	989
Provision (benefit)	30	(207)	(580)	(688)
Balance at end of period	5,718	6,187	5,718	6,187
Loans individually evaluated for impairment	715	846	715	846
Loans collectively evaluated for impairment	5,003	5,341	5,003	5,341
Loans:
Loans individually evaluated for impairment	36,130	42,392	36,130	42,392
Loans collectively evaluated for impairment	843,594	864,498	843,594	864,498
Total loans	879,724	906,890	879,724	906,890	841,445
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate
Allowance for loan losses:
Balance at beginning of period	9,740	6,798	8,754	6,525
Charge-offs	(3)		(3)
Recoveries	23	2	45	4
Provision (benefit)	551	409	1,515	680
Balance at end of period	10,311	7,209	10,311	7,209
Loans individually evaluated for impairment	1	93	1	93
Loans collectively evaluated for impairment	10,310	7,116	10,310	7,116
Loans:
Loans individually evaluated for impairment	101	1,348	101	1,348
Loans collectively evaluated for impairment	1,723,539	1,133,887	1,723,539	1,133,887
Total loans	1,723,640	1,135,235	1,723,640	1,135,235	1,415,551
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development
Allowance for loan losses:
Charge-offs		(106)	(6)	(107)
Recoveries	1	6	2	7
Provision (benefit)	(1)	100	4	100
Loans:
Loans collectively evaluated for impairment	60,391	281,282	60,391	281,282
Total loans	60,391	281,282	60,391	281,282	165,070
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate
Loans:
Loans collectively evaluated for impairment	595,367	752,465	595,367	752,465
Total loans	595,367	752,465	595,367	752,465	679,253
Commercial owner occupied real estate loan | Non-acquired loans
Allowance for loan losses:
Balance at beginning of period	9,629	8,346	9,369	8,128
Charge-offs		(81)	(12)	(81)
Recoveries	41	25	66	33
Provision (benefit)	(144)	317	103	527
Balance at end of period	9,526	8,607	9,526	8,607
Loans individually evaluated for impairment	33	44	33	44
Loans collectively evaluated for impairment	9,493	8,563	9,493	8,563
Loans:
Loans individually evaluated for impairment	5,440	4,750	5,440	4,750
Loans collectively evaluated for impairment	1,584,547	1,367,703	1,584,547	1,367,703
Total loans	1,589,987	1,372,453	1,589,987	1,372,453	1,517,551
Commercial owner occupied real estate loan | Acquired non-credit impaired loans
Allowance for loan losses:
Charge-offs	(786)	(28)	(786)	(28)
Provision (benefit)	786	28	786	28
Loans:
Loans collectively evaluated for impairment	376,187	486,254	376,187	486,254
Total loans	376,187	486,254	376,187	486,254	421,841
Consumer loans | Non-acquired loans
Loans:
Total loans	2,594,191	2,190,870	2,594,191	2,190,870	2,431,413
Consumer loans | Non-acquired loans | Home equity loans
Allowance for loan losses:
Balance at beginning of period	3,273	3,237	3,434	3,250
Charge-offs		(5)	(15)	(71)
Recoveries	98	27	134	128
Provision (benefit)	(194)	109	(376)	61
Balance at end of period	3,177	3,368	3,177	3,368
Loans individually evaluated for impairment	125	180	125	180
Loans collectively evaluated for impairment	3,052	3,188	3,052	3,188
Loans:
Loans individually evaluated for impairment	2,436	3,144	2,436	3,144
Loans collectively evaluated for impairment	511,806	453,802	511,806	453,802
Total loans	514,242	456,946	514,242	456,946	495,148
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans
Allowance for loan losses:
Balance at beginning of period	12,058	10,193	11,913	9,668
Charge-offs	(48)		(85)	(4)
Recoveries	30	41	32	64
Provision (benefit)	392	711	572	1,217
Balance at end of period	12,432	10,945	12,432	10,945
Loans individually evaluated for impairment	35	30	35	30
Loans collectively evaluated for impairment	12,397	10,915	12,397	10,915
Loans:
Loans individually evaluated for impairment	5,566	5,628	5,566	5,628
Loans collectively evaluated for impairment	2,074,383	1,728,296	2,074,383	1,728,296
Total loans	2,079,949	1,733,924	2,079,949	1,733,924	1,936,265
Consumer loans | Acquired non-credit impaired loans | Home equity loans
Allowance for loan losses:
Charge-offs	(168)	(158)
Recoveries	24	28
Provision (benefit)	144	130
Loans:
Loans collectively evaluated for impairment	208,777	278,906	208,777	278,906
Total loans	208,777	278,906	208,777	278,906	242,425
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans
Allowance for loan losses:
Charge-offs	(6)		(6)	(70)
Recoveries	3	5	5	62
Provision (benefit)	3	(5)	1	8
Loans:
Loans collectively evaluated for impairment	577,284	676,596	577,284	676,596
Total loans	577,284	676,596	577,284	676,596	628,813
Commercial and industrial | Non-acquired loans
Allowance for loan losses:
Balance at beginning of period	7,249	6,333	7,454	5,488
Charge-offs	(90)	(59)	(109)	(144)
Recoveries	138	199	209	214
Provision (benefit)	198	238	(59)	1,153
Balance at end of period	7,495	6,711	7,495	6,711
Loans individually evaluated for impairment	394	485	394	485
Loans collectively evaluated for impairment	7,101	6,226	7,101	6,226
Loans:
Loans individually evaluated for impairment	2,674	1,834	2,674	1,834
Loans collectively evaluated for impairment	1,111,839	939,233	1,111,839	939,233
Total loans	1,114,513	941,067	1,114,513	941,067	1,054,952
Commercial and industrial | Acquired non-credit impaired loans
Allowance for loan losses:
Charge-offs	(506)	(764)	(640)	(807)
Recoveries	6	2	171	55
Provision (benefit)	500	762	469	752
Loans:
Loans collectively evaluated for impairment	151,579	304,864	151,579	304,864
Total loans	151,579	304,864	151,579	304,864	212,537
Other income producing property | Non-acquired loans
Allowance for loan losses:
Balance at beginning of period	1,387	1,393	1,446	1,375
Charge-offs	(31)		(31)
Recoveries	13	3	58	11
Provision (benefit)	(10)	17	(114)	27
Balance at end of period	1,359	1,413	1,359	1,413
Loans individually evaluated for impairment	78	144	78	144
Loans collectively evaluated for impairment	1,281	1,269	1,281	1,269
Loans:
Loans individually evaluated for impairment	2,064	3,240	2,064	3,240
Loans collectively evaluated for impairment	212,139	202,267	212,139	202,267
Total loans	214,203	205,507	214,203	205,507	214,353
Other income producing property | Acquired non-credit impaired loans
Allowance for loan losses:
Charge-offs			(26)
Recoveries	71		71
Provision (benefit)	(71)		(45)
Loans:
Loans collectively evaluated for impairment	111,006	169,392	111,006	169,392
Total loans	111,006	169,392	111,006	169,392	133,110
Consumer | Non-acquired loans
Allowance for loan losses:
Balance at beginning of period	3,195	2,899	3,101	2,788
Charge-offs	(1,146)	(1,095)	(2,308)	(2,074)
Recoveries	206	207	458	410
Provision (benefit)	1,317	1,060	2,321	1,947
Balance at end of period	3,572	3,071	3,572	3,071
Loans individually evaluated for impairment	3	7	3	7
Loans collectively evaluated for impairment	3,569	3,064	3,569	3,064
Loans:
Loans individually evaluated for impairment	98	257	98	257
Loans collectively evaluated for impairment	503,370	416,393	503,370	416,393
Total loans	503,468	416,650	503,468	416,650	448,664
Consumer | Non-acquired loans | Consumer
Loans:
Total loans	503,468	416,650	503,468	416,650	448,664
Consumer | Acquired non-credit impaired loans
Allowance for loan losses:
Charge-offs	(69)	(127)	(205)	(265)
Recoveries	11	46	27	49
Provision (benefit)	58	81	178	216
Loans:
Loans collectively evaluated for impairment	99,690	126,665	99,690	126,665
Total loans	99,690	126,665	99,690	126,665	111,777
Commercial loans | Non-acquired loans
Loans:
Total loans	5,522,067	4,561,152	5,522,067	4,561,152	5,043,852
Commercial loans | Acquired non-credit impaired loans | Home equity loans
Allowance for loan losses:
Charge-offs			(240)	(240)
Recoveries			46	79
Provision (benefit)			194	161
Other loans | Non-acquired loans
Allowance for loan losses:
Balance at beginning of period	106	157	41	305
Provision (benefit)	(106)	206	(41)	58
Balance at end of period		363		363
Loans collectively evaluated for impairment		363		363
Loans:
Loans collectively evaluated for impairment	1,601	28,867	1,601	28,867
Total loans	$ 1,601	$ 28,867	$ 1,601	$ 28,867	$ 9,357

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses - Disaggregated analysis of activity in the allowance for acquired credit impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Allowance for loan losses:
Reduction due to loan removals	$ (142)	$ (180)	$ (245)	$ (886)
Non-acquired loans
Allowance for loan losses:
Loans individually evaluated for impairment	1,384	1,829	1,384	1,829
Loans collectively evaluated for impairment	52,206	46,045	52,206	46,045
Loans:
Loans individually evaluated for impairment	54,509	62,593	54,509	62,593
Loans collectively evaluated for impairment	8,566,818	7,134,946	8,566,818	7,134,946
Acquired credit impaired loans
Allowance for loan losses:
Balance at the beginning of the period	4,514	4,084	4,604	4,627
Provision (benefit) for loan losses	251	522	264	685
Reduction due to loan removals	(142)	(180)	(245)	(886)
Balance at the end of the period	4,623	4,426	4,623	4,426
Loans collectively evaluated for impairment	4,623	4,426	4,623	4,426
Loans:
Loans collectively evaluated for impairment	424,584	556,405	424,584	556,405
Carrying value	424,584	556,405	424,584	556,405	$ 489,723
Acquired non-credit impaired loans
Loans:
Loans collectively evaluated for impairment	2,180,281	3,076,424	2,180,281	3,076,424
Carrying value	2,180,281	3,076,424	2,180,281	3,076,424	2,594,826
Residential real estate | Acquired credit impaired loans
Allowance for loan losses:
Balance at the beginning of the period	2,164	2,509	2,246	3,553
Provision (benefit) for loan losses	279	137	295	(807)
Reduction due to loan removals	(97)	(132)	(195)	(232)
Balance at the end of the period	2,346	2,514	2,346	2,514
Loans collectively evaluated for impairment	2,346	2,514	2,346	2,514
Loans:
Loans collectively evaluated for impairment	184,208	229,502	184,208	229,502
Carrying value	184,208	229,502	184,208	229,502	207,482
Commercial non-owner occupied real estate | Construction and land development | Non-acquired loans
Allowance for loan losses:
Loans individually evaluated for impairment	715	846	715	846
Loans collectively evaluated for impairment	5,003	5,341	5,003	5,341
Loans:
Loans individually evaluated for impairment	36,130	42,392	36,130	42,392
Loans collectively evaluated for impairment	843,594	864,498	843,594	864,498
Commercial non-owner occupied real estate | Construction and land development | Acquired credit impaired loans
Allowance for loan losses:
Balance at the beginning of the period	717	215	717	180
Provision (benefit) for loan losses	81	390	81	478
Reduction due to loan removals		(29)		(82)
Balance at the end of the period	798	576	798	576
Loans collectively evaluated for impairment	798	576	798	576
Loans:
Loans collectively evaluated for impairment	27,014	40,951	27,014	40,951
Carrying value	27,014	40,951	27,014	40,951	32,942
Commercial non-owner occupied real estate | Construction and land development | Acquired non-credit impaired loans
Loans:
Loans collectively evaluated for impairment	60,391	281,282	60,391	281,282
Carrying value	60,391	281,282	60,391	281,282	165,070
Commercial non-owner occupied real estate | Other commercial non-owner occupied real estate | Non-acquired loans
Allowance for loan losses:
Loans individually evaluated for impairment	1	93	1	93
Loans collectively evaluated for impairment	10,310	7,116	10,310	7,116
Loans:
Loans individually evaluated for impairment	101	1,348	101	1,348
Loans collectively evaluated for impairment	1,723,539	1,133,887	1,723,539	1,133,887
Commercial non-owner occupied real estate | Other commercial non-owner occupied real estate | Acquired credit impaired loans
Allowance for loan losses:
Balance at the beginning of the period	847	261	801	288
Provision (benefit) for loan losses	162	375	213	361
Reduction due to loan removals			(5)	(13)
Balance at the end of the period	1,009	636	1,009	636
Loans collectively evaluated for impairment	1,009	636	1,009	636
Loans:
Loans collectively evaluated for impairment	164,540	227,739	164,540	227,739
Carrying value	164,540	227,739	164,540	227,739	196,764
Commercial non-owner occupied real estate | Other commercial non-owner occupied real estate | Acquired non-credit impaired loans
Loans:
Loans collectively evaluated for impairment	595,367	752,465	595,367	752,465
Carrying value	595,367	752,465	595,367	752,465	679,253
Consumer loans | Acquired credit impaired loans
Allowance for loan losses:
Balance at the beginning of the period	707	594	761	461
Provision (benefit) for loan losses	(237)	(19)	(291)	114
Reduction due to loan removals		(3)		(3)
Balance at the end of the period	470	572	470	572
Loans collectively evaluated for impairment	470	572	470	572
Loans:
Loans collectively evaluated for impairment	38,624	45,633	38,624	45,633
Carrying value	38,624	45,633	38,624	45,633
Consumer loans | Acquired non-credit impaired loans
Loans:
Carrying value	885,751	1,082,167	885,751	1,082,167	983,015
Consumer loans | Home equity loans | Non-acquired loans
Allowance for loan losses:
Loans individually evaluated for impairment	125	180	125	180
Loans collectively evaluated for impairment	3,052	3,188	3,052	3,188
Loans:
Loans individually evaluated for impairment	2,436	3,144	2,436	3,144
Loans collectively evaluated for impairment	511,806	453,802	511,806	453,802
Consumer loans | Home equity loans | Acquired non-credit impaired loans
Loans:
Loans collectively evaluated for impairment	208,777	278,906	208,777	278,906
Carrying value	208,777	278,906	208,777	278,906	242,425
Commercial and industrial | Non-acquired loans
Allowance for loan losses:
Loans individually evaluated for impairment	394	485	394	485
Loans collectively evaluated for impairment	7,101	6,226	7,101	6,226
Loans:
Loans individually evaluated for impairment	2,674	1,834	2,674	1,834
Loans collectively evaluated for impairment	1,111,839	939,233	1,111,839	939,233
Commercial and industrial | Acquired credit impaired loans
Allowance for loan losses:
Balance at the beginning of the period	79	505	79	145
Provision (benefit) for loan losses	(34)	(361)	(34)	539
Reduction due to loan removals	(45)	(16)	(45)	(556)
Balance at the end of the period		128		128
Loans collectively evaluated for impairment		128		128
Loans:
Loans collectively evaluated for impairment	10,198	12,580	10,198	12,580
Carrying value	10,198	12,580	10,198	12,580
Commercial and industrial | Acquired non-credit impaired loans
Loans:
Loans collectively evaluated for impairment	151,579	304,864	151,579	304,864
Carrying value	151,579	304,864	151,579	304,864	212,537
Other income producing property | Non-acquired loans
Allowance for loan losses:
Loans individually evaluated for impairment	78	144	78	144
Loans collectively evaluated for impairment	1,281	1,269	1,281	1,269
Loans:
Loans individually evaluated for impairment	2,064	3,240	2,064	3,240
Loans collectively evaluated for impairment	212,139	202,267	212,139	202,267
Other income producing property | Acquired non-credit impaired loans
Loans:
Loans collectively evaluated for impairment	111,006	169,392	111,006	169,392
Carrying value	111,006	169,392	111,006	169,392	133,110
Consumer | Non-acquired loans
Allowance for loan losses:
Loans individually evaluated for impairment	3	7	3	7
Loans collectively evaluated for impairment	3,569	3,064	3,569	3,064
Loans:
Loans individually evaluated for impairment	98	257	98	257
Loans collectively evaluated for impairment	503,370	416,393	503,370	416,393
Consumer | Acquired non-credit impaired loans
Loans:
Loans collectively evaluated for impairment	99,690	126,665	99,690	126,665
Commercial loans | Acquired non-credit impaired loans
Loans:
Carrying value	$ 1,294,530	$ 1,994,257	$ 1,294,530	$ 1,994,257	$ 1,611,811

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses - Credit risk profile by risk grade of non acquired loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Loans and Allowance for Loan Losses
Other Real Estate, Non Covered	$ 14,506	$ 11,410	$ 17,222	$ 11,203
Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	8,621,327	7,933,286	7,197,539
Non-acquired loans | Pass
Loans and Allowance for Loan Losses
Total loans	8,504,898	7,813,938	7,082,951
Non-acquired loans | Special mention
Loans and Allowance for Loan Losses
Total loans	66,580	66,645	67,388
Non-acquired loans | Substandard
Loans and Allowance for Loan Losses
Total loans	49,849	52,703	47,200
Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	2,180,281	2,594,826	3,076,424
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,180,281	2,594,826	3,076,424
Acquired non-credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,109,875	2,523,010	3,006,269
Acquired non-credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	41,016	48,716	46,650
Acquired non-credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	29,390	23,100	23,505
Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	424,584	489,723	556,405
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	424,584	489,723	556,405
Acquired credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	256,105	296,106	332,005
Acquired credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	69,770	74,388	90,293
Acquired credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	98,709	119,229	134,107
Residential real estate | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	184,208	207,482	229,502
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	184,208	207,482	229,502
Residential real estate | Acquired credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	93,303	104,181	116,461
Residential real estate | Acquired credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	39,020	41,964	46,089
Residential real estate | Acquired credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	51,885	61,337	66,952
Commercial non-owner occupied real estate | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	2,603,364	2,256,996	2,042,125
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	879,724	841,445	906,890
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Pass
Loans and Allowance for Loan Losses
Total loans	871,393	832,612	895,887
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Special mention
Loans and Allowance for Loan Losses
Total loans	5,948	6,015	7,858
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Substandard
Loans and Allowance for Loan Losses
Total loans	2,383	2,818	3,145
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	1,723,640	1,415,551	1,135,235
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Pass
Loans and Allowance for Loan Losses
Total loans	1,714,606	1,407,744	1,126,099
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Special mention
Loans and Allowance for Loan Losses
Total loans	7,557	6,427	7,378
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Substandard
Loans and Allowance for Loan Losses
Total loans	1,477	1,380	1,758
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	60,391	165,070	281,282
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	60,391	165,070	281,282
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	58,165	163,777	279,239
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	821	838	1,449
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,405	455	594
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	595,367	679,253	752,465
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	595,367	679,253	752,465
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	583,416	665,913	738,293
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	5,753	13,018	14,164
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	6,198	322	8
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development
Loans and Allowance for Loan Losses
Total loans	27,014	32,942	40,951
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	27,014	32,942	40,951
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	18,665	20,293	25,243
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,181	3,001	4,884
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	5,168	9,648	10,824
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Total loans	164,540	196,764	227,739
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	164,540	196,764	227,739
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	132,852	160,788	177,996
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	13,811	14,393	22,568
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	17,877	21,583	27,175
Commercial owner occupied real estate loan | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	1,589,987	1,517,551	1,372,453
Commercial owner occupied real estate loan | Non-acquired loans | Pass
Loans and Allowance for Loan Losses
Total loans	1,561,594	1,480,267	1,343,624
Commercial owner occupied real estate loan | Non-acquired loans | Special mention
Loans and Allowance for Loan Losses
Total loans	16,310	24,576	18,808
Commercial owner occupied real estate loan | Non-acquired loans | Substandard
Loans and Allowance for Loan Losses
Total loans	12,083	12,708	10,021
Commercial owner occupied real estate loan | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	376,187	421,841	486,254
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	376,187	421,841	486,254
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	359,783	411,783	479,399
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	12,841	5,664	5,871
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,563	4,394	984
Consumer loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	2,594,191	2,431,413	2,190,870
Consumer loans | Non-acquired loans | Home equity loans
Loans and Allowance for Loan Losses
Total loans	514,242	495,148	456,946
Consumer loans | Non-acquired loans | Home equity loans | Pass
Loans and Allowance for Loan Losses
Total loans	502,305	481,607	443,953
Consumer loans | Non-acquired loans | Home equity loans | Special mention
Loans and Allowance for Loan Losses
Total loans	5,731	7,293	6,805
Consumer loans | Non-acquired loans | Home equity loans | Substandard
Loans and Allowance for Loan Losses
Total loans	6,206	6,248	6,188
Consumer loans | Non-acquired loans | All Consumer
Loans and Allowance for Loan Losses
Total loans	3,099,260	2,889,434	2,636,387
Consumer loans | Non-acquired loans | All Consumer | Pass
Loans and Allowance for Loan Losses
Total loans	3,058,188	2,847,214	2,594,447
Consumer loans | Non-acquired loans | All Consumer | Special mention
Loans and Allowance for Loan Losses
Total loans	16,110	19,034	19,994
Consumer loans | Non-acquired loans | All Consumer | Substandard
Loans and Allowance for Loan Losses
Total loans	24,962	23,186	21,946
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	2,079,949	1,936,265	1,733,924
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Pass
Loans and Allowance for Loan Losses
Total loans	2,052,808	1,909,427	1,706,574
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Special mention
Loans and Allowance for Loan Losses
Total loans	9,936	11,304	12,566
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Substandard
Loans and Allowance for Loan Losses
Total loans	17,205	15,534	14,784
Consumer loans | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	885,751	983,015	1,082,167
Consumer loans | Acquired non-credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	859,453	953,739	1,052,395
Consumer loans | Acquired non-credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	12,845	16,254	16,537
Consumer loans | Acquired non-credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	13,453	13,022	13,235
Consumer loans | Acquired non-credit impaired loans | Home equity loans
Loans and Allowance for Loan Losses
Total loans	208,777	242,425	278,906
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	208,777	242,425	278,906
Consumer loans | Acquired non-credit impaired loans | Home equity loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	196,254	227,515	263,994
Consumer loans | Acquired non-credit impaired loans | Home equity loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	5,459	7,688	8,319
Consumer loans | Acquired non-credit impaired loans | Home equity loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	7,064	7,222	6,593
Consumer loans | Acquired non-credit impaired loans | Consumer
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	99,690	111,777	126,665
Consumer loans | Acquired non-credit impaired loans | Consumer | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	96,766	108,833	123,807
Consumer loans | Acquired non-credit impaired loans | Consumer | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	637	698	723
Consumer loans | Acquired non-credit impaired loans | Consumer | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,287	2,246	2,135
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Total loans	577,284	628,813	676,596
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	577,284	628,813	676,596
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	566,433	617,391	664,594
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	6,749	7,868	7,495
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	4,102	3,554	4,507
Consumer loans | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	38,624		45,633
Commercial and industrial | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	1,114,513	1,054,952	941,067
Commercial and industrial | Non-acquired loans | Pass
Loans and Allowance for Loan Losses
Total loans	1,090,519	1,037,915	923,995
Commercial and industrial | Non-acquired loans | Special mention
Loans and Allowance for Loan Losses
Total loans	16,279	5,887	8,522
Commercial and industrial | Non-acquired loans | Substandard
Loans and Allowance for Loan Losses
Total loans	7,715	11,150	8,550
Commercial and industrial | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	151,579	212,537	304,864
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	151,579	212,537	304,864
Commercial and industrial | Acquired non-credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	145,733	202,399	291,755
Commercial and industrial | Acquired non-credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,616	6,523	5,248
Commercial and industrial | Acquired non-credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	3,230	3,615	7,861
Commercial and industrial | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	10,198	10,043	12,580
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	10,198		12,580
Other income producing property | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	214,203	214,353	205,507
Other income producing property | Non-acquired loans | Pass
Loans and Allowance for Loan Losses
Total loans	208,598	208,186	198,899
Other income producing property | Non-acquired loans | Special mention
Loans and Allowance for Loan Losses
Total loans	4,376	4,706	4,828
Other income producing property | Non-acquired loans | Substandard
Loans and Allowance for Loan Losses
Total loans	1,229	1,461	1,780
Other income producing property | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	111,006	133,110	169,392
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	111,006	133,110	169,392
Other income producing property | Acquired non-credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	103,325	125,399	165,188
Other income producing property | Acquired non-credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	6,140	6,419	3,381
Other income producing property | Acquired non-credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,541	1,292	823
Consumer | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	503,468	448,664	416,650
Consumer | Non-acquired loans | Consumer
Loans and Allowance for Loan Losses
Total loans	503,468	448,664	416,650
Consumer | Non-acquired loans | Consumer | Pass
Loans and Allowance for Loan Losses
Total loans	501,474	446,823	415,053
Consumer | Non-acquired loans | Consumer | Special mention
Loans and Allowance for Loan Losses
Total loans	443	437	623
Consumer | Non-acquired loans | Consumer | Substandard
Loans and Allowance for Loan Losses
Total loans	1,551	1,404	974
Consumer | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Total loans	99,690	111,777	126,665
Consumer | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Total loans	38,624	42,492	45,633
Commercial loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	5,522,067	5,043,852	4,561,152
Commercial loans | Non-acquired loans | Pass
Loans and Allowance for Loan Losses
Total loans	5,446,710	4,966,724	4,488,504
Commercial loans | Non-acquired loans | Special mention
Loans and Allowance for Loan Losses
Total loans	50,470	47,611	47,394
Commercial loans | Non-acquired loans | Substandard
Loans and Allowance for Loan Losses
Total loans	24,887	29,517	25,254
Commercial loans | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,294,530	1,611,811	1,994,257
Commercial loans | Acquired non-credit impaired loans | Pass
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,250,422	1,569,271	1,953,874
Commercial loans | Acquired non-credit impaired loans | Special mention
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	28,171	32,462	30,113
Commercial loans | Acquired non-credit impaired loans | Substandard
Loans and Allowance for Loan Losses
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	15,937	10,078	10,270
Other loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	1,601	9,357	28,867
Other loans | Non-acquired loans | Pass
Loans and Allowance for Loan Losses
Total loans	$ 1,601	$ 9,357	$ 28,867

Loans and Allowance for Loan_11

Loans and Allowance for Loan Losses - Aging analysis of past due loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Non-acquired loans
Loans and Allowance for Loan Losses
Past due	$ 17,938	$ 14,555	$ 14,681
Current	8,603,389	7,918,731	7,182,858
Total loans	8,621,327	7,933,286	7,197,539
Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	5,554	6,108	5,940
Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	6,217	3,459	2,779
Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	6,167	4,988	5,962
Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due	16,616	26,998	31,094
Current	407,968	462,725	525,311
Total loans	424,584	489,723	556,405
Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	4,636	8,770	6,967
Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	2,519	1,465	5,102
Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	9,461	16,763	19,025
Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due	12,238	15,532	15,089
Current	2,168,043	2,579,294	3,061,335
Total loans	2,180,281	2,594,826	3,076,424
Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	6,406	8,456	8,908
Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	2,604	2,750	1,459
Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	3,228	4,326	4,722
Residential real estate | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due	9,414	14,358	16,216
Current	174,794	193,124	213,286
Total loans	184,208	207,482	229,502
Residential real estate | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	3,011	4,620	5,279
Residential real estate | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	2,101	1,251	3,989
Residential real estate | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	4,302	8,487	6,948
Commercial non-owner occupied real estate | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	2,603,364	2,256,996	2,042,125
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development
Loans and Allowance for Loan Losses
Past due	1,182	1,450	1,566
Current	878,542	839,995	905,324
Total loans	879,724	841,445	906,890
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	630	693	1,222
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	54	305
Commercial non-owner occupied real estate | Non-acquired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	498	452	344
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Past due		482	1,032
Current	1,723,640	1,415,069	1,134,203
Total loans	1,723,640	1,415,551	1,135,235
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due		68	354
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due		18	19
Commercial non-owner occupied real estate | Non-acquired loans | Other commercial non-owner occupied real estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due		396	659
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development
Loans and Allowance for Loan Losses
Past due	278	2,943	3,387
Current	26,736	29,999	37,564
Total loans	27,014	32,942	40,951
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	126	115	175
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due		12
Commercial non-owner occupied real estate | Acquired credit impaired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	152	2,816	3,212
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Past due	5,390	5,521	8,811
Current	159,150	191,243	218,928
Total loans	164,540	196,764	227,739
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	883	876	621
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	244	112	553
Commercial non-owner occupied real estate | Acquired credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	4,263	4,533	7,637
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development
Loans and Allowance for Loan Losses
Past due	655	1,057	1,041
Current	59,736	164,013	280,241
Total loans	60,391	165,070	281,282
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	169	647	666
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	169	45	66
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Construction and land development | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	317	365	309
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Past due	905	911	3,093
Current	594,462	678,342	749,372
Total loans	595,367	679,253	752,465
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	640	607	2,936
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due		21
Commercial non-owner occupied real estate | Acquired non-credit impaired loans | Other commercial non-owner occupied real estate | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	265	283	157
Commercial owner occupied real estate loan | Non-acquired loans
Loans and Allowance for Loan Losses
Past due	7,149	4,038	4,491
Current	1,582,838	1,513,513	1,367,962
Total loans	1,589,987	1,517,551	1,372,453
Commercial owner occupied real estate loan | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	1,474	1,639	1,578
Commercial owner occupied real estate loan | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	4,514	1,495	1,599
Commercial owner occupied real estate loan | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	1,161	904	1,314
Commercial owner occupied real estate loan | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due	2,190	1,970	1,869
Current	373,997	419,871	484,385
Total loans	376,187	421,841	486,254
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	933	964	1,121
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	366	1,006	11
Commercial owner occupied real estate loan | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	891		737
Consumer loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	2,594,191	2,431,413	2,190,870
Consumer loans | Non-acquired loans | Home equity loans
Loans and Allowance for Loan Losses
Past due	1,152	1,989	2,500
Current	513,090	493,159	454,446
Total loans	514,242	495,148	456,946
Consumer loans | Non-acquired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	424	744	913
Consumer loans | Non-acquired loans | Home equity loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	136	532	473
Consumer loans | Non-acquired loans | Home equity loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	592	713	1,114
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Past due	3,837	3,192	1,766
Current	2,076,112	1,933,073	1,732,158
Total loans	2,079,949	1,936,265	1,733,924
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	669	1,460	479
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	215	789	387
Consumer loans | Non-acquired loans | Consumer Owner Occupied Loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	2,953	943	900
Consumer loans | Non-acquired loans | All Consumer
Loans and Allowance for Loan Losses
Total loans	3,099,260	2,889,434	2,636,387
Consumer loans | Acquired non-credit impaired loans | Home equity loans
Loans and Allowance for Loan Losses
Past due	2,016	3,937	4,179
Current	206,761	238,488	274,727
Total loans	208,777	242,425	278,906
Consumer loans | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	1,107	1,286	1,656
Consumer loans | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	322	442	326
Consumer loans | Acquired non-credit impaired loans | Home equity loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	587	2,209	2,197
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Past due	1,383	2,537	2,501
Current	575,901	626,276	674,095
Total loans	577,284	628,813	676,596
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	970	1,127	1,434
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due		621	207
Consumer loans | Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	413	789	860
Commercial and industrial | Non-acquired loans
Loans and Allowance for Loan Losses
Past due	1,483	1,591	1,671
Current	1,113,030	1,053,361	939,396
Total loans	1,114,513	1,054,952	941,067
Commercial and industrial | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	1,007	898	762
Commercial and industrial | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	369	120	94
Commercial and industrial | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	107	573	815
Commercial and industrial | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due	129	2,525	976
Current	10,069	7,518	11,604
Total loans	10,198	10,043	12,580
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	49	2,437	125
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due			386
Commercial and industrial | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	80	88	465
Commercial and industrial | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due	3,132	2,797	254
Current	148,447	209,740	304,610
Total loans	151,579	212,537	304,864
Commercial and industrial | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	1,266	2,648	115
Commercial and industrial | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	1,543	130	118
Commercial and industrial | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	323	19	21
Other income producing property | Non-acquired loans
Loans and Allowance for Loan Losses
Past due	1,298	484	421
Current	212,905	213,869	205,086
Total loans	214,203	214,353	205,507
Other income producing property | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	674	169	157
Other income producing property | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	514	26	5
Other income producing property | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	110	289	259
Other income producing property | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due	1,016	1,008	703
Current	109,990	132,102	168,689
Total loans	111,006	133,110	169,392
Other income producing property | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	897	603	544
Other income producing property | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	10	276	14
Other income producing property | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	109	129	145
Consumer | Non-acquired loans
Loans and Allowance for Loan Losses
Past due	1,837	1,329	1,234
Current	501,631	447,335	415,416
Total loans	503,468	448,664	416,650
Consumer | Non-acquired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	676	437	475
Consumer | Non-acquired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	415	174	202
Consumer | Non-acquired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	746	718	557
Consumer | Non-acquired loans | Consumer
Loans and Allowance for Loan Losses
Total loans	503,468	448,664	416,650
Consumer | Acquired credit impaired loans
Loans and Allowance for Loan Losses
Past due	1,405	1,651	1,704
Current	37,219	40,841	43,929
Total loans	38,624	42,492	45,633
Consumer | Acquired credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	567	722	767
Consumer | Acquired credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	174	90	174
Consumer | Acquired credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	664	839	763
Consumer | Acquired non-credit impaired loans
Loans and Allowance for Loan Losses
Past due	941	1,315	1,449
Current	98,749	110,462	125,216
Total loans	99,690	111,777	126,665
Consumer | Acquired non-credit impaired loans | Financing Receivables, 30 to 59 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	424	574	436
Consumer | Acquired non-credit impaired loans | Financing Receivables, 60 to 89 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	194	209	717
Consumer | Acquired non-credit impaired loans | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans and Allowance for Loan Losses
Past due	323	532	296
Commercial loans | Non-acquired loans
Loans and Allowance for Loan Losses
Total loans	5,522,067	5,043,852	4,561,152
Other loans | Non-acquired loans
Loans and Allowance for Loan Losses
Current	1,601	9,357	28,867
Total loans	$ 1,601	$ 9,357	$ 28,867

Loans and Allowance for Loan_12

Loans and Allowance for Loan Losses - Nonaccrual loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	$ 15,325	$ 14,760	$ 15,325	$ 14,760	$ 14,827
Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	57,153	65,208	57,153	65,208	59,460
Recorded Investment With No Allowance	9,944	11,197	9,944	11,197	10,714
Gross Recorded Investment With Allowance	44,565	51,396	44,565	51,396	46,304
Total Recorded Investment	54,509	62,593	54,509	62,593	57,018
Related Allowance	1,384	1,829	1,384	1,829	1,628
Average Investment In Impaired Loans	55,391	64,645	55,764	63,008
Interest Income Recognized	572	520	1,253	1,248
Acquired non-credit impaired non-accrual including restructured loans
Loans and Allowance for Loan Losses
Nonaccrual loans	9,948	9,373	9,948	9,373	13,489
Commercial non-owner occupied real estate | Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	780	1,532	780	1,532	1,255
Commercial non-owner occupied real estate | Non acquired non-accrual loans | Construction and land development
Loans and Allowance for Loan Losses
Nonaccrual loans	299	423	299	423	424
Commercial non-owner occupied real estate | Non acquired non-accrual loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Nonaccrual loans	481	1,109	481	1,109	831
Commercial non-owner occupied real estate | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20 | Construction and land development
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	36,539	42,955	36,539	42,955	38,314
Recorded Investment With No Allowance	321	600	321	600	339
Gross Recorded Investment With Allowance	35,809	41,792	35,809	41,792	37,574
Total Recorded Investment	36,130	42,392	36,130	42,392	37,913
Related Allowance	715	846	715	846	788
Average Investment In Impaired Loans	37,194	44,295	37,021	42,811
Interest Income Recognized	310	298	791	810
Commercial non-owner occupied real estate | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20 | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	187	1,505	187	1,505	1,157
Recorded Investment With No Allowance	85	831	85	831	536
Gross Recorded Investment With Allowance	16	517	16	517	489
Total Recorded Investment	101	1,348	101	1,348	1,025
Related Allowance	1	93	1	93	70
Average Investment In Impaired Loans	238	1,265	563	1,362
Interest Income Recognized	2	9	4	15
Commercial non-owner occupied real estate | Acquired non-credit impaired non-accrual including restructured loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,484	369	1,484	369	535
Commercial non-owner occupied real estate | Acquired non-credit impaired non-accrual including restructured loans | Construction and land development
Loans and Allowance for Loan Losses
Nonaccrual loans	1,207	369	1,207	369	252
Commercial non-owner occupied real estate | Acquired non-credit impaired non-accrual including restructured loans | Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Nonaccrual loans	277		277		283
Commercial owner occupied real estate loan | Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	3,459	1,526	3,459	1,526	1,068
Commercial owner occupied real estate loan | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	6,673	5,733	6,673	5,733	5,085
Recorded Investment With No Allowance	3,833	3,031	3,833	3,031	3,101
Gross Recorded Investment With Allowance	1,607	1,719	1,607	1,719	1,041
Total Recorded Investment	5,440	4,750	5,440	4,750	4,142
Related Allowance	33	44	33	44	27
Average Investment In Impaired Loans	4,830	5,164	4,791	5,196
Interest Income Recognized	94	72	161	147
Commercial owner occupied real estate loan | Acquired non-credit impaired non-accrual including restructured loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,108	885	1,108	885	1,470
Consumer loans | Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	8,428	8,773	8,428	8,773	9,442
Consumer loans | Non acquired non-accrual loans | Home equity loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,740	2,308	1,740	2,308	2,333
Consumer loans | Non acquired non-accrual loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Nonaccrual loans	6,688	6,465	6,688	6,465	7,109
Consumer loans | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20 | Home equity loans
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,566	3,256	2,566	3,256	2,953
Recorded Investment With No Allowance	1,084	1,146	1,084	1,146	1,129
Gross Recorded Investment With Allowance	1,352	1,998	1,352	1,998	1,697
Total Recorded Investment	2,436	3,144	2,436	3,144	2,826
Related Allowance	125	180	125	180	142
Average Investment In Impaired Loans	2,595	3,156	2,631	3,077
Interest Income Recognized	32	36	64	65
Consumer loans | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20 | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	5,989	6,085	5,989	6,085	7,291
Recorded Investment With No Allowance	3,983	4,631	3,983	4,631	4,992
Gross Recorded Investment With Allowance	1,583	997	1,583	997	1,769
Total Recorded Investment	5,566	5,628	5,566	5,628	6,761
Related Allowance	35	30	35	30	41
Average Investment In Impaired Loans	6,226	5,561	6,164	5,630
Interest Income Recognized	44	44	93	87
Consumer loans | Acquired non-credit impaired non-accrual including restructured loans
Loans and Allowance for Loan Losses
Nonaccrual loans	4,722	6,370	4,722	6,370	8,376
Consumer loans | Acquired non-credit impaired non-accrual including restructured loans | Home equity loans
Loans and Allowance for Loan Losses
Nonaccrual loans	3,023	4,234	3,023	4,234	4,512
Consumer loans | Acquired non-credit impaired non-accrual including restructured loans | Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,699	2,136	1,699	2,136	3,864
Commercial and industrial | Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	285	811	285	811	647
Commercial and industrial | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,708	1,876	2,708	1,876	1,332
Recorded Investment With No Allowance	509	724	509	724	467
Gross Recorded Investment With Allowance	2,165	1,110	2,165	1,110	824
Total Recorded Investment	2,674	1,834	2,674	1,834	1,291
Related Allowance	394	485	394	485	416
Average Investment In Impaired Loans	1,994	1,756	1,982	1,495
Interest Income Recognized	66	19	86	36
Commercial and industrial | Acquired non-credit impaired non-accrual including restructured loans
Loans and Allowance for Loan Losses
Nonaccrual loans	964	101	964	101	1,296
Other income producing property | Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	351	323	351	323	500
Other income producing property | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,333	3,473	2,333	3,473	3,117
Recorded Investment With No Allowance	129	234	129	234	150
Gross Recorded Investment With Allowance	1,935	3,006	1,935	3,006	2,722
Total Recorded Investment	2,064	3,240	2,064	3,240	2,872
Related Allowance	78	144	78	144	142
Average Investment In Impaired Loans	2,210	3,163	2,468	3,189
Interest Income Recognized	24	42	54	88
Other income producing property | Acquired non-credit impaired non-accrual including restructured loans
Loans and Allowance for Loan Losses
Nonaccrual loans	228	254	228	254	244
Consumer | Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,351	893	1,351	893	1,267
Consumer | Impaired non-acquired and acquired loans accounted under FASB ASC topic 310-20
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	158	325	158	325	211
Gross Recorded Investment With Allowance	98	257	98	257	188
Total Recorded Investment	98	257	98	257	188
Related Allowance	3	7	3	7	2
Average Investment In Impaired Loans	104	285	144	248
Consumer | Acquired non-credit impaired non-accrual including restructured loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,442	1,394	$ 1,442	1,394	1,568
Restructured loans | ASC Topic 31020 Loans
Loans and Allowance for Loan Losses
Number of months generally required to return to accruing status			6 months
Restructured loans | Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	$ 671	$ 902	$ 671	$ 902	$ 648

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)property	Jun. 30, 2018USD ($)property
OREO
Balance at the beginning of the period	$ 11,410	$ 11,203
Additions	7,632	10,259
Write-downs	(487)	(932)
Sold	(4,049)	(3,518)
Balance at the end of the period	$ 14,506	$ 17,222
Number of properties held | property	69	86
Residential real estate consumer mortgage loans in foreclosure, carrying value	$ 6,300
Park Sterling Corporation
OREO
Acquired		$ 210
Residential real estate
OREO
Other Real Estate In Foreclosure	$ 2,500

Leases (Details)

Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Right to use asset	$ 84,464
Lease liabilities	$ 84,968
Existence of option to extend	true
Renewal term	24 years
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	25 years

Leases - Lease cost and other i

Leases - Lease cost and other information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Lease Expense Components:
Operating lease expense	$ 2,173	$ 4,319
Short-term lease expense	132	276
Variable lease expense	117	186
Total lease expense	2,422	4,781
Supplemental Cash Flow Information Related to Leases:
Cash paid for amounts included in the measurement of lease liabilities - operating leases	1,918	3,808
ROU assets obtained in exchange for new lease liabilities during first quarter 2019- operating leases	$ 2,994	$ 4,950
Weighted - average remaining lease term (years) - Operating leases	14 years 4 months 24 days	14 years 4 months 24 days
Weighted - average discount rate - Operating leases	4.00%	4.00%
Supplemental Balance Sheet Information Related to Leases
Operating lease ROU assets	$ 84,464	$ 84,464
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Operating lease liabilities	$ 84,968	$ 84,968
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities

Leases - Maturities Analysis (D

Leases - Maturities Analysis (Details) $ in Thousands	Jun. 30, 2019USD ($)
Maturity Analysis of Lease Liabilities:
2019 (excluding the six months ended June 30, 2019)	$ 3,796
2020	7,531
2021	7,989
2022	8,007
2023	8,021
Thereafter	78,176
Total	113,520
Less: Imputed Interest	(28,552)
Lease liabilities	$ 84,968

Leases - Leases not yet commenc

Leases - Leases not yet commenced (Details) $ in Millions	Jun. 30, 2019USD ($)
Leases
Additional operating leases that not yet commenced	$ 4.9
Additional operating leases that not yet commenced term (in years)	15 years

Deposits - Total deposits (Deta

Deposits - Total deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Deposits
Certificates of deposit	$ 1,732,554	$ 1,775,095	$ 1,804,657
Interest-bearing demand deposits	5,588,061	5,407,175	5,216,942
Non-interest bearing demand deposits	3,255,906	3,061,769	3,152,828
Savings deposits	1,339,293	1,399,815	1,458,208
Other time deposits	6,466	3,079	5,654
Total deposits	$ 11,922,280	$ 11,646,933	$ 11,638,289

Deposits - Certificates of depo

Deposits - Certificates of deposits and Scheduled maturities of time deposits (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Deposits
Aggregate amounts of certificates of deposits in denominations of $250,000 or more	$ 310.2	$ 320	$ 336.9
Traditional, out-of-market brokered deposits	$ 3.9	$ 7.6	$ 19.8

Retirement Plans - Non-contribu

Retirement Plans - Non-contributory defined benefit pension plan (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Retirement Plans
Pension plan termination expense	$ 9,526	$ 9,526
Recognition of pre-tax losses from pension plan		(7,700)
Write-off of pension plan asset		$ 1,800
Non-contributory defined benefit pension plan | Employees hired on or before December 31, 2005
Retirement Plans
Requisite age of employees for receiving retirement benefits under the plan		21 years
Non-contributory defined benefit pension plan | Employee hired on or after January 1, 2006
Retirement Plans
Requisite age of employees for receiving retirement benefits under the new benefit formula		45 years
Requisite age of employees for receiving retirement benefits under the new benefit formula		5 years

Retirement Plans - Safe Harbor

Retirement Plans - Safe Harbor plan (Details)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019USD ($)	Mar. 31, 2019	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018
Employees' savings plan
Matching contribution by the company (as a percent)						100.00%
Discretionary matching contribution		0.75				2
Expenses recognized under 401(K) plan	$ 1,700,000		$ 896,000	$ 3,000,000	$ 3,300,000
Minimum
Employees' savings plan
Age of employees to be eligible to participate in the defined contribution plan				21 years
Percentage of annual base compensation that participants may elect to contribute				1.00%
Maximum
Employees' savings plan
Percentage of annual base compensation that participants may elect to contribute				50.00%
Percentage of employees salary for which the company contributes a matching contribution						4.00%

Earnings Per Share - Computatio

Earnings Per Share - Computation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic earnings per common share:
Net income	$ 41,460	$ 40,459	$ 85,827	$ 82,785
Weighted-average basic common shares	35,089	36,677	35,268	36,657
Basic earnings per common share (in dollars per share)	$ 1.18	$ 1.10	$ 2.43	$ 2.25
Diluted earnings per share:
Net income	$ 41,460	$ 40,459	$ 85,827	$ 82,785
Weighted-average basic common shares	35,089	36,677	35,268	36,657
Effect of dilutive securities (in shares)	211	252	193	253
Weighted-average dilutive shares	35,300	36,929	35,461	36,910
Diluted earnings per common share (in dollars per share)	$ 1.17	$ 1.09	$ 2.42	$ 2.24

Earnings Per Share - Calculatio

Earnings Per Share - Calculation of diluted EPS under Treasury method (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share
Number of shares	63,313	61,272	63,313	61,272
Range of exercise prices, low end of range (in dollars per share)	$ 69.48	$ 91.05	$ 69.48	$ 91.05
Range of exercise prices, high end of range (in dollars per share)	$ 91.35	$ 91.35	$ 91.35	$ 91.35

Share-Based Compensation - Stoc

Share-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended	89 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2019
Aggregate Intrinsic Value
Outstanding at the end of the period		$ 3,201	$ 3,201
Exercisable at the end of the period		$ 3,137	$ 3,137
Stock Options
Number of shares
Outstanding at the beginning of the period (in shares)		213,866
Exercised (in shares)		(12,722)
Outstanding at the end of the period (in shares)		201,144	201,144
Exercisable at the end of the period (in shares)		155,472	155,472
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 61.28
Exercised (in dollars per share)		31.62
Outstanding at the end of the period (in dollars per share)		63.16	$ 63.16
Exercisable at the end of the period (in dollars per share)		56.07	$ 56.07
Weighted-average fair value of options granted during the year (in dollars per share)		$ 0
Weighted-Average Remaining Contractual Life
Outstanding at the end of the period		5 years 4 months 20 days
Exercisable at the end of the period		4 months 19 days
Restricted Stock | Maximum
Share-Based Compensation
Vesting period		12 months
Restricted Stock | Minimum
Share-Based Compensation
Vesting period		4 years
2012 plan
Share-Based Compensation
Options granted (in shares)	0
2019 plan
Share-Based Compensation
Number of shares registered		1,000,000	1,000,000
2004 plan
Number of shares
Granted (in shares)			0
Plan 2004 And 2012 | Incentive stock options
Share-Based Compensation
Vesting percentage		25.00%
Expiration period		10 years
Plan 2004 And 2012 | Incentive stock options | Maximum
Share-Based Compensation
Vesting period		4 years

Share-Based Compensation - Weig

Share-Based Compensation - Weighted average assumptions used in valuing options (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Stock Options
Share-Based Compensation
Shares issued (in shares)	0
Weighted-average assumptions
Dividend yield (as a percent)		1.46%
Expected life		8 years 6 months
Expected volatility (as a percent)		28.00%
Risk-free interest rate (as a percent)		2.54%
Additional disclosures
Total unrecognized compensation cost related to non vested stock option grants	$ 1,000,000
Weighted-average period over which unrecognized compensation cost is expected to be recognized	1 year 3 months 3 days
Total fair value of shares vested during the period	$ 799,000
Restricted Stock
Additional disclosures
Weighted-average period over which unrecognized compensation cost is expected to be recognized	1 year 6 months 3 days
Total fair value of shares vested during the period	$ 2,100,000
Restricted Stock Activity and RSUs
Nonvested at the beginning of the period (in shares)	104,419
Granted (in shares)	8,934
Vested (in shares)	(26,514)
Forfeited (in shares)	(2,332)
Nonvested at the end of the period (in shares)	84,507
Weighted-Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 62.45
Granted (in dollars per share)	73.34
Vested (in dollars per share)	74.29
Forfeited (in dollars per share)	73.89
Nonvested at the end of the period (in dollars per share)	$ 59.57
Additional disclosures
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted	$ 2,000,000
Restricted Stock | Minimum
Additional disclosures
Vesting period	4 years
Restricted Stock | Maximum
Additional disclosures
Vesting period	12 months
Restricted Stock Units
Additional disclosures
Weighted-average period over which unrecognized compensation cost is expected to be recognized	2 years 21 days
Total fair value of shares vested during the period	$ 2,900,000
Restricted Stock Activity and RSUs
Nonvested at the beginning of the period (in shares)	200,540
Granted (in shares)	152,564
Forfeited (in shares)	(1,651)
Nonvested at the end of the period (in shares)	351,453
Weighted-Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 85.10
Granted (in dollars per share)	67.83
Forfeited (in dollars per share)	89.43
Nonvested at the end of the period (in dollars per share)	$ 77.58
Additional disclosures
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted	$ 13,400,000
Target RSU award level (as a percent)	88.10%
Employee Stock Purchase Plan
Number Of Stock Issued Pursuant To Restricted Stock Units	44,599
Performance based restricted stock units
Additional disclosures
Performance period	3 years
Other Performance based restricted stock units
Additional disclosures
Performance period	1 year
Timed based restricted stock units
Additional disclosures
Performance period	4 years

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Details) $ in Billions	Jun. 30, 2019USD ($)
Commitments and Contingent Liabilities
Commitments to extend credit and standby letters of credit	$ 2.8

Fair Value - Assets and liabili

Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Assets
Derivative financial instruments	$ 14,600
Securities available for sale	1,717,276	$ 1,577,999	$ 1,517,067
Liabilities
Derivative financial instruments	15,800
Government-sponsored entities debt
Assets
Securities available for sale	66,529	47,613	48,251
State and municipal obligations
Assets
Securities available for sale	182,146	223,816	200,768
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	30,332	35,107	34,727
Changes in fair value of assets
Changes in hierarchy classifications of Level 3 liabilities	0
Recurring basis
Assets
Derivative financial instruments	17,587	8,848	5,090
Loans held for sale	47,796	36,968	22,925
Securities available for sale	1,717,276	1,577,999	1,517,067
Mortgage servicing rights	30,332	35,107	34,727
Fair value of Assets, Total	1,812,991	1,658,922	1,579,809
Liabilities
Derivative financial instruments	30,286	8,097	4,421
Recurring basis | Government-sponsored entities debt
Assets
Securities available for sale	66,529	47,613	48,251
Recurring basis | State and municipal obligations
Assets
Securities available for sale	182,146	223,816	200,768
Recurring basis | Mortgage-backed securities
Assets
Securities available for sale	1,468,601	1,306,570	1,268,048
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	17,587	8,848	5,090
Loans held for sale	47,796	36,968	22,925
Securities available for sale	1,717,276	1,577,999	1,517,067
Fair value of Assets, Total	1,782,659	1,623,815	1,545,082
Liabilities
Derivative financial instruments	30,286	8,097	4,421
Recurring basis | Significant Other Observable Inputs (Level 2) | Government-sponsored entities debt
Assets
Securities available for sale	66,529	47,613	48,251
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets
Securities available for sale	182,146	223,816	200,768
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities
Assets
Securities available for sale	1,468,601	1,306,570	1,268,048
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	30,332	35,107	34,727
Fair value of Assets, Total	30,332	35,107	$ 34,727
Changes in fair value of assets
Fair value of assets at the beginning of the period	34,727	31,119
Servicing assets that resulted from transfers of financial assets	2,558	3,112
Change in unrealized loss recognized in other comprehensive income	0	0
Changes in fair value assets due to valuation inputs or assumptions	(4,924)	2,945
Changes in fair value due to decay	2,029	2,069
Fair value of assets at the end of the period	30,332	35,107
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities	$ 0	$ 0

Fair Value - Assets and liabi_2

Fair Value - Assets and liabilities measured at fair value on a nonrecurring basis (Details) - Nonrecurring basis $ in Thousands	Jun. 30, 2019USD ($)item	Dec. 31, 2018USD ($)item	Jun. 30, 2018USD ($)item
OREO | Fair Value
Fair Value
Other Real Estate	$ 14,506	$ 11,410	$ 17,222
Non-acquired impaired loans | Fair Value
Fair Value
Other Real Estate	$ 4,946	$ 13,164	$ 5,909
Significant Unobservable Inputs (Level 3) | Impaired loans
Quantitative Information about Level 3 Fair Value Measurements
Long-term Debt, Valuation Technique [Extensible List]	us-gaap:MarketApproachValuationTechniqueMember	us-gaap:MarketApproachValuationTechniqueMember	us-gaap:MarketApproachValuationTechniqueMember
Long-term Debt, Measurement Input [Extensible List]	us-gaap:MeasurementInputDiscountRateMember	us-gaap:MeasurementInputDiscountRateMember	us-gaap:MeasurementInputDiscountRateMember
Significant Unobservable Inputs (Level 3) | Impaired loans | Weighted average
Quantitative Information about Level 3 Fair Value Measurements
Discount rate (as a percent) | item	0.03	0.03	0.03
Significant Unobservable Inputs (Level 3) | OREO
Fair Value
Other Real Estate	$ 14,506	$ 11,410	$ 17,222
Quantitative Information about Level 3 Fair Value Measurements
Long-term Debt, Valuation Technique [Extensible List]	us-gaap:MarketApproachValuationTechniqueMember	us-gaap:MarketApproachValuationTechniqueMember	us-gaap:MarketApproachValuationTechniqueMember
Long-term Debt, Measurement Input [Extensible List]	us-gaap:MeasurementInputCostToSellMember	us-gaap:MeasurementInputCostToSellMember	us-gaap:MeasurementInputCostToSellMember
Significant Unobservable Inputs (Level 3) | OREO | Weighted average
Quantitative Information about Level 3 Fair Value Measurements
Discount rate (as a percent) | item	0.22	0.23	0.17
Significant Unobservable Inputs (Level 3) | Non-acquired impaired loans
Fair Value
Other Real Estate	$ 4,946	$ 13,164	$ 5,909

Fair Value - Estimated fair val

Fair Value - Estimated fair value and related carrying amount, of the Company's financial instruments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financial assets:
Loans held for sale	$ 47,796	$ 36,968	$ 22,925
Financial liabilities:
Federal Funds Purchased and Securities Sold under Agreements to Repurchase.	298,029	331,969	270,649
Increase (Decrease) in Loans Held-for-sale	214,785	207,909
Other borrowings	816,414	115,754	266,084
Carrying Amount
Financial assets:
Cash and cash equivalents	851,971	396,849	408,983
Investment securities	1,766,400	1,597,727	1,542,671
Loans held for sale	47,796	36,968	22,925
Loans, net of allowance for loan losses (1)	11,167,979	10,778,068	10,962,037
Accrued interest receivable	38,650	33,751	35,997
Mortgage servicing rights	30,332	35,107	34,727
Interest rate swap - non-designated hedge	14,561	7,750	3,824
Other derivative financial instruments (mortgage banking related)	3,026	1,098	1,267
Financial liabilities:
Deposits	11,922,280	11,638,289	11,646,933
Federal Funds Purchased and Securities Sold under Agreements to Repurchase.	298,029	331,969	270,649
Other borrowings	816,414	115,754	266,084
Accrued interest payable	6,168	3,882	4,719
Interest rate swap - non-designated hedge	15,952	7,981	4,373
Interest rate swap - cash flow hedge	14,334	116	48
Fair Value
Financial assets:
Cash and cash equivalents	851,971	396,849	408,983
Investment securities	1,766,400	1,597,731	1,542,671
Loans held for sale	47,796	36,968	22,925
Loans, net of allowance for loan losses (1)	11,278,624	10,547,778	10,613,571
Accrued interest receivable	38,650	33,751	35,997
Mortgage servicing rights	30,332	35,107	34,727
Interest rate swap - non-designated hedge	14,561	7,750	3,824
Other derivative financial instruments (mortgage banking related)	3,026	1,098	1,267
Financial liabilities:
Deposits	11,124,796	10,675,705	10,561,394
Federal Funds Purchased and Securities Sold under Agreements to Repurchase.	298,029	331,969	270,649
Other borrowings	819,306	119,221	269,134
Accrued interest payable	6,168	3,882	4,719
Interest rate swap - non-designated hedge	15,952	7,981	4,373
Interest rate swap - cash flow hedge	14,334	116	48
Commitments to extend credit | Fair Value
Financial liabilities:
Commitments to extend credit	27,579	(62,060)	(88,424)
Quoted Prices In Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	851,971	396,849	408,983
Investment securities	49,124	19,229	25,604
Significant Other Observable Inputs (Level 2)
Financial assets:
Investment securities	1,717,276	1,578,502	1,517,067
Loans held for sale	47,796	36,968	22,925
Accrued interest receivable	7,880	7,333	6,908
Interest rate swap - non-designated hedge	14,561	7,750	3,824
Other derivative financial instruments (mortgage banking related)	3,026	1,098	1,267
Financial liabilities:
Deposits	11,124,796	10,675,705	10,561,394
Federal Funds Purchased and Securities Sold under Agreements to Repurchase.	298,029	331,969	270,649
Other borrowings	819,306	119,221	269,134
Accrued interest payable	6,168	3,882	4,719
Interest rate swap - non-designated hedge	15,952	7,981	4,373
Interest rate swap - cash flow hedge	14,334	116	48
Significant Other Observable Inputs (Level 2) | Commitments to extend credit
Financial liabilities:
Commitments to extend credit	27,579	(62,060)	(88,424)
Significant Unobservable Inputs (Level 3)
Financial assets:
Loans, net of allowance for loan losses (1)	11,278,624	10,547,778	10,613,571
Accrued interest receivable	30,770	26,418	29,089
Mortgage servicing rights	$ 30,332	$ 35,107	$ 34,727

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period			$ (24,881)
Other comprehensive income (loss), net of tax	$ 14,840	$ (5,721)	26,347	$ (22,697)
Balance at the end of the period	1,466	(36,071)	1,466	(36,071)
Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(6,355)	(7,607)	(6,450)	(5,998)
Amounts reclassified from accumulated other comprehensive income (loss)	6,058	151	6,153	302
Other comprehensive income (loss), net of tax	6,058	151	6,153	302
AOCI reclassification to retained earnings from adoption of ASU 2018-02				(1,760)
Balance at the end of the period	(297)	(7,456)	(297)	(7,456)
Unrealized Gains and Losses on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(4,906)	(22,617)	(18,394)	(4,278)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	19,183	(6,409)	33,092	(23,601)
Amounts reclassified from accumulated other comprehensive income (loss)	(1,333)	500	(1,754)	500
Other comprehensive income (loss), net of tax	17,850	(5,909)	31,338	(23,101)
AOCI reclassification to retained earnings from adoption of ASU 2018-02				(1,147)
Balance at the end of the period	12,944	(28,526)	12,944	(28,526)
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(2,113)	(126)	(37)	(151)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(8,795)	6	(10,876)	34
Amounts reclassified from accumulated other comprehensive income (loss)	(273)	31	(268)	68
Other comprehensive income (loss), net of tax	(9,068)	37	(11,144)	102
AOCI reclassification to retained earnings from adoption of ASU 2018-02				(40)
Balance at the end of the period	(11,181)	(89)	(11,181)	(89)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(13,374)	(30,350)	(24,881)	(10,427)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	10,388	(6,403)	22,216	(23,567)
Amounts reclassified from accumulated other comprehensive income (loss)	4,452	682	4,131	870
Other comprehensive income (loss), net of tax	14,840	(5,721)	26,347	(22,697)
AOCI reclassification to retained earnings from adoption of ASU 2018-02				(2,947)
Balance at the end of the period	$ 1,466	$ (36,071)	$ 1,466	$ (36,071)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassifications out of accumulated other comprehensive income, net of tax
Interest expense	$ (22,803)	$ (12,170)	$ (42,926)	$ (21,245)
Provision for income taxes	(10,226)	(11,644)	(21,457)	(22,929)
Net income	41,460	40,459	85,827	82,785
Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Net income	4,452	682	4,131	870
Gains and Losses on Cash Flow Hedges | Amount Reclassified from Accumulated Other Comprehensive Loss | Interest rate contracts
Reclassifications out of accumulated other comprehensive income, net of tax
Interest expense	(350)	39	(343)	87
Provision for income taxes	77	(8)	75	(19)
Net income	(273)	31	(268)	68
Unrealized Gains and Losses on Securities Available for Sale | Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Securities (gains) losses, net	(1,709)	641	(2,250)	641
Provision for income taxes	376	(141)	496	(141)
Net income	(1,333)	500	(1,754)	500
Benefit Plans | Amount Reclassified from Accumulated Other Comprehensive Loss
Reclassifications out of accumulated other comprehensive income, net of tax
Salaries and employee benefits	7,767	194	7,888	387
Provision for income taxes	(1,709)	(43)	(1,735)	(85)
Net income	$ 6,058	$ 151	$ 6,153	$ 302

Derivative Financial Instrume_3

Derivative Financial Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2009
Derivative Financial Instruments
Notional Amount	$ 1,802,159,000	$ 826,004,000	$ 1,802,159,000	$ 826,004,000
Estimated Fair Value Gain			17,587,000	8,848,000
Estimated Fair Value Loss			$ 30,286,000	8,097,000
Variable rate basis, variable rate receivable on notional amount			three-month LIBOR
After-tax unrealized gain on cash flow hedge in other comprehensive income	9,100,000	37,000	$ 11,100,000	102,000
Ineffectiveness in the cash flow hedge	0	0	0	0
Gain or loss recorded	0	0	0	0
Interest Rate Derivative Assets, at Fair Value	14,600,000		14,600,000
Interest Rate Derivative Liabilities, at Fair Value	15,800,000		15,800,000
Interest Rate Derivatives, at Fair Value, Net	1,200,000	240,000	1,200,000	240,000
Estimated gain (loss) on fair value of open contracts related to mortgage servicing rights			1,800,000	(291,000)
Junior Subordinated Debt
Derivative Financial Instruments
Collateral provided	0	300,000	0	300,000
FHLB Advances
Derivative Financial Instruments
Collateral provided	22,800,000		22,800,000
Other Liabilities.
Derivative Financial Instruments
Cash flow hedge liability	14,300,000	116,000	14,300,000	116,000
Mortgage loan pipeline
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	117,144,000	89,085,000	117,144,000	89,085,000		$ 50,442,000
Expected closures
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	87,858,000	66,813,000	87,858,000	66,813,000		37,832,000
Cash flow hedge | Borrower
Derivative Financial Instruments
Collateral provided	43,300,000		43,300,000
Cash flow hedge | FHLB Advances - One
Derivative Financial Instruments
Notional Amount					$ 350,000,000
Outstanding advances					350,000,000
Cash flow hedge | FHLB Advances - Two
Derivative Financial Instruments
Notional Amount					150,000,000
Outstanding advances					150,000,000
Cash flow hedge | FHLB Advances - Three
Derivative Financial Instruments
Notional Amount	200,000,000		200,000,000
Interest rate contracts
Derivative Financial Instruments
Notional Amount	865,900,000	654,100,000	865,900,000	654,100,000
Mortgage servicing rights hedging | Non-designated hedges
Derivative Financial Instruments
Notional Amount	139,500,000	63,500,000	139,500,000	63,500,000
Mortgage servicing rights hedging | Non-designated hedges | Other Assets.
Derivative Financial Instruments
Notional Amount	139,500,000	63,500,000	139,500,000	63,500,000
Estimated Fair Value Gain			1,834,000	291,000
Mortgage loan pipeline commitments
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	1,878,000	1,159,000	1,878,000	1,159,000		705,000
Forward commitments
Obligation under forward commitments, the fair value of those obligations along with the fair value of derivative instruments associated with forward commitments
Obligation	93,949,000	92,584,000	93,949,000	92,584,000		54,533,000
Fair value of forward commitments	686,000	352,000	686,000	352,000		$ 621,000
Forward commitments | Non-designated hedges | Other Assets.
Derivative Financial Instruments
Notional Amount	93,949,000	92,584,000	93,949,000	92,584,000
Estimated Fair Value Gain			1,192,000	807,000
Foreign exchange swaps | Non-designated hedges | Other Assets.
Derivative Financial Instruments
Notional Amount		2,521,000		2,521,000
Estimated Fair Value Loss				34,000
Foreign exchange swaps | Non-designated hedges | Other Liabilities.
Derivative Financial Instruments
Notional Amount		2,521,000		2,521,000
Estimated Fair Value Gain				34,000
Interest rate swap | LIBOR
Derivative Financial Instruments
Notional Amount	$ 8,000,000		$ 8,000,000
Interest rate swap | Cash flow hedge
Derivative Financial Instruments
Notional Amount							$ 8,000,000
Interest rate swap | Cash flow hedge | FHLB Advances - One
Derivative Financial Instruments
Notional Amount					350,000,000
Fixed rate payable on notional amount (as a percent)	2.44%		2.44%
Interest rate swap | Cash flow hedge | FHLB Advances - Two
Derivative Financial Instruments
Notional Amount					$ 150,000,000
Fixed rate payable on notional amount (as a percent)	2.21%		2.21%
Interest rate swap | Cash flow hedge | FHLB Advances - Three
Derivative Financial Instruments
Notional Amount	$ 200,000,000		$ 200,000,000
Fixed rate payable on notional amount (as a percent)	1.89%		1.89%
Interest rate swap | Cash flow hedge | Other Liabilities. | Counterparty
Derivative Financial Instruments
Notional Amount		8,000,000		8,000,000
Estimated Fair Value Loss				116,000
Interest rate swap | Cash flow hedge | Other Assets and Other Liabilities | FHLB Advances | Counterparty
Derivative Financial Instruments
Notional Amount	$ 700,000,000		$ 700,000,000
Estimated Fair Value Loss			$ 14,334,000
Interest rate swap | Cash flow hedge | LIBOR
Derivative Financial Instruments
Fixed rate payable on notional amount (as a percent)	4.06%		4.06%
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - One
Derivative Financial Instruments
Variable rate (as a percent)	2.39%		2.39%
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Two
Derivative Financial Instruments
Variable rate (as a percent)	2.33%		2.33%
Interest rate swap | Cash flow hedge | LIBOR | FHLB Advances - Three
Derivative Financial Instruments
Variable rate (as a percent)	2.52%		2.52%
Interest rate swap | Fair Value Hedging | Counterparty
Derivative Financial Instruments
Notional Amount	$ 2,800,000		$ 2,800,000
Interest rate swap | Fair Value Hedging | Other Assets. | Counterparty
Derivative Financial Instruments
Notional Amount	2,784,000	2,824,000	2,784,000	2,824,000
Estimated Fair Value Gain				8,000
Estimated Fair Value Loss			197,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Borrower
Derivative Financial Instruments
Notional Amount	432,963,000	327,027,000	432,963,000	327,027,000
Estimated Fair Value Gain			14,561,000	437,000
Estimated Fair Value Loss			478,000	7,947,000
Interest rate swap | Non-designated hedges | Other Assets and Other Liabilities | Counterparty
Derivative Financial Instruments
Notional Amount	432,963,000	$ 327,027,000	432,963,000	327,027,000
Estimated Fair Value Gain				$ 7,271,000
Estimated Fair Value Loss			15,277,000
Foreign exchange contract
Derivative Financial Instruments
Notional Amount	$ 2,500,000		$ 2,500,000

Capital Ratios (Details)

Capital Ratios (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018
Capital ratios
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)		2.50%
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 1,323,535		$ 1,335,826	$ 1,324,901
Actual, Ratio (as a percent)	11.58%		12.05%	12.00%
Minimum capital required, Ratio (as a percent)	4.50%
Required to be considered well capitalized, Capital Amount	$ 742,959		$ 720,844	$ 718,070
Required to be considered well capitalized, Ratio (as a percent)	6.50%		6.50%	6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount	$ 1,435,471		$ 1,447,428	$ 1,436,170
Actual, Ratio (as a percent)	12.56%		13.05%	13.00%
Minimum capital required, Ratio (as a percent)	6.00%		4.00%
Required to be considered well capitalized, Capital Amount	$ 914,411		$ 887,192	$ 883,779
Required to be considered well capitalized, Ratio (as a percent)	8.00%		8.00%	8.00%
Total capital to risk-weighted assets
Actual, Capital Amount	$ 1,494,019		$ 1,503,561	$ 1,488,805
Actual, Ratio (as a percent)	13.07%		13.56%	13.48%
Minimum capital required, Ratio (as a percent)	8.00%
Required to be considered well capitalized, Capital Amount	$ 1,143,013		$ 1,108,990	$ 1,104,723
Required to be considered well capitalized, Ratio (as a percent)	10.00%		10.00%	10.00%
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount	$ 1,435,471		$ 1,447,428	$ 1,436,170
Actual, Ratio (as a percent)	9.99%		10.65%	10.62%
Minimum capital required, Ratio (as a percent)	4.00%
Required to be considered well capitalized, Capital Amount	$ 718,675		$ 679,383	$ 676,086
Required to be considered well capitalized, Ratio (as a percent)	5.00%		5.00%	5.00%
Phase-In Schedule
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount	$ 800,109		$ 706,981	$ 704,261
Minimum capital required, Ratio (as a percent)	7.00%		6.38%	6.38%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 971,561		$ 873,330	$ 869,970
Minimum capital required, Ratio (as a percent)	8.50%		7.88%	7.88%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 1,200,164		$ 1,095,128	$ 1,090,914
Minimum capital required, Ratio (as a percent)	10.50%		9.88%	9.88%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount	$ 574,940		$ 543,506	$ 540,869
Minimum capital required, Ratio (as a percent)	4.00%		4.00%	4.00%
Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount	$ 800,109		$ 776,293	$ 773,306
Minimum capital required, Ratio (as a percent)	7.00%		7.00%	7.00%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 971,561		$ 942,642	$ 939,015
Minimum capital required, Ratio (as a percent)	8.50%		8.50%	8.50%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 1,200,164		$ 1,164,440	$ 1,159,960
Minimum capital required, Ratio (as a percent)	10.50%		10.50%	10.50%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount	$ 574,940		$ 543,506	$ 540,869
Minimum capital required, Ratio (as a percent)	4.00%		4.00%	4.00%
South State Bank (the Bank)
Common equity Tier 1 to risk-weighted assets
Actual, Capital Amount	$ 1,419,395		$ 1,427,764	$ 1,413,812
Actual, Ratio (as a percent)	12.42%		12.87%	12.80%
Required to be considered well capitalized, Capital Amount	$ 742,971		$ 720,902	$ 718,084
Required to be considered well capitalized, Ratio (as a percent)	6.50%		6.50%	6.50%
Tier I capital to risk-weighted assets
Actual, Capital Amount	$ 1,419,395		$ 1,427,764	$ 1,413,812
Actual, Ratio (as a percent)	12.42%		12.87%	12.80%
Required to be considered well capitalized, Capital Amount	$ 914,426		$ 887,264	$ 883,796
Required to be considered well capitalized, Ratio (as a percent)	8.00%		8.00%	8.00%
Total capital to risk-weighted assets
Actual, Capital Amount	$ 1,477,943		$ 1,483,897	$ 1,466,447
Actual, Ratio (as a percent)	12.93%		13.38%	13.27%
Required to be considered well capitalized, Capital Amount	$ 1,143,033		$ 1,109,080	$ 1,104,745
Required to be considered well capitalized, Ratio (as a percent)	10.00%		10.00%	10.00%
Tier I capital to average assets (leverage ratio)
Actual, Capital Amount	$ 1,419,395		$ 1,427,764	$ 1,413,812
Actual, Ratio (as a percent)	9.88%		10.51%	10.46%
Required to be considered well capitalized, Capital Amount	$ 718,475		$ 679,234	$ 675,907
Required to be considered well capitalized, Ratio (as a percent)	5.00%		5.00%	5.00%
South State Bank (the Bank) | Phase-In Schedule
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount	$ 800,123		$ 707,039	$ 704,275
Minimum capital required, Ratio (as a percent)	7.00%		6.38%	6.38%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 971,578		$ 873,401	$ 869,986
Minimum capital required, Ratio (as a percent)	8.50%		7.88%	7.88%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 1,200,184		$ 1,095,217	$ 1,090,935
Minimum capital required, Ratio (as a percent)	10.50%		9.88%	9.88%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount	$ 574,780		$ 543,387	$ 540,726
Minimum capital required, Ratio (as a percent)	4.00%		4.00%	4.00%
South State Bank (the Bank) | Fully Phased-In
Common equity Tier 1 to risk-weighted assets
Minimum capital required, Capital Amount	$ 800,123		$ 776,356	$ 773,321
Minimum capital required, Ratio (as a percent)	7.00%		7.00%	7.00%
Tier I capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 971,578		$ 942,718	$ 939,033
Minimum capital required, Ratio (as a percent)	8.50%		8.50%	8.50%
Total capital to risk-weighted assets
Minimum capital required, Capital Amount	$ 1,200,184		$ 1,164,534	$ 1,159,982
Minimum capital required, Ratio (as a percent)	10.50%		10.50%	10.50%
Tier I capital to average assets (leverage ratio)
Minimum capital required, Capital Amount	$ 574,780		$ 543,387	$ 540,726
Minimum capital required, Ratio (as a percent)	4.00%		4.00%	4.00%

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Goodwill and Other Intangible Assets
Goodwill	$ 1,002,900	$ 1,002,900	$ 1,002,722

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Other intangible assets
Gross carrying amount	$ 119,501	$ 121,736	$ 119,501	$ 121,736	$ 121,736
Accumulated amortization	(63,150)	(51,761)	(63,150)	(51,761)	(58,836)
Net carrying amount	56,351	69,975	56,351	69,975	62,900
Amortization expense	3,268	3,722	6,549	7,135
Estimated amortization expense for other intangibles for each of the next five quarters
September 30, 2019	3,268		3,268
December 31, 2019	3,267		3,267
March 31, 2020	3,007		3,007
June 30, 2020	2,995		2,995
September 30, 2020	2,945		2,945
Thereafter	40,869		40,869
Net carrying amount	$ 56,351	$ 69,975	$ 56,351	$ 69,975	$ 62,900
Minimum
Other intangible assets
Estimated useful lives			2 years
Maximum
Other intangible assets
Estimated useful lives			15 years

Loan Servicing, Mortgage Orig_3

Loan Servicing, Mortgage Origination, and Loans Held for Sale (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
MSRs
Changes in the fair value of MSRs and its offsetting hedge.
Increase (decrease) in fair value of MSRs	$ (2,568,000)	$ 429,000	$ (4,924,000)	$ 2,945,000
Decay of MSRs	(1,143,000)	(1,141,000)	(2,029,000)	(2,069,000)
Gains (loss) related to derivatives	2,659,000	(339,000)	3,940,000	(1,893,000)
Net effect on statements of income	(1,052,000)	(1,051,000)	$ (3,013,000)	$ (1,017,000)
Characteristics and sensitivity analysis of the MSR
Composition of residential loans serviced for others						100.00%	100.00%	100.00%
Weighted average life (in years)			6 years 6 months 14 days	8 years 6 months 21 days	7 years 10 months 17 days
Constant Prepayment rate (CPR) (as a percent)			10.10%	6.10%	7.30%
Weighted average discount rate (as a percent)			9.40%	9.40%	9.40%
Effect on fair value due to change in interest rates:
25 basis point increase						$ 2,517,000	$ 1,504,000	$ 934,000
50 basis point increase						4,621,000	2,740,000	1,626,000
25 basis point decrease						(2,575,000)	(1,981,000)	(1,379,000)
50 basis point decrease						(5,540,000)	$ (4,421,000)	(3,112,000)
Custodial escrow balances maintained in connection with the loan servicing						$ 27,700,000		$ 26,000,000
Fixed-rate mortgage loans
Characteristics and sensitivity analysis of the MSR
Composition of residential loans serviced for others						99.80%	99.80%	99.70%
Adjustable-rate mortgage loans
Characteristics and sensitivity analysis of the MSR
Composition of residential loans serviced for others						0.20%	0.20%	0.30%
First Financial Holdings, Inc. ("First Financial")
Loans held for sale, loan servicing and mortgage origination
Residential mortgages serviced for others						$ 3,100,000,000	$ 3,100,000,000	$ 3,000,000,000
Contractually specified servicing fees earned	2,000,000	1,900,000	$ 3,900,000	$ 3,800,000
First Financial Holdings, Inc. ("First Financial") | MSRs
Loans held for sale, loan servicing and mortgage origination
Mortgage servicing rights	32,300,000	35,100,000	32,300,000	35,100,000	$ 34,700,000	$ 32,300,000	$ 34,700,000	$ 35,100,000
Analysis of the activity in the MSRs
Balance at beginning of the period			34,700,000
Balance at end of period	$ 32,300,000	$ 35,100,000	$ 32,300,000	$ 35,100,000	$ 34,700,000

Loan Servicing, Mortgage Orig_4

Loan Servicing, Mortgage Origination, and Loans Held for Sale - Mandatory cash forwards (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loan sales	$ 186,500	$ 173,700	$ 301,700	$ 328,500
Loan securitizations and loan sales	$ 147,300	$ 134,600	$ 236,500	$ 253,000
Percentage of loan securitizations and loan sales	79.00%	77.50%	78.40%	77.00%
Loans held for sale	$ 47,796	$ 36,968	$ 47,796	$ 36,968	$ 22,925
Residential mortgage loans to be sold in secondary market
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loans held for sale	$ 47,800	$ 37,000	$ 47,800	$ 37,000	$ 22,900
Residential mortgage loans awaiting sale in secondary market | Minimum
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loans held for sale, settlement period			15 days
Residential mortgage loans awaiting sale in secondary market | Maximum
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loans held for sale, settlement period			45 days

Investments in Qualified Affo_2

Investments in Qualified Affordable Housing Projects (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Investment In Qualified Affordable Housing Projects.
Tax credits and other tax benefits	$ 3.1	$ 2.4
Amortization	3.2	2
Carrying value	72.2	37.6
Original investment value	89.2	89.2
Funding obligation	39.7	$ 16.9
Amount repaid	$ 0

Repurchase Agreements (Details)

Repurchase Agreements (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Secured Debt, Repurchase Agreements
Carrying amount of securities sold under repurchase agreements with customers	$ 260.4	$ 205.3	$ 243.1
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 260.4	$ 205.3	$ 243.1

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jul. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Subsequent events
Cost of shares repurchased		$ 1,963	$ 1,726
2019 Stock Repurchase Program
Subsequent events
Shares authorized under repurchase program		2,000,000
Subsequent event | 2019 Stock Repurchase Program
Subsequent events
Number of shares repurchased	594,400
Share Price	$ 75.05
Cost of shares repurchased	$ 44,600
Additional shares available for repurchase	1,264,400