Enterprise Financial Services (EFSC) 10-Q 23 Oct 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 21, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-15373
Entity Registrant Name	ENTERPRISE FINANCIAL SERVICES CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	43-1706259
Entity Address, Address Line One	150 North Meramec
Entity Address, City or Town	Clayton
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63105
City Area Code	314
Local Phone Number	725-5500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	EFSC
Security Exchange Name	NASDAQ
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		26,209,739
Entity Central Index Key	0001025835
Document Period End Date	Sep. 30, 2020
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 98,816	$ 74,769
Federal funds sold	1,204	3,060
Interest-earning deposits (including $45,525 and $15,285 pledged as collateral, respectively)	292,195	89,427
Total cash and cash equivalents	392,215	167,256
Interest-earning deposits greater than 90 days	8,374	3,730
Securities available-for-sale	1,005,426	1,135,317
Debt Securities, Held-To-Maturity, Net Of Allowance For Credit Losses	327,049	181,166
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group	14,032	5,570
Loans	6,126,307	5,314,337
Less: Allowance for credit losses on loans	123,270	43,288
Total loans, net	6,003,037	5,271,049
Other investments	43,456	38,044
Fixed assets, net	56,807	60,013
Goodwill	210,344	210,344
Intangible assets, net	21,820	26,076
Other assets	285,416	235,226
Total assets	8,367,976	7,333,791
Liabilities and Shareholders' Equity
Noninterest-bearing deposit accounts	1,929,540	1,327,348
Interest-bearing transaction accounts	1,499,756	1,367,444
Money market accounts	2,019,222	1,713,615
Savings accounts	615,663	536,169
Certificates of deposit:
Brokered	65,209	215,758
Other	546,836	610,689
Total deposits	6,676,226	5,771,023
Subordinated debentures and notes	203,510	141,258
FHLB advances	250,000	222,406
Other borrowings	209,038	230,886
Notes payable	30,000	34,286
Other liabilities	116,935	66,747
Total liabilities	7,485,709	6,466,606
Shareholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; 0 shares issued and outstanding	0	0
Common stock, $0.01 par value; 45,000,000 shares authorized; 28,189,670 and 28,067,087 shares issued, respectively	282	281
Treasury stock, at cost; 1,980,093 and 1,523,842 shares, respectively	(73,528)	(58,181)
Additional paid in capital	529,105	526,599
Retained earnings	393,900	380,737
Accumulated other comprehensive income	32,508	17,749
Total shareholders' equity	882,267	867,185
Total liabilities and shareholders' equity	$ 8,367,976	$ 7,333,791

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Collateral pledged	$ 45,525	$ 15,285
Shareholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	28,189,670	28,067,087
Treasury stock, shares	1,980,093	1,523,842

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Interest and fees on loans	$ 62,648	$ 71,214	$ 194,295	$ 201,867
Interest on debt securities:
Taxable	5,554	8,004	19,698	21,236
Nontaxable	2,241	969	5,542	2,277
Interest on interest-earning deposits	113	572	500	1,722
Dividends on equity securities	231	319	631	794
Total interest income	70,787	81,078	220,666	227,896
Interest expense:
Interest Expense, Deposits	3,712	13,209	17,983	38,148
Subordinated debentures and notes	2,826	1,956	7,061	5,562
FHLB advances	720	2,203	2,070	5,297
Notes payable and other borrowings	175	664	997	1,785
Total interest expense	7,433	18,032	28,111	50,792
Net interest income	63,354	63,046	192,555	177,104
Provision for credit losses	14,080	1,833	55,935	5,031
Net interest income after provision for credit losses	49,274	61,213	136,620	172,073
Noninterest income:
Total noninterest income	12,629	13,564	35,997	34,758
Noninterest expense:
Employee compensation and benefits	22,040	20,845	66,114	60,884
Occupancy	3,408	3,179	9,940	9,004
Data processing	2,167	2,051	6,393	6,415
Professional fees	755	1,064	2,904	2,847
Merger-related expenses	1,563	393	1,563	17,969
Other	9,591	10,707	29,195	30,012
Total noninterest expense	39,524	38,239	116,109	127,131
Income before income tax expense	22,379	36,538	56,508	79,700
Income tax expense	4,428	7,469	11,055	16,051
Net income	$ 17,951	$ 29,069	$ 45,453	$ 63,649
Earnings per common share
Basic (usd per share)	$ 0.68	$ 1.09	$ 1.73	$ 2.46
Diluted (usd per share)	$ 0.68	$ 1.08	$ 1.73	$ 2.45
Deposit Account [Member]
Noninterest income:
Total noninterest income	$ 2,798	$ 3,246	$ 8,557	$ 9,547
Fiduciary and Trust [Member]
Noninterest income:
Total noninterest income	2,456	2,661	7,283	7,314
Card Services Revenue [Member]
Noninterest income:
Total noninterest income	2,498	2,494	6,970	6,745
Tax credit activity, net [Member]
Noninterest income:
Total noninterest income	748	1,238	2,563	1,968
Financial Service, Other [Member]
Noninterest income:
Total noninterest income	$ 4,129	$ 3,925	$ 10,624	$ 9,184

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 17,951	$ 29,069	$ 45,453	$ 63,649
Other comprehensive income (loss), after-tax:
Change in unrealized gain on available-for-sale debt securities	94	7,018	21,642	31,362
Reclassification adjustment for realized gain on sale of available-for-sale debt securities	(314)	(254)	(317)	(34)
Reclassification of (gain) loss on held-to-maturity securities	(705)	10	(1,190)	15
Change in unrealized gain (loss) on cash flow hedges arising during the period	110	(669)	(6,247)	(2,886)
Reclassification of loss on cash flow hedges	514	32	871	36
Total other comprehensive income (loss), after-tax	(301)	6,137	14,759	28,493
Comprehensive income	$ 17,650	$ 35,206	$ 60,212	$ 92,142

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance at Dec. 31, 2018	$ 603,804	$ 239	$ (42,655)	$ 350,936	$ 304,566	$ (9,282)
Net income	63,649	0	0	0	63,649	0
Other comprehensive income	28,493	0	0	0	0	28,493
Comprehensive income	92,142	0	0	0	63,649	28,493
Cash dividends paid on common shares	(12,055)	0	0	0	(12,055)	0
Repurchase of common stock	(11,817)	0	(11,817)	0	0	0
Issuance under equity compensation plans, net	(880)	1	0	(881)	0	0
Share-based Payment Arrangement, Noncash Expense	3,016	0	0	3,016	0	0
Shares issued in connection with acquisition	171,885	40	0	171,845	0	0
Ending balance at Sep. 30, 2019	846,095	280	(54,472)	524,916	356,160	19,211
Beginning balance at Jun. 30, 2019	825,501	280	(42,655)	523,454	331,348	13,074
Net income	29,069	0	0	0	29,069	0
Other comprehensive income	6,137	0	0	0	0	6,137
Comprehensive income	35,206	0	0	0	29,069	6,137
Cash dividends paid on common shares	(4,257)	0	0	0	4,257	0
Repurchase of common stock	(11,817)	0	(11,817)	0	0	0
Issuance under equity compensation plans, net	353	0	0	353	0	0
Share-based Payment Arrangement, Noncash Expense	1,109	0	0	1,109	0	0
Ending balance at Sep. 30, 2019	846,095	280	(54,472)	524,916	356,160	19,211
Beginning balance at Dec. 31, 2019	867,185	281	(58,181)	526,599	380,737	17,749
Net income	45,453	0	0	0	45,453	0
Other comprehensive income	14,759	0	0	0	0	14,759
Comprehensive income	60,212	0	0	0	45,453	14,759
Cash dividends paid on common shares	(14,176)	0	0	0	(14,176)	0
Repurchase of common stock	(15,347)	0	(15,347)	0	0	0
Issuance under equity compensation plans, net	(562)	1	0	(563)	0	0
Share-based Payment Arrangement, Noncash Expense	3,069	0	0	3,069	0	0
Reclassification for the adoption of new accounting standards	(18,114)	0	0	0	(18,114)	0
Ending balance at Sep. 30, 2020	882,267	282	(73,528)	529,105	393,900	32,508
Beginning balance at Jun. 30, 2020	867,963	281	(73,528)	527,734	380,667	32,809
Net income	17,951	0	0	0	17,951	0
Other comprehensive income	(301)	0	0	0	0	(301)
Comprehensive income	17,650	0	0	0	17,951	(301)
Cash dividends paid on common shares	(4,718)	0	0	0	(4,718)	0
Issuance under equity compensation plans, net	332	1	0	331	0	0
Share-based Payment Arrangement, Noncash Expense	1,040	0	0	1,040	0	0
Ending balance at Sep. 30, 2020	$ 882,267	$ 282	$ (73,528)	$ 529,105	$ 393,900	$ 32,508

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash dividends paid on common shares, per share	$ 0.54	$ 0.45
Issuance under equity compensation plans, shares	122,583	112,812

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Cash flows from operating activities:
Net income	$ 45,453	$ 63,649
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	4,573	4,187
Provision for credit losses	55,935	5,031
Deferred income taxes	(9,609)	4,777
Net amortization of debt securities	4,775	2,009
Amortization of intangible assets	4,256	3,993
Gain (Loss) on Sale of Debt Investments	(421)	(45)
Mortgage loans originated-for-sale	(164,151)	(39,260)
Proceeds from mortgage loans sold	157,377	33,503
Sale of other real estate	13	(59)
Sale of state tax credits	(290)	(469)
Share-based Payment Arrangement, Noncash Expense	3,069	3,016
Net accretion of loan discount	(5,976)	(8,101)
Changes in other assets and liabilities, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net	5,243	(5,661)
Net cash provided by operating activities	100,247	66,570
Cash flows from investing activities:
Payments for Previous Acquisition	0	(23,377)
Net increase in loans	(800,812)	(197,514)
Sale of debt securities, available-for-sale	20,221	314,189
Paydown or maturity of debt securities, available-for-sale	234,267	95,386
Paydown or maturity of debt securities, held-to-maturity	25,833	4,760
Redemption of other investments	26,350	43,034
Sale of state tax credits held for sale	5,621	3,978
Sale of other real estate	652	4,380
Proceeds from Life Insurance Policy	1,993	0
Payments for the purchase of:
Available-for-sale debt securities	(274,677)	(467,695)
Other investments	(40,714)	(61,226)
State tax credits held for sale	(11,026)	(9,666)
Fixed assets, net	(1,633)	(4,008)
Net cash used in investing activities	(813,925)	(297,759)
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	602,192	25,653
Net increase (decrease) in interest-bearing deposit accounts	303,011	(70,446)
Proceeds from FHLB advances, net	27,700	384,500
Proceeds from Issuance of Long-term Debt	0	41,000
Repayments of Long-term Debt	(4,286)	(6,286)
Proceeds from Issuance of Subordinated Long-term Debt	61,953	0
Net decrease in other borrowings	(21,848)	(58,530)
Cash dividends paid on common stock	(14,176)	(12,055)
Payments for Repurchase of Common Stock	(15,347)	(11,817)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(562)	(880)
Net cash provided by financing activities	938,637	291,139
Net increase in cash and cash equivalents	224,959	59,950
Cash and cash equivalents, beginning of period	167,256	196,552
Cash and cash equivalents, end of period	392,215	256,502
Noncash transactions:
Cash paid during the period for interest	26,858	49,862
Income Taxes Paid, Net	7,514	12,955
Transfer to other real estate owned in settlement of loans	261	7,964
Sales of other real estate financed	48	0
Right-of-use assets obtained in exchange for lease obligations	$ 200	$ 0
Common shares issued related to acquisition	0	171,885
Transfer to Investments	$ 163,592	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The significant accounting policies used by Enterprise Financial Services Corp (the “Company,” “EFSC,” or “Enterprise”) in the preparation of the condensed consolidated financial statements are summarized below: Business and Consolidation Enterprise is a financial holding company that provides a full range of banking and wealth management services to individuals and corporate customers located in the Arizona, Kansas, Missouri, and New Mexico markets through its banking subsidiary, Enterprise Bank & Trust. Operating results for the three and nine months ended September 30, 2020 are not necessarily indicative of the results that may be expected for any other interim period or for the year ending December 31, 2020. For further information, refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC. Basis of Financial Statement Presentation The accompanying unaudited condensed consolidated financial statements of the Company and its subsidiaries have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Except as disclosed herein, there has been no material change in the information disclosed in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. The condensed consolidated financial statements include the accounts of the Company and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated. In the opinion of management, the consolidated financial statements contain all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the statements of financial position, results of operations, and cash flow for the interim periods. Recently Adopted Accounting Pronouncements On January 1, 2020, the Company adopted ASU 2016-13 “ Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which replaces the incurred loss methodology with an expected loss methodology commonly referred to as the CECL methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures such as loan commitments, standby letters of credit, financial guarantees, and other similar instruments. In addition, this standard made changes to the accounting for available-for-sale debt securities, including the requirement for credit losses to be presented as an allowance rather than as a write-down on available-for-sale debt securities. The Company adopted this standard using the modified retrospective method for all financial assets measured at amortized cost, and off-balance-sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under the new standard while prior period amounts continue to be reported in accordance with previously applicable GAAP. The Company recorded an after-tax decrease to retained earnings of $18.1 million as of January 1, 2020 for the cumulative effect of adopting this standard. The Company adopted this standard using the prospective transition approach for PCD assets that were previously classified as PCI assets. Management did not reassess whether PCI assets met the criteria of PCD assets as of the date of the adoption. The Company elected not to maintain PCI pools for certain loans which are now accounted for individually. Thus they are now included in nonperforming and classified loans. Management did not reassess whether modifications to individual acquired financial assets accounted for in pools were troubled debt restructurings as of the date of adoption. The following table illustrates the impact of adoption: ($ in thousands) December 31, 2019 Impact of Adoption January 1, 2020 Assets: Loans $ 5,314,337 $ 7,091 $ 5,321,428 Allowance for credit losses on loans 43,288 28,387 71,675 Allowance for credit losses on held-to-maturity debt securities — 303 303 Deferred tax asset 14,851 5,898 20,749 Liabilities: Reserve for unfunded commitments 430 2,413 2,843 Shareholders’ Equity Retained Earnings 380,737 (18,114) 362,623 The Company also adopted ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement” on January 1, 2020. The Company previously selected the option to adopt the removal or modification of disclosures during the second quarter of 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty are applied prospectively for only the most recent interim or annual period presented. All other amendments are applied retrospectively to all periods presented upon their effective date. The adoption of this update did not have a material effect on the Company's consolidated financial statements. Accounting Standards Issued but not yet Adopted FASB ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ” In March 2020, the FASB issued “Reference Rate Reform (Topic 848)” which provides optional expedients and exceptions for contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The guidance is effective for contract modifications as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the optional expedients and exceptions and has not yet determined the impact this standard may have on its consolidated financial statements. Loans The Company has elected to present the accrued interest receivable balance separate from amortized cost basis, to exclude accrued interest receivable balances from the tabular disclosures, and not to estimate an ACL on accrued interest receivable as these amounts are timely written off as a credit loss expense. Accrued interest receivable totaled $24.6 million at September 30, 2020 and was reported in Other Assets on the consolidated balance sheets. PCD Loans The Company has purchased loans, some of which have experienced more than insignificant credit deterioration since origination. PCD loans are recorded at the amount paid. An ACL is determined using the same methodology as other loans held for investment. The initial ACL determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and ACL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the ACL are recorded through provision expense. Allowance for Credit Losses on Loans The ACLL is a valuation account that is deducted from the amortized cost basis to present the net amount expected to be collected. Loans are charged-off against the allowance when management believes the uncollectibility of a loan balance is confirmed. Management estimates the allowance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, or term as well as for changes in environmental conditions, such as changes in unemployment rates, property values, or other relevant factors. The ACLL is measured on a collective basis when similar risk characteristics exist. The Company has identified the following portfolio segments: C&I – C&I loans consist of loans to small and medium-sized businesses in a wide variety of industries. These loans are generally collateralized by inventory, accounts receivable, equipment, real estate and other commercial assets, and may be supported by other credit enhancements such as personal guarantees. Risk arises primarily due to a difference between expected and actual cash flows of the borrower. However, the recoverability of these loans is also dependent on other factors primarily dictated by the type of collateral securing these loans. The fair value of the collateral securing these loans may fluctuate as market conditions change. Included within C&I are revolving loans supported by borrowing bases that fluctuate depending on the amount of underlying collateral. A portion of C&I loans consists of enterprise value lending, which are loans with senior debt exposure to private equity backed companies. CRE – CRE loans include various types of loans for which the Company holds real property as collateral. Commercial real estate lending activity is typically restricted to owner-occupied properties or to investor properties that are owned by customers with a current banking relationship. The primary risks of CRE loans include the borrower’s inability to pay, material decreases in the value of the real estate being held as collateral and significant increases in interest rates, which may make the real estate mortgage loan unprofitable. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. Construction and Land Development – The Company originates loans to finance construction projects including one- to four-family residences, multifamily residences, commercial office, and industrial projects. Construction loans are generally collateralized by first liens on the real estate and have floating interest rates. Construction loans are considered to have higher risks due to construction completion and timing risk, and the ultimate repayment being sensitive to interest rate changes, governmental regulation of real property and the availability of long-term financing. Additionally, economic conditions may impact the Company’s ability to recover its investment in construction loans. Adverse economic conditions may negatively impact the real estate market which could affect the borrowers’ ability to complete and sell the project. Additionally, the fair value of the underlying collateral may fluctuate as market conditions change. Residential Real Estate – The Company originates loans to finance one- to four-family residences, secured by both first and second liens. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Residential loans with a second lien are inherently riskier due to the junior lien position. Agricultural – Agricultural loans are generally secured with equipment, cattle, crops or other non-real property and at times the underlying real property. Agricultural loans are primarily included as a component of CRE and C&I loans. Consumer – The Company provides a broad range of consumer loans to customers, including personal lines of credit, credit cards and automobile loans. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Consumer loans are included as a component of Other loans. The Company utilizes a DCF method to measure the ACL on loans collectively evaluated that are sub-segmented by credit risk levels. The DCF method incorporates assumptions for probability of default, loss given default, prepayments and curtailments over the contractual term of the loans. In determining the probability of default, the Company utilized a regression analysis to determine certain economic factors that are relevant loss drivers in the portfolio segments based on historical or peer evaluations. National unemployment is a loss driver used in nearly all portfolios, except Consumer. The annual percentage change in gross domestic product is also used in C&I, Construction, Agricultural and Consumer portfolios. The annual percentage change in a commercial real estate index, national house price index and the consumer price index are used in the CRE, Residential Real Estate and Consumer portfolios, respectively. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by the Company. The Company uses a one-year reasonable and supportable forecast that considers baseline, upside and downside economic scenarios. For periods beyond the forecast period, the Company reverts to historical loss rates on a straight-line basis over a one-year period. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. When management determines that foreclosure is probable, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Mergers, Acquisitions and Dispositions Disclosures	ACQUISITIONS Acquisition of Seacoast Commerce Banc Holdings. On August 20, 2020, the Company and the Bank entered into a definitive agreement with Seacoast Commerce Banc Holdings (“SCBH”) and its wholly-owned bank subsidiary, Seacoast Commerce Bank (“Seacoast”), pursuant to which the Company will acquire SCBH and Seacoast. Based on the number of shares of Seacoast common stock and restricted stock awards outstanding as of the record date of September 24, 2020 and the closing price of Enterprise's common stock on Nasdaq of $27.27 on September 30, 2020, the implied value of the aggregate stock consideration would be approximately $135.3 million. Pursuant to the terms of the definitive agreement, upon consummation of the proposed transaction, SCBH shareholders will receive 0.5061 shares of the Company’s common stock for each share of SCBH common stock they hold. Headquartered in San Diego, California, Seacoast has five full-service banking branches in California and Nevada, and loan and deposit production offices throughout Arizona, California, Colorado, Illinois, Indiana, Massachusetts, Michigan, Nevada, Ohio, Oregon, Texas, Utah and Washington. The proposed transaction has been approved by the FDIC and the Federal Reserve Bank of St. Louis. The closing of the proposed transaction, which is anticipated to occur during the fourth quarter of 2020, remains subject to the approval of Seacoast’s shareholders and the Missouri Division of Finance, as well as the satisfaction or waiver, as applicable, of all closing conditions.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Basic earnings per common share data is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Common shares outstanding include common stock and restricted stock awards where recipients have satisfied the vesting terms. Diluted earnings per common share gives effect to all dilutive potential common shares outstanding during the period using the treasury stock method. The following table presents a summary of per common share data and amounts for the periods indicated. Three months ended September 30, Nine months ended September 30, (in thousands, except per share data) 2020 2019 2020 2019 Net income as reported $ 17,951 $ 29,069 $ 45,453 $ 63,649 Weighted average common shares outstanding 26,217 26,778 26,290 25,878 Additional dilutive common stock equivalents 11 90 21 98 Weighted average diluted common shares outstanding 26,228 26,868 26,311 25,976 Basic earnings per common share: $ 0.68 $ 1.09 $ 1.73 $ 2.46 Diluted earnings per common share: 0.68 1.08 $ 1.73 $ 2.45 For the three and nine months ended September 30, 2020 common stock equivalents of approximately 132,000 and 139,000

Investments

Investments	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investments	INVESTMENTS The following tables present the amortized cost, gross unrealized gains and losses, allowance of credit losses and fair value of securities available for sale and held to maturity: September 30, 2020 (in thousands) Amortized Cost Gross Gross Allowance for Credit Losses Fair Value Available-for-sale securities: Obligations of U.S. Government-sponsored enterprises $ 9,972 $ 228 $ — $ — $ 10,200 Obligations of states and political subdivisions 355,036 11,625 (539) — 366,122 Agency mortgage-backed securities 581,111 24,884 (46) — 605,949 U.S. Treasury bills 10,977 544 — — 11,521 Corporate debt securities 11,502 134 (2) — 11,634 Total securities available for sale $ 968,598 $ 37,415 $ (587) $ — $ 1,005,426 Held-to-maturity securities: Obligations of states and political subdivisions $ 95,497 $ 1,038 $ — $ (16) $ 96,519 Agency mortgage-backed securities 109,954 2,468 (148) — 112,274 Corporate debt securities 122,243 8,367 — (629) 129,981 Total securities held-to-maturity $ 327,694 $ 11,873 $ (148) $ (645) $ 338,774 Less: Allowance for credit losses 645 Total securities held-to-maturity, net $ 327,049 December 31, 2019 (in thousands) Amortized Cost Gross Gross Fair Value Available-for-sale securities: Obligations of U.S. Government-sponsored enterprises $ 9,954 $ 92 $ — $ 10,046 Obligations of states and political subdivisions 207,269 6,118 (363) 213,024 Agency mortgage-backed securities 888,129 15,083 (1,191) 902,021 U.S. Treasury Bills 9,971 255 — 10,226 Total securities available for sale $ 1,115,323 $ 21,548 $ (1,554) $ 1,135,317 Held-to-maturity securities: Obligations of states and political subdivisions $ 11,704 $ 170 $ — $ 11,874 Agency mortgage-backed securities 46,346 675 — 47,021 Corporate debt securities 123,116 128 (200) 123,044 Total securities held to maturity $ 181,166 $ 973 $ (200) $ 181,939 During the second quarter of 2020, the Company transferred municipal securities and agency mortgage-backed securities with an aggregate book value of $163.6 million and an aggregate fair value of $175.1 million from available-for-sale to held-to-maturity. The Company believes the held- to-maturity category is more consistent with the Company’s intent for these securities. The transfer of securities was made at fair value at the time of transfer. The unamortized portion of the $11.5 million unrealized holding gain at the time of transfer is retained in accumulated other comprehensive income and in the carrying value of held-to-maturity securities. Such amounts are amortized over the remaining life of the securities. During the third quarter of 2020, the Company sold seven agency mortgage-backed securities with an aggregate book value of $19.6 million for an aggregate gain of $0.4 million. At September 30, 2020 and December 31, 2019, there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than U.S. Government agencies and sponsored enterprises. The agency mortgage-backed securities are all issued by U.S. Government agencies and sponsored enterprises. Securities having a fair value of $449.5 million and $484.8 million at September 30, 2020 and December 31, 2019, respectively, were pledged as collateral to secure deposits of public institutions and for other purposes as required by law or contract provisions. The amortized cost and estimated fair value of debt securities at September 30, 2020, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 3 years. Available for sale Held to maturity (in thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 3,139 $ 3,161 $ — $ — Due after one year through five years 32,281 33,232 10,187 10,587 Due after five years through ten years 16,828 17,443 125,476 133,063 Due after ten years 335,239 345,641 82,077 82,850 Agency mortgage-backed securities 581,111 605,949 109,954 112,274 $ 968,598 $ 1,005,426 $ 327,694 $ 338,774 The following table presents a summary of available-for-sale investment securities in an unrealized loss position: September 30, 2020 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of states and political subdivisions $ 57,934 $ 539 $ — $ — $ 57,934 $ 539 Agency mortgage-backed securities 21,211 46 — — 21,211 46 Corporate debt securities 3,000 2 — — 3,000 2 $ 82,145 $ 587 $ — $ — $ 82,145 $ 587 The following table presents a summary of available-for-sale and held-to-maturity investment securities in an unrealized loss position: December 31, 2019 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of states and political subdivisions $ 56,327 $ 363 $ — $ — $ 56,327 $ 363 Agency mortgage-backed securities 131,693 756 41,491 435 173,184 1,191 Corporate debt securities 67,964 200 — — 67,964 200 $ 255,984 $ 1,319 $ 41,491 $ 435 $ 297,475 $ 1,754 The unrealized losses at both September 30, 2020 and December 31, 2019 were primarily attributable to changes in market interest rates after the securities were purchased. Management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include among other considerations (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it is more likely than not the Company would be required to sell the security before its anticipated recovery in market value. At September 30, 2020, management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired. Accrued interest receivable on available-for-sale debt securities totaled $4.0 million at September 30, 2020 and is excluded from the estimate of credit losses. Accrued interest receivable on held-to-maturity debt securities totaled $2.4 million at September 30, 2020 and is excluded from the estimate of expected credit losses. The estimate of expected credit losses considers historical credit loss information adjusted for current conditions and reasonable and supportable forecasts. At September 30, 2020, the ACL on held-to-maturity securities was $0.6 million.

Loans

Loans	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Portfolio Loans	LOANS The following table presents a summary of loans by category: (in thousands) September 30, 2020 December 31, 2019 Commercial and industrial $ 3,171,916 $ 2,361,157 Real estate: Commercial - investor owned 1,292,182 1,299,884 Commercial - owner occupied 735,704 697,437 Construction and land development 474,727 457,273 Residential 321,792 366,261 Total real estate loans 2,824,405 2,820,855 Other 151,230 134,941 Loans, before unearned loan fees 6,147,551 5,316,953 Unearned loan fees, net (21,244) (2,616) Loans, including unearned loan fees $ 6,126,307 $ 5,314,337 PPP loans totaled $838.6 million at September 30, 2020, or $819.1 million net of unearned fees of $19.5 million . The loan balance at September 30, 2020 also includes a discount on acquired loans of $19.8 million. At September 30, 2020 loans of $2.4 billion were pledged to FHLB and the Federal Reserve Bank. A summary of the activity in the ACLL by category for the three and nine months ended September 30, 2020 is as follows: (in thousands) Commercial and industrial CRE - investor owned CRE - Construction and land development Residential real estate Other Total Allowance for credit losses on loans: Balance at June 30, 2020 $ 50,139 $ 25,019 $ 11,088 $ 15,962 $ 6,333 $ 1,729 $ 110,270 Provision for credit losses 8,929 4,869 (1,854) 2,873 (1,132) 342 14,027 Charge-offs (2,006) (272) (30) — (173) (103) (2,584) Recoveries 808 55 268 83 303 40 1,557 Balance at September 30, 2020 $ 57,870 $ 29,671 $ 9,472 $ 18,918 $ 5,331 $ 2,008 $ 123,270 (in thousands) Commercial and industrial CRE - investor owned CRE - Construction and land development Residential real estate Other Total Allowance for credit losses on loans: Balance at December 31, 2019 $ 27,455 $ 5,935 $ 4,873 $ 2,611 $ 1,280 $ 1,134 $ 43,288 CECL adoption 6,494 10,726 2,598 5,183 3,470 (84) 28,387 PCD loans immediately charged off — (5) (57) (217) (1,401) — (1,680) Balance at January 1, 2020 $ 33,949 $ 16,656 $ 7,414 $ 7,577 $ 3,349 $ 1,050 $ 69,995 Provision for credit losses 27,688 10,692 1,740 11,220 1,623 1,150 54,113 Charge-offs (5,372) (498) (30) (31) (327) (294) (6,552) Recoveries 1,605 2,821 348 152 686 102 5,714 Balance at September 30, 2020 $ 57,870 $ 29,671 $ 9,472 $ 18,918 $ 5,331 $ 2,008 $ 123,270 Reserves on enterprise value lending and agricultural lending, which are included in the categories above, represented $20.1 million and $1.8 million, respectively, as of September 30, 2020. On January 1, 2020, the Company adopted the CECL methodology which added $28.4 million to the ACLL. Upon adoption, $1.7 million of nonaccrual PCD loans with individual outstanding balances of less than $100,000 were immediately charged-off. Under the CECL method, the Company recorded $14.0 million and $54.1 million in provision for credit losses on loans in the three and nine months ended September 30, 2020, respectively, compared to $1.8 million and $5.0 million in provision for loan losses in the prior year periods, respectively, under the incurred loss method. The increase in the provision for credit losses in 2020 was primarily due to a change in economic forecasts from the end of 2019 due to the COVID-19 pandemic. The deterioration in the forecast was most significant in the second quarter of 2020. The economic forecast improved in the third quarter of 2020 compared to the second quarter of 2020. The CECL methodology incorporates various economic scenarios. The Company utilizes three forecasts in the model, Moody’s baseline, a stronger near-term growth upside and a moderate recession downside forecast. The Company weights these scenarios at 80%, 10%, and 10%, respectively, which added approximately $1.2 million to the ACL over the baseline model. These forecasts incorporate an accommodative monetary policy and the current and anticipated impact of government stimulus. The Company has also recognized the risk posed by loans that have received multiple deferrals of principal and interest payments, including the hospitality sector, by allocating additional reserves to those segments. Some of the key risks to the forecasts that could result in future provision for credit losses are additional shutdowns and self-quarantines if another significant wave of COVID hits, small-business bankruptcies occur at higher levels, unemployment increases, or the next round of fiscal stimulus is delayed or does not occur. The following tables present the recorded investment in nonperforming loans by category: September 30, 2020 (in thousands) Nonaccrual Restructured, accruing Loans over 90 days past due and still accruing interest Total nonperforming loans Nonaccrual loans with no allowance Commercial and industrial $ 19,141 $ 3,557 $ 888 $ 23,586 $ 10,208 Real estate: Commercial - investor owned 9,850 — — 9,850 1,440 Commercial - owner occupied 1,511 — — 1,511 1,511 Construction and land development 200 — — 200 200 Residential 4,316 78 — 4,394 3,246 Other 19 — 63 82 — Total $ 35,037 $ 3,635 $ 951 $ 39,623 $ 16,605 No interest income was recognized on nonaccrual loans during the three or nine months ended September 30, 2020. December 31, 2019 (in thousands) Nonaccrual Restructured, accruing Loans over 90 days past due and still accruing interest Total nonperforming loans Commercial and industrial $ 22,328 $ — $ 250 $ 22,578 Real estate: Commercial - investor owned 2,303 — — 2,303 Commercial - owner occupied 213 — — 213 Residential 1,251 79 — 1,330 Other 1 — — 1 Total $ 26,096 $ 79 $ 250 $ 26,425 The following table presents the amortized cost basis of collateral-dependent nonperforming loans by class of loan at September 30, 2020: Type of Collateral (in thousands) Commercial Real Estate Residential Real Estate Blanket Lien Other Commercial and industrial $ 11,056 $ — $ 405 $ — Real estate: Commercial - investor owned 9,850 — — — Commercial - owner occupied 1,511 — — — Construction and land development — 200 — — Residential — 4,208 — — Other — — — 18 Total $ 22,417 $ 4,408 $ 405 $ 18 The recorded investment by category for troubled debt restructurings that occurred during the three months ended September 30, 2020 are as follows: September 30, 2020 (in thousands, except for number of loans) Number of loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 2 $ 3,716 $ 3,716 Real estate: Residential 1 217 217 Total 3 $ 3,933 $ 3,933 No troubled debt restructurings occurred during the three months ended September 30, 2019. The recorded investment by category for troubled debt restructurings that occurred during the nine months ended September 30, 2020 and 2019 are as follows: September 30, 2020 September 30, 2019 (in thousands, except for number of loans) Number of loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 3 $ 7,447 $ 7,447 — $ — $ — Real estate: Commercial - owner occupied — — — 1 188 188 Residential 3 372 372 2 332 332 Total 6 $ 7,819 $ 7,819 3 $ 520 $ 520 No troubled debt restructurings subsequently defaulted during the three or nine months ended September 30, 2020. Restructured loans that subsequently defaulted during the three months ended September 30, 2019 included one commercial and industrial loan with a recorded balance of $0.1 million. Restructured loans that subsequently defaulted for the nine months ended September 30, 2019 included two commercial and industrial loans with an aggregate recorded balance of $0.4 million In response to the COVID-19 pandemic, the Company has implemented short-term deferral programs allowing customers to primarily defer payments for up to 90 days. Deferrals under the CARES Act or interagency guidance are not included above as troubled debt restructurings. As of September 30, 2020, $690.8 million in loans have participated in the programs, including $355.8 million in loans deferring full principal and interest payments and $335.0 million in loans deferring principal only. As of September 30, 2020, $139.4 million loans remain in a deferral status. Interest of $4.5 million has been deferred and will be collected upon final maturity. The aging of the recorded investment in past due loans by class at September 30, 2020 is shown below. September 30, 2020 (in thousands) 30-89 Days 90 or More Total Current Total Commercial and industrial $ 1,558 $ 16,313 $ 17,871 $ 3,134,523 $ 3,152,394 Real estate: Commercial - investor owned 164 9,516 9,680 1,282,502 1,292,182 Commercial - owner occupied 1,166 1,190 2,356 733,348 735,704 Construction and land development 898 — 898 473,829 474,727 Residential 840 2,154 2,994 318,798 321,792 Other 46 82 128 149,380 149,508 Total $ 4,672 $ 29,255 $ 33,927 $ 6,092,380 $ 6,126,307 The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, such as current financial information, payment experience, credit documentation, and current economic factors among other factors. This analysis is performed on a quarterly basis. The Company uses the following definitions for risk ratings: • Grades 1, 2, and 3 – Includes loans to borrowers with a continuous record of strong earnings, sound balance sheet condition and capitalization, ample liquidity with solid cash flow, and whose management team has experience and depth within their industry. • Grade 4 – Includes loans to borrowers with positive trends in profitability, satisfactory capitalization and balance sheet condition, and sufficient liquidity and cash flow. • Grade 5 – Includes loans to borrowers that may display fluctuating trends in sales, profitability, capitalization, liquidity, and cash flow. • Grade 6 – Includes loans to borrowers where an adverse change or perceived weakness has occurred, but may be correctable in the near future. Alternatively, this rating category may also include circumstances where the borrower is starting to reverse a negative trend or condition, or has recently been upgraded from a 7, 8, or 9 rating. • Grade 7 – Watch credits are borrowers that have experienced financial setback of a nature that is not determined to be severe or influence ‘ongoing concern’ expectations. Although possible, no loss is anticipated at this time, due to strong collateral and/or guarantor support. • Grade 8 – Substandard credits include those borrowers characterized by significant losses and sustained downward trends in balance sheet condition, liquidity, and cash flow. Repayment reliance may have shifted to secondary sources. Collateral exposure may exist and additional reserves may be warranted. • Grade 9 – Doubtful credits include borrowers that may show deteriorating trends that are unlikely to be corrected. Collateral values may appear insufficient for full recovery, therefore requiring a partial charge-off, or debt renegotiation with the borrower. The borrower may have declared bankruptcy or bankruptcy is likely in the near term. All doubtful rated credits will be on nonaccrual. The recorded investment by risk category of the loans by class at September 30, 2020, which is based upon the most recent analysis performed is as follows: Term Loans by Origination Year (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Converted to Term Loans Revolving Loans Total Commercial and industrial Pass (1-6) $ 1,378,251 $ 499,865 $ 289,283 $ 155,369 $ 30,317 $ 41,477 $ 14,000 $ 524,025 $ 2,932,587 Watch (7) 41,834 11,685 3,421 11,619 22,835 105 — 63,198 154,697 Classified (8-9) 4,685 11,235 3,253 3,861 4,783 2,367 578 21,859 52,621 Total Commercial and industrial $ 1,424,770 $ 522,785 $ 295,957 $ 170,849 $ 57,935 $ 43,949 $ 14,578 $ 609,082 $ 3,139,905 Commercial real estate-investor owned Pass (1-6) $ 338,563 $ 277,705 $ 180,534 $ 119,492 $ 138,823 $ 158,678 $ 4,969 $ 33,539 $ 1,252,303 Watch (7) 6,634 5,115 1,245 — 12,584 3,609 — — 29,187 Classified (8-9) 64 498 8,362 455 248 1,065 — — 10,692 Total Commercial real estate-investor owned $ 345,261 $ 283,318 $ 190,141 $ 119,947 $ 151,655 $ 163,352 $ 4,969 $ 33,539 $ 1,292,182 Commercial real estate-owner occupied Pass (1-6) $ 192,320 $ 184,427 $ 80,269 $ 72,465 $ 43,855 $ 68,277 $ 2,715 $ 43,882 $ 688,210 Watch (7) 10,628 5,213 259 4,851 8,367 4,946 — 2,823 37,087 Classified (8-9) 400 508 4,538 812 — 4,149 — — 10,407 Total Commercial real estate-owner occupied $ 203,348 $ 190,148 $ 85,066 $ 78,128 $ 52,222 $ 77,372 $ 2,715 $ 46,705 $ 735,704 Construction real estate Pass (1-6) $ 147,206 $ 152,879 $ 77,811 $ 18,076 $ 11,676 $ 11,899 $ — $ 25,516 $ 445,063 Watch (7) 3,064 — 14,540 11,456 — 348 — — 29,408 Classified (8-9) 222 — — — — 34 — — 256 Total Construction real estate $ 150,492 $ 152,879 $ 92,351 $ 29,532 $ 11,676 $ 12,281 $ — $ 25,516 $ 474,727 Residential real estate Pass (1-6) $ 38,603 $ 30,290 $ 20,571 $ 17,630 $ 32,011 $ 105,538 $ 644 $ 64,662 $ 309,949 Watch (7) 212 852 828 — — 2,122 277 801 5,092 Classified (8-9) 534 882 328 13 906 3,111 — 50 5,824 Total residential real estate $ 39,349 $ 32,024 $ 21,727 $ 17,643 $ 32,917 $ 110,771 $ 921 $ 65,513 $ 320,865 Other Pass (1-6) $ 23,762 $ 13,492 $ 20,109 $ 551 $ 3,567 $ 28,539 $ — $ 52,276 $ 142,296 Watch (7) — 1 5 — — 2,685 — 1 2,692 Classified (8-9) — 19 21 3 — 18 9 6 76 Total Other $ 23,762 $ 13,512 $ 20,135 $ 554 $ 3,567 $ 31,242 $ 9 $ 52,283 $ 145,064 In the table above, loan originations in 2020 and 2019 with a classification of watch or classified primarily represent renewals or modifications initially underwritten and originated in prior years. For certain loans, primarily credit cards, the Company evaluates credit quality based on the aging status. The following table presents the recorded investment on loans based on payment activity: September 30, 2020 (in thousands) Performing Non Performing Total Commercial and industrial $ 12,425 $ 64 $ 12,489 Real estate: Residential 927 — 927 Other 4,381 63 4,444 Total $ 17,733 $ 127 $ 17,860 The recorded investment by risk category of loans by class at December 31, 2019, was as follows: December 31, 2019 (in thousands) Pass (1-6) Watch (7) Classified (8 & 9) Total* Commercial and industrial $ 2,151,084 $ 124,718 $ 70,021 $ 2,345,823 Real estate: Commercial - investor owned 1,242,569 17,572 2,840 1,262,981 Commercial - owner occupied 643,276 28,773 6,473 678,522 Construction and land development 437,134 12,140 106 449,380 Residential 348,246 4,450 2,496 355,192 Other 132,096 3 51 132,150 Total $ 4,954,405 $ 187,656 $ 81,987 $ 5,224,048 *Excludes $90.3 million of loans accounted for as PCI

Commitments

Commitments	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments	COMMITMENTS AND CONTINGENCIES The Company issues financial instruments with off balance sheet risk in the normal course of the business of meeting the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. These instruments may involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company’s extent of involvement and maximum potential exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of these instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for financial instruments included on its consolidated balance sheets. The contractual amounts of off-balance-sheet financial instruments are as follows: (in thousands) September 30, 2020 December 31, 2019 Commitments to extend credit $ 1,733,591 $ 1,469,413 Letters of credit 47,206 47,969 Off-Balance Sheet Credit Risk Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments usually have fixed expiration dates or other termination clauses, may have significant usage restrictions, and may require payment of a fee. Of the total commitments to extend credit at September 30, 2020, and December 31, 2019, approximately $170.0 million and $144.8 million, respectively, represent fixed rate loan commitments. Since certain of the commitments may expire without being drawn upon or may be revoked, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower. Collateral held varies, but may include accounts receivable, inventory, premises and equipment, and real estate. Other liabilities includes $5.2 million and $0.4 million for estimated losses attributable to the unadvanced commitments at September 30, 2020, and December 31, 2019, respectively. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance or payment of a customer to a third party. These standby letters of credit are issued to support contractual obligations of the Company’s customers. The credit risk involved in issuing letters of credit is essentially the same as the risk involved in extending loans to customers. As of September 30, 2020, the approximate remaining terms of standby letters of credit range from 1 month to 3 years, 5 months. Contingencies The Company and its subsidiaries are, from time to time, parties to various legal proceedings arising out of their businesses. Management believes there are no such proceedings pending or threatened against the Company or its subsidiaries which, if determined adversely, would have a material adverse effect on the business, consolidated financial condition, results of operations or cash flows of the Company or any of its subsidiaries.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS Risk Management Objective of Using Derivatives The Company is exposed to certain risk arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s borrowings. The Company does not enter into derivative financial instruments for trading purposes. Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. These derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. These cash flow hedges include: (1) swaps of variable three-month LIB OR on $62.0 million of junior subordinated debentures to a weighted-average-fixed rate of 2.62% over approximately six years, (2) a swap of the federal funds effective rate on $100.0 million of rolling FHLB overnight advances to a fixed rate of 1.12% for three years, and (3) a swap of three-month LIBOR on $100.0 million of rolling three-month FHLB advances for five years. For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive income and subsequently reclassified into interest expense in the same period(s) during which the hedged transaction affects earnings. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are paid on the Company’s variable-rate debt. During the next twelve months, the Company estimates that an additional $2.9 million will be reclassified as an increase to interest expense. Non-designated Hedges Derivatives not designated as hedges are not considered speculative and result from a service the Company provides to certain customers. The Company executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting derivatives the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings as a component of other noninterest income. The table below presents the fair value of the Company’s derivative financial instruments: Notional Amount Derivative Assets Derivative Liabilities (in thousands) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Derivatives Designated as Hedging Instruments: Interest rate swap $ 261,962 $ 61,962 $ — $ — $ 10,011 $ 2,872 Derivatives not Designated as Hedging Instruments: Interest rate swap $ 1,044,139 $ 749,819 $ 33,999 $ 11,055 $ 34,229 $ 11,875 Derivative assets are classified on the balance sheet in other assets. Derivative liabilities are classified on the balance sheet in other liabilities. The table below presents a gross presentation, the effects of offsetting, and a net presentation of the Company’s financial instruments that are subject to offsetting. The gross amounts of assets or liabilities can be reconciled to the tabular disclosure of fair value. The fair value table above provides the location that financial assets and liabilities are presented on the Balance Sheet. As of September 30, 2020 Gross Amounts Not Offset in the Statement of Financial Position (in thousands) Gross Amounts Recognized Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Fair Value Collateral Posted Net Amount Assets: Interest rate swap $ 33,999 $ — $ 33,999 $ 2 $ — $ 33,997 Liabilities: Interest rate swap $ 44,240 $ — $ 44,240 $ 2 $ 44,063 $ 175 Securities sold under agreements to repurchase 209,038 — 209,038 — 209,038 — As of December 31, 2019 Gross Amounts Not Offset in the Statement of Financial Position (in thousands) Gross Amounts Recognized Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Fair Value Collateral Posted Net Amount Assets: Interest rate swap $ 11,055 $ — $ 11,055 $ 56 $ — $ 10,999 Liabilities: Interest rate swap $ 14,747 $ — $ 14,747 $ 56 $ 14,573 $ 118 Securities sold under agreements to repurchase 230,886 — 230,886 — 230,886 — As of September 30, 2020, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $45.2 million. Further, the Company has minimum collateral posting thresholds with certain of its derivative counterparties and has posted collateral of $45.5 million

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The following table summarizes financial instruments measured at fair value on a recurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: September 30, 2020 (in thousands) Quoted Prices in Significant Significant Total Fair Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 10,200 $ — $ 10,200 Obligations of states and political subdivisions — 366,122 — 366,122 Agency mortgage-backed securities — 605,949 — 605,949 U.S. Treasury bills — 11,521 — 11,521 Corporate debt securities — 11,634 — 11,634 Total securities available for sale — 1,005,426 — 1,005,426 Derivatives — 33,999 — 33,999 Total assets $ — $ 1,039,425 $ — $ 1,039,425 Liabilities Derivatives $ — $ 44,240 $ — $ 44,240 Total liabilities $ — $ 44,240 $ — $ 44,240 December 31, 2019 (in thousands) Quoted Prices in Significant Significant Total Fair Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 10,046 $ — $ 10,046 Obligations of states and political subdivisions — 213,024 — 213,024 Residential mortgage-backed securities — 902,021 — 902,021 U.S. Treasury bills — 10,226 — 10,226 Total securities available-for-sale — 1,135,317 — 1,135,317 Derivative financial instruments — 11,055 — 11,055 Total assets $ — $ 1,146,372 $ — $ 1,146,372 Liabilities Derivatives $ — $ 14,747 $ — $ 14,747 Total liabilities $ — $ 14,747 $ — $ 14,747 From time to time, the Company measures certain assets at fair value on a nonrecurring basis. These include assets measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. (1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Significant Significant Total losses for the three Total losses for the nine months ended September 30, 2020 Impaired loans $ 1,639 $ — $ — $ 1,639 $ 1,788 $ 4,756 Other real estate 3,600 — — 3,600 248 1,000 Total $ 5,239 $ — $ — $ 5,239 $ 2,036 $ 5,756 (1) The amounts represent only balances measured at fair value during the period and still held as of the reporting date. Following is a summary of the carrying amounts and fair values of certain financial instruments: September 30, 2020 December 31, 2019 (in thousands) Carrying Amount Estimated fair value Level Carrying Amount Estimated fair value Level Balance sheet assets Securities held-to-maturity, net $ 327,049 $ 338,774 Level 2 $ 181,166 $ 181,939 Level 2 Other investments 43,456 43,456 Level 2 38,044 38,044 Level 2 Loans held for sale 14,032 14,032 Level 2 5,570 5,570 Level 2 Loans, net 6,003,037 5,961,862 Level 3 5,271,049 5,205,651 Level 3 State tax credits, held for sale 42,497 48,327 Level 3 36,802 39,046 Level 3 Balance sheet liabilities Certificates of deposit $ 612,045 $ 617,277 Level 3 $ 826,447 $ 825,203 Level 3 Subordinated debentures and notes 203,510 193,059 Level 2 141,258 130,985 Level 2 FHLB advances 250,000 251,942 Level 2 222,406 221,402 Level 2 Other borrowings and notes payable 239,038 239,038 Level 2 265,172 265,172 Level 2 For information regarding the methods and assumptions used to estimate the fair value of each class of financial instruments refer to Note 19 – Fair Value Measurements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC.

Subordinated Debentures

Subordinated Debentures	9 Months Ended
	Sep. 30, 2020
Subordinated Borrowings [Abstract]
Subordinated Debentures	NOTE 9 - SUBORDINATED DEBENTURES AND NOTES The following table presents the amounts and terms of each issuance of EFSC’s subordinated debentures and notes: Amount Maturity Date Initial Call Date (1) Interest Rate (in thousands) September 30, 2020 December 31, 2019 EFSC Clayco Statutory Trust I $ 3,196 $ 3,196 December 17, 2033 December 17, 2008 Floats 3MO LIBOR + 2.85% EFSC Capital Trust II 5,155 5,155 June 17, 2034 June 17, 2009 Floats 3MO LIBOR + 2.65% EFSC Statutory Trust III 11,341 11,341 December 15, 2034 December 15, 2009 Floats 3MO LIBOR + 1.97% EFSC Clayco Statutory Trust II 4,124 4,124 September 15, 2035 September 15, 2010 Floats 3MO LIBOR + 1.83% EFSC Statutory Trust IV 10,310 10,310 December 15, 2035 December 15, 2010 Floats 3MO LIBOR + 1.44% EFSC Statutory Trust V 4,124 4,124 September 15, 2036 September 15, 2011 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VI 14,433 14,433 March 30, 2037 March 30, 2012 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VII 4,124 4,124 December 15, 2037 December 15, 2012 Floats 3MO LIBOR + 2.25% JEFFCO Stat Trust I (2) 7,786 7,886 February 22, 2031 February 22, 2011 Fixed 10.20% JEFFCO Stat Trust II (2) 4,429 4,388 March 17, 2034 March 17, 2009 Floats 3MO LIBOR + 2.75% Trinity Capital Trust III (2) 5,256 5,206 September 8, 2034 September 8, 2009 Floats 3MO LIBOR + 2.70% Trinity Capital Trust IV (2) 10,310 10,302 November 23, 2035 August 23, 2010 Fixed 6.88% Trinity Capital Trust V (2) 7,665 7,543 December 15, 2036 September 15, 2011 Floats 3MO LIBOR + 1.65% Total junior subordinated debentures 92,253 92,132 5.75% Fixed-to-floating rate subordinated notes 63,250 — June 1, 2030 June 1, 2025 Fixed 5.75% until 4.75% Fixed-to-floating rate subordinated notes 50,000 50,000 November 1, 2026 November 1, 2021 Fixed 4.75% until Debt issuance costs (1,993) (874) Total fixed-to-floating rate subordinated notes 111,257 49,126 Total subordinated debentures and notes $ 203,510 $ 141,258 (1) Callable each quarter after initial call date. (2) Purchase accounting adjustments are reflected in the balance that also impact the effective interest rate. On May 21, 2020, EFSC issued $63.3 million of 5.75% fixed-to-floating rate subordinated notes due in 2030 in a public offering (the “2030 Notes”). From and including the date of issuance to, but excluding, June 1, 2025, the 2030 Notes will bear interest at a rate equal to 5.75% per annum, payable semiannually in arrears on each June 1 and December 1. From and including June 1, 2025 to, but excluding, the maturity date or the date of earlier redemption, the 2030 Notes will bear interest at a floating rate per annum equal to a benchmark rate (which is expected to be three-month term SOFR (as defined in the Indenture, dated May 21, 2020, between EFSC and U.S. Bank National Association, as trustee, and subsequent First Supplemental Indenture)), plus 566.0 basis points, payable quarterly in arrears on March 1, June 1, September 1 and December 1 of each year, commencing on September 1, 2025. Notwithstanding the foregoing, in the event that the benchmark rate is less than zero, then the benchmark rate shall be deemed to be zero.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Accumulated Other Comprehensive Income	ACCUMULATED OTHER COMPREHENSIVE INCOME The following tables present the changes in accumulated other comprehensive income after-tax by component: Three and nine months ended September 30, 2020 (in thousands) Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities Unamortized Gain (Loss) on Held-to-Maturity Securities Net Unrealized Loss on Cash Flow Hedges Total Balance, June 30, 2020 $ 27,872 $ 13,099 $ (8,162) $ 32,809 Net change $ (220) $ (705) $ 624 $ (301) Balance, September 30, 2020 $ 27,652 $ 12,394 $ (7,538) $ 32,508 Balance, December 31, 2019 $ 14,977 $ 4,934 $ (2,162) $ 17,749 Net change $ 21,325 $ (1,190) $ (5,376) $ 14,759 Transfer from available-for-sale to held-to-maturity (8,650) 8,650 — — Balance, September 30, 2020 $ 27,652 $ 12,394 $ (7,538) $ 32,508 Three and nine months ended September 30, 2019 (in thousands) Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities Unamortized Gain (Loss) on Held-to-Maturity Securities Net Unrealized Loss on Cash Flow Hedges Total Balance, June 30, 2019 $ 15,517 $ (230) $ (2,213) $ 13,074 Net change $ 6,764 $ 10 $ (637) $ 6,137 Balance, September 30, 2019 $ 22,281 $ (220) $ (2,850) $ 19,211 Balance, December 31, 2018 $ (9,047) $ (235) $ — $ (9,282) Net change $ 31,328 $ 15 $ (2,850) $ 28,493 Balance, September 30, 2019 $ 22,281 $ (220) $ (2,850) $ 19,211 The following tables present the pre-tax and after-tax changes in the components of other comprehensive income: Three months ended September 30, (in thousands) 2020 2019 Pre-tax Tax effect After-tax Pre-tax Tax effect After-tax Change in unrealized gain on available-for-sale debt securities $ 125 $ 31 $ 94 $ 9,320 $ 2,302 $ 7,018 Reclassification adjustment for realized gain on sale of available-for-sale debt securities (a) (417) (103) (314) (337) (83) (254) Reclassification of (gain) loss on held-to-maturity securities (b) (936) (231) (705) 13 3 10 Change in unrealized gain (loss) on cash flow hedges arising during the period 146 36 110 (888) (219) (669) Reclassification of loss on cash flow hedges (b) 683 169 514 42 10 32 Total other comprehensive income $ (399) $ (98) $ (301) $ 8,150 $ 2,013 $ 6,137 Nine months ended September 30, 2020 2019 Pre-tax Tax effect After-tax Pre-tax Tax effect After-tax Change in unrealized gain on available-for-sale debt securities $ 28,741 $ 7,099 $ 21,642 $ 41,649 $ 10,287 $ 31,362 Reclassification adjustment for realized gain on sale of available-for-sale debt securities (a) (421) (104) (317) (45) (11) (34) Reclassification of (gain) loss on held-to-maturity securities (b) (1,580) (390) (1,190) 20 5 15 Change in unrealized loss on cash flow hedges arising during the period (8,296) (2,049) (6,247) (3,833) (947) (2,886) Reclassification of loss on cash flow hedges (b) 1,157 286 871 47 11 36 Total other comprehensive income $ 19,601 $ 4,842 $ 14,759 $ 37,838 $ 9,345 $ 28,493 (a) The pre-tax amount is reported in noninterest income/expense in the Consolidated Statements of Operations (b) The pre-tax amount is reported in interest income/expense in the Consolidated Statements of Operations

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Business and Consolidation	Basis of Financial Statement Presentation The accompanying unaudited condensed consolidated financial statements of the Company and its subsidiaries have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Except as disclosed herein, there has been no material change in the information disclosed in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. The condensed consolidated financial statements include the accounts of the Company and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated. In the opinion of management, the consolidated financial statements contain all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of the statements of financial position, results of operations, and cash flow for the interim periods. Recently Adopted Accounting Pronouncements On January 1, 2020, the Company adopted ASU 2016-13 “ Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which replaces the incurred loss methodology with an expected loss methodology commonly referred to as the CECL methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures such as loan commitments, standby letters of credit, financial guarantees, and other similar instruments. In addition, this standard made changes to the accounting for available-for-sale debt securities, including the requirement for credit losses to be presented as an allowance rather than as a write-down on available-for-sale debt securities. The Company adopted this standard using the modified retrospective method for all financial assets measured at amortized cost, and off-balance-sheet credit exposures. Results for reporting periods beginning after January 1, 2020 are presented under the new standard while prior period amounts continue to be reported in accordance with previously applicable GAAP. The Company recorded an after-tax decrease to retained earnings of $18.1 million as of January 1, 2020 for the cumulative effect of adopting this standard. The Company adopted this standard using the prospective transition approach for PCD assets that were previously classified as PCI assets. Management did not reassess whether PCI assets met the criteria of PCD assets as of the date of the adoption. The Company elected not to maintain PCI pools for certain loans which are now accounted for individually. Thus they are now included in nonperforming and classified loans. Management did not reassess whether modifications to individual acquired financial assets accounted for in pools were troubled debt restructurings as of the date of adoption. The following table illustrates the impact of adoption: ($ in thousands) December 31, 2019 Impact of Adoption January 1, 2020 Assets: Loans $ 5,314,337 $ 7,091 $ 5,321,428 Allowance for credit losses on loans 43,288 28,387 71,675 Allowance for credit losses on held-to-maturity debt securities — 303 303 Deferred tax asset 14,851 5,898 20,749 Liabilities: Reserve for unfunded commitments 430 2,413 2,843 Shareholders’ Equity Retained Earnings 380,737 (18,114) 362,623 The Company also adopted ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement” on January 1, 2020. The Company previously selected the option to adopt the removal or modification of disclosures during the second quarter of 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty are applied prospectively for only the most recent interim or annual period presented. All other amendments are applied retrospectively to all periods presented upon their effective date. The adoption of this update did not have a material effect on the Company's consolidated financial statements. Accounting Standards Issued but not yet Adopted FASB ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ” In March 2020, the FASB issued “Reference Rate Reform (Topic 848)” which provides optional expedients and exceptions for contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The guidance is effective for contract modifications as of March 12, 2020 through December 31, 2022. The Company is currently evaluating the optional expedients and exceptions and has not yet determined the impact this standard may have on its consolidated financial statements. Loans The Company has elected to present the accrued interest receivable balance separate from amortized cost basis, to exclude accrued interest receivable balances from the tabular disclosures, and not to estimate an ACL on accrued interest receivable as these amounts are timely written off as a credit loss expense. Accrued interest receivable totaled $24.6 million at September 30, 2020 and was reported in Other Assets on the consolidated balance sheets. PCD Loans The Company has purchased loans, some of which have experienced more than insignificant credit deterioration since origination. PCD loans are recorded at the amount paid. An ACL is determined using the same methodology as other loans held for investment. The initial ACL determined on a collective basis is allocated to individual loans. The sum of the loan’s purchase price and ACL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the ACL are recorded through provision expense. Allowance for Credit Losses on Loans The ACLL is a valuation account that is deducted from the amortized cost basis to present the net amount expected to be collected. Loans are charged-off against the allowance when management believes the uncollectibility of a loan balance is confirmed. Management estimates the allowance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, or term as well as for changes in environmental conditions, such as changes in unemployment rates, property values, or other relevant factors. The ACLL is measured on a collective basis when similar risk characteristics exist. The Company has identified the following portfolio segments: C&I – C&I loans consist of loans to small and medium-sized businesses in a wide variety of industries. These loans are generally collateralized by inventory, accounts receivable, equipment, real estate and other commercial assets, and may be supported by other credit enhancements such as personal guarantees. Risk arises primarily due to a difference between expected and actual cash flows of the borrower. However, the recoverability of these loans is also dependent on other factors primarily dictated by the type of collateral securing these loans. The fair value of the collateral securing these loans may fluctuate as market conditions change. Included within C&I are revolving loans supported by borrowing bases that fluctuate depending on the amount of underlying collateral. A portion of C&I loans consists of enterprise value lending, which are loans with senior debt exposure to private equity backed companies. CRE – CRE loans include various types of loans for which the Company holds real property as collateral. Commercial real estate lending activity is typically restricted to owner-occupied properties or to investor properties that are owned by customers with a current banking relationship. The primary risks of CRE loans include the borrower’s inability to pay, material decreases in the value of the real estate being held as collateral and significant increases in interest rates, which may make the real estate mortgage loan unprofitable. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. Construction and Land Development – The Company originates loans to finance construction projects including one- to four-family residences, multifamily residences, commercial office, and industrial projects. Construction loans are generally collateralized by first liens on the real estate and have floating interest rates. Construction loans are considered to have higher risks due to construction completion and timing risk, and the ultimate repayment being sensitive to interest rate changes, governmental regulation of real property and the availability of long-term financing. Additionally, economic conditions may impact the Company’s ability to recover its investment in construction loans. Adverse economic conditions may negatively impact the real estate market which could affect the borrowers’ ability to complete and sell the project. Additionally, the fair value of the underlying collateral may fluctuate as market conditions change. Residential Real Estate – The Company originates loans to finance one- to four-family residences, secured by both first and second liens. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Residential loans with a second lien are inherently riskier due to the junior lien position. Agricultural – Agricultural loans are generally secured with equipment, cattle, crops or other non-real property and at times the underlying real property. Agricultural loans are primarily included as a component of CRE and C&I loans. Consumer – The Company provides a broad range of consumer loans to customers, including personal lines of credit, credit cards and automobile loans. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Consumer loans are included as a component of Other loans. The Company utilizes a DCF method to measure the ACL on loans collectively evaluated that are sub-segmented by credit risk levels. The DCF method incorporates assumptions for probability of default, loss given default, prepayments and curtailments over the contractual term of the loans. In determining the probability of default, the Company utilized a regression analysis to determine certain economic factors that are relevant loss drivers in the portfolio segments based on historical or peer evaluations. National unemployment is a loss driver used in nearly all portfolios, except Consumer. The annual percentage change in gross domestic product is also used in C&I, Construction, Agricultural and Consumer portfolios. The annual percentage change in a commercial real estate index, national house price index and the consumer price index are used in the CRE, Residential Real Estate and Consumer portfolios, respectively. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by the Company. The Company uses a one-year reasonable and supportable forecast that considers baseline, upside and downside economic scenarios. For periods beyond the forecast period, the Company reverts to historical loss rates on a straight-line basis over a one-year period. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. When management determines that foreclosure is probable, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate.
Available-for-sale Securities	Management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include among other considerations (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it is more likely than not the Company would be required to sell the security before its anticipated recovery in market value. At September 30, 2020, management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	The following table illustrates the impact of adoption: ($ in thousands) December 31, 2019 Impact of Adoption January 1, 2020 Assets: Loans $ 5,314,337 $ 7,091 $ 5,321,428 Allowance for credit losses on loans 43,288 28,387 71,675 Allowance for credit losses on held-to-maturity debt securities — 303 303 Deferred tax asset 14,851 5,898 20,749 Liabilities: Reserve for unfunded commitments 430 2,413 2,843 Shareholders’ Equity Retained Earnings 380,737 (18,114) 362,623

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Summary of Per Common Share Data and Amounts	The following table presents a summary of per common share data and amounts for the periods indicated. Three months ended September 30, Nine months ended September 30, (in thousands, except per share data) 2020 2019 2020 2019 Net income as reported $ 17,951 $ 29,069 $ 45,453 $ 63,649 Weighted average common shares outstanding 26,217 26,778 26,290 25,878 Additional dilutive common stock equivalents 11 90 21 98 Weighted average diluted common shares outstanding 26,228 26,868 26,311 25,976 Basic earnings per common share: $ 0.68 $ 1.09 $ 1.73 $ 2.46 Diluted earnings per common share: 0.68 1.08 $ 1.73 $ 2.45

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation	The following tables present the amortized cost, gross unrealized gains and losses, allowance of credit losses and fair value of securities available for sale and held to maturity: September 30, 2020 (in thousands) Amortized Cost Gross Gross Allowance for Credit Losses Fair Value Available-for-sale securities: Obligations of U.S. Government-sponsored enterprises $ 9,972 $ 228 $ — $ — $ 10,200 Obligations of states and political subdivisions 355,036 11,625 (539) — 366,122 Agency mortgage-backed securities 581,111 24,884 (46) — 605,949 U.S. Treasury bills 10,977 544 — — 11,521 Corporate debt securities 11,502 134 (2) — 11,634 Total securities available for sale $ 968,598 $ 37,415 $ (587) $ — $ 1,005,426 Held-to-maturity securities: Obligations of states and political subdivisions $ 95,497 $ 1,038 $ — $ (16) $ 96,519 Agency mortgage-backed securities 109,954 2,468 (148) — 112,274 Corporate debt securities 122,243 8,367 — (629) 129,981 Total securities held-to-maturity $ 327,694 $ 11,873 $ (148) $ (645) $ 338,774 Less: Allowance for credit losses 645 Total securities held-to-maturity, net $ 327,049 December 31, 2019 (in thousands) Amortized Cost Gross Gross Fair Value Available-for-sale securities: Obligations of U.S. Government-sponsored enterprises $ 9,954 $ 92 $ — $ 10,046 Obligations of states and political subdivisions 207,269 6,118 (363) 213,024 Agency mortgage-backed securities 888,129 15,083 (1,191) 902,021 U.S. Treasury Bills 9,971 255 — 10,226 Total securities available for sale $ 1,115,323 $ 21,548 $ (1,554) $ 1,135,317 Held-to-maturity securities: Obligations of states and political subdivisions $ 11,704 $ 170 $ — $ 11,874 Agency mortgage-backed securities 46,346 675 — 47,021 Corporate debt securities 123,116 128 (200) 123,044 Total securities held to maturity $ 181,166 $ 973 $ (200) $ 181,939
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation	The following tables present the amortized cost, gross unrealized gains and losses, allowance of credit losses and fair value of securities available for sale and held to maturity: September 30, 2020 (in thousands) Amortized Cost Gross Gross Allowance for Credit Losses Fair Value Available-for-sale securities: Obligations of U.S. Government-sponsored enterprises $ 9,972 $ 228 $ — $ — $ 10,200 Obligations of states and political subdivisions 355,036 11,625 (539) — 366,122 Agency mortgage-backed securities 581,111 24,884 (46) — 605,949 U.S. Treasury bills 10,977 544 — — 11,521 Corporate debt securities 11,502 134 (2) — 11,634 Total securities available for sale $ 968,598 $ 37,415 $ (587) $ — $ 1,005,426 Held-to-maturity securities: Obligations of states and political subdivisions $ 95,497 $ 1,038 $ — $ (16) $ 96,519 Agency mortgage-backed securities 109,954 2,468 (148) — 112,274 Corporate debt securities 122,243 8,367 — (629) 129,981 Total securities held-to-maturity $ 327,694 $ 11,873 $ (148) $ (645) $ 338,774 Less: Allowance for credit losses 645 Total securities held-to-maturity, net $ 327,049 December 31, 2019 (in thousands) Amortized Cost Gross Gross Fair Value Available-for-sale securities: Obligations of U.S. Government-sponsored enterprises $ 9,954 $ 92 $ — $ 10,046 Obligations of states and political subdivisions 207,269 6,118 (363) 213,024 Agency mortgage-backed securities 888,129 15,083 (1,191) 902,021 U.S. Treasury Bills 9,971 255 — 10,226 Total securities available for sale $ 1,115,323 $ 21,548 $ (1,554) $ 1,135,317 Held-to-maturity securities: Obligations of states and political subdivisions $ 11,704 $ 170 $ — $ 11,874 Agency mortgage-backed securities 46,346 675 — 47,021 Corporate debt securities 123,116 128 (200) 123,044 Total securities held to maturity $ 181,166 $ 973 $ (200) $ 181,939
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of debt securities at September 30, 2020, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 3 years. Available for sale Held to maturity (in thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 3,139 $ 3,161 $ — $ — Due after one year through five years 32,281 33,232 10,187 10,587 Due after five years through ten years 16,828 17,443 125,476 133,063 Due after ten years 335,239 345,641 82,077 82,850 Agency mortgage-backed securities 581,111 605,949 109,954 112,274 $ 968,598 $ 1,005,426 $ 327,694 $ 338,774
Schedule of Unrealized Loss on Investments	The following table presents a summary of available-for-sale investment securities in an unrealized loss position: September 30, 2020 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of states and political subdivisions $ 57,934 $ 539 $ — $ — $ 57,934 $ 539 Agency mortgage-backed securities 21,211 46 — — 21,211 46 Corporate debt securities 3,000 2 — — 3,000 2 $ 82,145 $ 587 $ — $ — $ 82,145 $ 587 The following table presents a summary of available-for-sale and held-to-maturity investment securities in an unrealized loss position: December 31, 2019 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of states and political subdivisions $ 56,327 $ 363 $ — $ — $ 56,327 $ 363 Agency mortgage-backed securities 131,693 756 41,491 435 173,184 1,191 Corporate debt securities 67,964 200 — — 67,964 200 $ 255,984 $ 1,319 $ 41,491 $ 435 $ 297,475 $ 1,754

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2020
Non-covered Loans [Line Items]
Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category	The recorded investment by risk category of the loans by class at September 30, 2020, which is based upon the most recent analysis performed is as follows: Term Loans by Origination Year (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Converted to Term Loans Revolving Loans Total Commercial and industrial Pass (1-6) $ 1,378,251 $ 499,865 $ 289,283 $ 155,369 $ 30,317 $ 41,477 $ 14,000 $ 524,025 $ 2,932,587 Watch (7) 41,834 11,685 3,421 11,619 22,835 105 — 63,198 154,697 Classified (8-9) 4,685 11,235 3,253 3,861 4,783 2,367 578 21,859 52,621 Total Commercial and industrial $ 1,424,770 $ 522,785 $ 295,957 $ 170,849 $ 57,935 $ 43,949 $ 14,578 $ 609,082 $ 3,139,905 Commercial real estate-investor owned Pass (1-6) $ 338,563 $ 277,705 $ 180,534 $ 119,492 $ 138,823 $ 158,678 $ 4,969 $ 33,539 $ 1,252,303 Watch (7) 6,634 5,115 1,245 — 12,584 3,609 — — 29,187 Classified (8-9) 64 498 8,362 455 248 1,065 — — 10,692 Total Commercial real estate-investor owned $ 345,261 $ 283,318 $ 190,141 $ 119,947 $ 151,655 $ 163,352 $ 4,969 $ 33,539 $ 1,292,182 Commercial real estate-owner occupied Pass (1-6) $ 192,320 $ 184,427 $ 80,269 $ 72,465 $ 43,855 $ 68,277 $ 2,715 $ 43,882 $ 688,210 Watch (7) 10,628 5,213 259 4,851 8,367 4,946 — 2,823 37,087 Classified (8-9) 400 508 4,538 812 — 4,149 — — 10,407 Total Commercial real estate-owner occupied $ 203,348 $ 190,148 $ 85,066 $ 78,128 $ 52,222 $ 77,372 $ 2,715 $ 46,705 $ 735,704 Construction real estate Pass (1-6) $ 147,206 $ 152,879 $ 77,811 $ 18,076 $ 11,676 $ 11,899 $ — $ 25,516 $ 445,063 Watch (7) 3,064 — 14,540 11,456 — 348 — — 29,408 Classified (8-9) 222 — — — — 34 — — 256 Total Construction real estate $ 150,492 $ 152,879 $ 92,351 $ 29,532 $ 11,676 $ 12,281 $ — $ 25,516 $ 474,727 Residential real estate Pass (1-6) $ 38,603 $ 30,290 $ 20,571 $ 17,630 $ 32,011 $ 105,538 $ 644 $ 64,662 $ 309,949 Watch (7) 212 852 828 — — 2,122 277 801 5,092 Classified (8-9) 534 882 328 13 906 3,111 — 50 5,824 Total residential real estate $ 39,349 $ 32,024 $ 21,727 $ 17,643 $ 32,917 $ 110,771 $ 921 $ 65,513 $ 320,865 Other Pass (1-6) $ 23,762 $ 13,492 $ 20,109 $ 551 $ 3,567 $ 28,539 $ — $ 52,276 $ 142,296 Watch (7) — 1 5 — — 2,685 — 1 2,692 Classified (8-9) — 19 21 3 — 18 9 6 76 Total Other $ 23,762 $ 13,512 $ 20,135 $ 554 $ 3,567 $ 31,242 $ 9 $ 52,283 $ 145,064 The following table presents the recorded investment on loans based on payment activity: September 30, 2020 (in thousands) Performing Non Performing Total Commercial and industrial $ 12,425 $ 64 $ 12,489 Real estate: Residential 927 — 927 Other 4,381 63 4,444 Total $ 17,733 $ 127 $ 17,860
Portfolio loans, net
Non-covered Loans [Line Items]
Summary of Portfolio Loans by Category	The following table presents a summary of loans by category: (in thousands) September 30, 2020 December 31, 2019 Commercial and industrial $ 3,171,916 $ 2,361,157 Real estate: Commercial - investor owned 1,292,182 1,299,884 Commercial - owner occupied 735,704 697,437 Construction and land development 474,727 457,273 Residential 321,792 366,261 Total real estate loans 2,824,405 2,820,855 Other 151,230 134,941 Loans, before unearned loan fees 6,147,551 5,316,953 Unearned loan fees, net (21,244) (2,616) Loans, including unearned loan fees $ 6,126,307 $ 5,314,337
Summary of Allowance for Loan Losses and the Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method	A summary of the activity in the ACLL by category for the three and nine months ended September 30, 2020 is as follows: (in thousands) Commercial and industrial CRE - investor owned CRE - Construction and land development Residential real estate Other Total Allowance for credit losses on loans: Balance at June 30, 2020 $ 50,139 $ 25,019 $ 11,088 $ 15,962 $ 6,333 $ 1,729 $ 110,270 Provision for credit losses 8,929 4,869 (1,854) 2,873 (1,132) 342 14,027 Charge-offs (2,006) (272) (30) — (173) (103) (2,584) Recoveries 808 55 268 83 303 40 1,557 Balance at September 30, 2020 $ 57,870 $ 29,671 $ 9,472 $ 18,918 $ 5,331 $ 2,008 $ 123,270 (in thousands) Commercial and industrial CRE - investor owned CRE - Construction and land development Residential real estate Other Total Allowance for credit losses on loans: Balance at December 31, 2019 $ 27,455 $ 5,935 $ 4,873 $ 2,611 $ 1,280 $ 1,134 $ 43,288 CECL adoption 6,494 10,726 2,598 5,183 3,470 (84) 28,387 PCD loans immediately charged off — (5) (57) (217) (1,401) — (1,680) Balance at January 1, 2020 $ 33,949 $ 16,656 $ 7,414 $ 7,577 $ 3,349 $ 1,050 $ 69,995 Provision for credit losses 27,688 10,692 1,740 11,220 1,623 1,150 54,113 Charge-offs (5,372) (498) (30) (31) (327) (294) (6,552) Recoveries 1,605 2,821 348 152 686 102 5,714 Balance at September 30, 2020 $ 57,870 $ 29,671 $ 9,472 $ 18,918 $ 5,331 $ 2,008 $ 123,270 Reserves on enterprise value lending and agricultural lending, which are included in the categories above, represented $20.1 million and $1.8 million, respectively, as of September 30, 2020.
Financing Receivable, Noncurrent, Allowance for Credit Loss	A summary of the activity in the ACLL by category for the three and nine months ended September 30, 2020 is as follows: (in thousands) Commercial and industrial CRE - investor owned CRE - Construction and land development Residential real estate Other Total Allowance for credit losses on loans: Balance at June 30, 2020 $ 50,139 $ 25,019 $ 11,088 $ 15,962 $ 6,333 $ 1,729 $ 110,270 Provision for credit losses 8,929 4,869 (1,854) 2,873 (1,132) 342 14,027 Charge-offs (2,006) (272) (30) — (173) (103) (2,584) Recoveries 808 55 268 83 303 40 1,557 Balance at September 30, 2020 $ 57,870 $ 29,671 $ 9,472 $ 18,918 $ 5,331 $ 2,008 $ 123,270 (in thousands) Commercial and industrial CRE - investor owned CRE - Construction and land development Residential real estate Other Total Allowance for credit losses on loans: Balance at December 31, 2019 $ 27,455 $ 5,935 $ 4,873 $ 2,611 $ 1,280 $ 1,134 $ 43,288 CECL adoption 6,494 10,726 2,598 5,183 3,470 (84) 28,387 PCD loans immediately charged off — (5) (57) (217) (1,401) — (1,680) Balance at January 1, 2020 $ 33,949 $ 16,656 $ 7,414 $ 7,577 $ 3,349 $ 1,050 $ 69,995 Provision for credit losses 27,688 10,692 1,740 11,220 1,623 1,150 54,113 Charge-offs (5,372) (498) (30) (31) (327) (294) (6,552) Recoveries 1,605 2,821 348 152 686 102 5,714 Balance at September 30, 2020 $ 57,870 $ 29,671 $ 9,472 $ 18,918 $ 5,331 $ 2,008 $ 123,270 Reserves on enterprise value lending and agricultural lending, which are included in the categories above, represented $20.1 million and $1.8 million, respectively, as of September 30, 2020.
Summary of Portfolio Loans Individually Evaluated for Impairment and Recorded Investment in Impaired Non-Covered Loans by Category	The following tables present the recorded investment in nonperforming loans by category: September 30, 2020 (in thousands) Nonaccrual Restructured, accruing Loans over 90 days past due and still accruing interest Total nonperforming loans Nonaccrual loans with no allowance Commercial and industrial $ 19,141 $ 3,557 $ 888 $ 23,586 $ 10,208 Real estate: Commercial - investor owned 9,850 — — 9,850 1,440 Commercial - owner occupied 1,511 — — 1,511 1,511 Construction and land development 200 — — 200 200 Residential 4,316 78 — 4,394 3,246 Other 19 — 63 82 — Total $ 35,037 $ 3,635 $ 951 $ 39,623 $ 16,605 No interest income was recognized on nonaccrual loans during the three or nine months ended September 30, 2020. December 31, 2019 (in thousands) Nonaccrual Restructured, accruing Loans over 90 days past due and still accruing interest Total nonperforming loans Commercial and industrial $ 22,328 $ — $ 250 $ 22,578 Real estate: Commercial - investor owned 2,303 — — 2,303 Commercial - owner occupied 213 — — 213 Residential 1,251 79 — 1,330 Other 1 — — 1 Total $ 26,096 $ 79 $ 250 $ 26,425 The following table presents the amortized cost basis of collateral-dependent nonperforming loans by class of loan at September 30, 2020: Type of Collateral (in thousands) Commercial Real Estate Residential Real Estate Blanket Lien Other Commercial and industrial $ 11,056 $ — $ 405 $ — Real estate: Commercial - investor owned 9,850 — — — Commercial - owner occupied 1,511 — — — Construction and land development — 200 — — Residential — 4,208 — — Other — — — 18 Total $ 22,417 $ 4,408 $ 405 $ 18
Summary of Recorded Investment by Category for Portfolio Loans Restructured	The following table presents the amortized cost basis of collateral-dependent nonperforming loans by class of loan at September 30, 2020: Type of Collateral (in thousands) Commercial Real Estate Residential Real Estate Blanket Lien Other Commercial and industrial $ 11,056 $ — $ 405 $ — Real estate: Commercial - investor owned 9,850 — — — Commercial - owner occupied 1,511 — — — Construction and land development — 200 — — Residential — 4,208 — — Other — — — 18 Total $ 22,417 $ 4,408 $ 405 $ 18 The recorded investment by category for troubled debt restructurings that occurred during the three months ended September 30, 2020 are as follows: September 30, 2020 (in thousands, except for number of loans) Number of loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 2 $ 3,716 $ 3,716 Real estate: Residential 1 217 217 Total 3 $ 3,933 $ 3,933 No troubled debt restructurings occurred during the three months ended September 30, 2019. The recorded investment by category for troubled debt restructurings that occurred during the nine months ended September 30, 2020 and 2019 are as follows: September 30, 2020 September 30, 2019 (in thousands, except for number of loans) Number of loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 3 $ 7,447 $ 7,447 — $ — $ — Real estate: Commercial - owner occupied — — — 1 188 188 Residential 3 372 372 2 332 332 Total 6 $ 7,819 $ 7,819 3 $ 520 $ 520
Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted	No troubled debt restructurings subsequently defaulted during the three or nine months ended September 30, 2020. Restructured loans that subsequently defaulted during the three months ended September 30, 2019 included one commercial and industrial loan with a recorded balance of $0.1 million. Restructured loans that subsequently defaulted for the nine months ended September 30, 2019 included two commercial and industrial loans with an aggregate recorded balance of $0.4 million
Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category	The aging of the recorded investment in past due loans by class at September 30, 2020 is shown below. September 30, 2020 (in thousands) 30-89 Days 90 or More Total Current Total Commercial and industrial $ 1,558 $ 16,313 $ 17,871 $ 3,134,523 $ 3,152,394 Real estate: Commercial - investor owned 164 9,516 9,680 1,282,502 1,292,182 Commercial - owner occupied 1,166 1,190 2,356 733,348 735,704 Construction and land development 898 — 898 473,829 474,727 Residential 840 2,154 2,994 318,798 321,792 Other 46 82 128 149,380 149,508 Total $ 4,672 $ 29,255 $ 33,927 $ 6,092,380 $ 6,126,307
Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category	The recorded investment by risk category of the loans by class at September 30, 2020, which is based upon the most recent analysis performed is as follows: Term Loans by Origination Year (in thousands) 2020 2019 2018 2017 2016 Prior Revolving Loans Converted to Term Loans Revolving Loans Total Commercial and industrial Pass (1-6) $ 1,378,251 $ 499,865 $ 289,283 $ 155,369 $ 30,317 $ 41,477 $ 14,000 $ 524,025 $ 2,932,587 Watch (7) 41,834 11,685 3,421 11,619 22,835 105 — 63,198 154,697 Classified (8-9) 4,685 11,235 3,253 3,861 4,783 2,367 578 21,859 52,621 Total Commercial and industrial $ 1,424,770 $ 522,785 $ 295,957 $ 170,849 $ 57,935 $ 43,949 $ 14,578 $ 609,082 $ 3,139,905 Commercial real estate-investor owned Pass (1-6) $ 338,563 $ 277,705 $ 180,534 $ 119,492 $ 138,823 $ 158,678 $ 4,969 $ 33,539 $ 1,252,303 Watch (7) 6,634 5,115 1,245 — 12,584 3,609 — — 29,187 Classified (8-9) 64 498 8,362 455 248 1,065 — — 10,692 Total Commercial real estate-investor owned $ 345,261 $ 283,318 $ 190,141 $ 119,947 $ 151,655 $ 163,352 $ 4,969 $ 33,539 $ 1,292,182 Commercial real estate-owner occupied Pass (1-6) $ 192,320 $ 184,427 $ 80,269 $ 72,465 $ 43,855 $ 68,277 $ 2,715 $ 43,882 $ 688,210 Watch (7) 10,628 5,213 259 4,851 8,367 4,946 — 2,823 37,087 Classified (8-9) 400 508 4,538 812 — 4,149 — — 10,407 Total Commercial real estate-owner occupied $ 203,348 $ 190,148 $ 85,066 $ 78,128 $ 52,222 $ 77,372 $ 2,715 $ 46,705 $ 735,704 Construction real estate Pass (1-6) $ 147,206 $ 152,879 $ 77,811 $ 18,076 $ 11,676 $ 11,899 $ — $ 25,516 $ 445,063 Watch (7) 3,064 — 14,540 11,456 — 348 — — 29,408 Classified (8-9) 222 — — — — 34 — — 256 Total Construction real estate $ 150,492 $ 152,879 $ 92,351 $ 29,532 $ 11,676 $ 12,281 $ — $ 25,516 $ 474,727 Residential real estate Pass (1-6) $ 38,603 $ 30,290 $ 20,571 $ 17,630 $ 32,011 $ 105,538 $ 644 $ 64,662 $ 309,949 Watch (7) 212 852 828 — — 2,122 277 801 5,092 Classified (8-9) 534 882 328 13 906 3,111 — 50 5,824 Total residential real estate $ 39,349 $ 32,024 $ 21,727 $ 17,643 $ 32,917 $ 110,771 $ 921 $ 65,513 $ 320,865 Other Pass (1-6) $ 23,762 $ 13,492 $ 20,109 $ 551 $ 3,567 $ 28,539 $ — $ 52,276 $ 142,296 Watch (7) — 1 5 — — 2,685 — 1 2,692 Classified (8-9) — 19 21 3 — 18 9 6 76 Total Other $ 23,762 $ 13,512 $ 20,135 $ 554 $ 3,567 $ 31,242 $ 9 $ 52,283 $ 145,064 In the table above, loan originations in 2020 and 2019 with a classification of watch or classified primarily represent renewals or modifications initially underwritten and originated in prior years. For certain loans, primarily credit cards, the Company evaluates credit quality based on the aging status. The following table presents the recorded investment on loans based on payment activity: September 30, 2020 (in thousands) Performing Non Performing Total Commercial and industrial $ 12,425 $ 64 $ 12,489 Real estate: Residential 927 — 927 Other 4,381 63 4,444 Total $ 17,733 $ 127 $ 17,860 The recorded investment by risk category of loans by class at December 31, 2019, was as follows: December 31, 2019 (in thousands) Pass (1-6) Watch (7) Classified (8 & 9) Total* Commercial and industrial $ 2,151,084 $ 124,718 $ 70,021 $ 2,345,823 Real estate: Commercial - investor owned 1,242,569 17,572 2,840 1,262,981 Commercial - owner occupied 643,276 28,773 6,473 678,522 Construction and land development 437,134 12,140 106 449,380 Residential 348,246 4,450 2,496 355,192 Other 132,096 3 51 132,150 Total $ 4,954,405 $ 187,656 $ 81,987 $ 5,224,048 *Excludes $90.3 million of loans accounted for as PCI

Commitments (Tables)

Commitments (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments	The contractual amounts of off-balance-sheet financial instruments are as follows: (in thousands) September 30, 2020 December 31, 2019 Commitments to extend credit $ 1,733,591 $ 1,469,413 Letters of credit 47,206 47,969

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Notional Amount Derivative Assets Derivative Liabilities (in thousands) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Derivatives Designated as Hedging Instruments: Interest rate swap $ 261,962 $ 61,962 $ — $ — $ 10,011 $ 2,872 Derivatives not Designated as Hedging Instruments: Interest rate swap $ 1,044,139 $ 749,819 $ 33,999 $ 11,055 $ 34,229 $ 11,875 Derivative assets are classified on the balance sheet in other assets. Derivative liabilities are classified on the balance sheet in other liabilities. The table below presents a gross presentation, the effects of offsetting, and a net presentation of the Company’s financial instruments that are subject to offsetting. The gross amounts of assets or liabilities can be reconciled to the tabular disclosure of fair value. The fair value table above provides the location that financial assets and liabilities are presented on the Balance Sheet. As of September 30, 2020 Gross Amounts Not Offset in the Statement of Financial Position (in thousands) Gross Amounts Recognized Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Fair Value Collateral Posted Net Amount Assets: Interest rate swap $ 33,999 $ — $ 33,999 $ 2 $ — $ 33,997 Liabilities: Interest rate swap $ 44,240 $ — $ 44,240 $ 2 $ 44,063 $ 175 Securities sold under agreements to repurchase 209,038 — 209,038 — 209,038 — As of December 31, 2019 Gross Amounts Not Offset in the Statement of Financial Position (in thousands) Gross Amounts Recognized Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Fair Value Collateral Posted Net Amount Assets: Interest rate swap $ 11,055 $ — $ 11,055 $ 56 $ — $ 10,999 Liabilities: Interest rate swap $ 14,747 $ — $ 14,747 $ 56 $ 14,573 $ 118 Securities sold under agreements to repurchase 230,886 — 230,886 — 230,886 —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Summary of Financial Instruments Measured at Fair Value on a Recurring Basis	The following table summarizes financial instruments measured at fair value on a recurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: September 30, 2020 (in thousands) Quoted Prices in Significant Significant Total Fair Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 10,200 $ — $ 10,200 Obligations of states and political subdivisions — 366,122 — 366,122 Agency mortgage-backed securities — 605,949 — 605,949 U.S. Treasury bills — 11,521 — 11,521 Corporate debt securities — 11,634 — 11,634 Total securities available for sale — 1,005,426 — 1,005,426 Derivatives — 33,999 — 33,999 Total assets $ — $ 1,039,425 $ — $ 1,039,425 Liabilities Derivatives $ — $ 44,240 $ — $ 44,240 Total liabilities $ — $ 44,240 $ — $ 44,240 December 31, 2019 (in thousands) Quoted Prices in Significant Significant Total Fair Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 10,046 $ — $ 10,046 Obligations of states and political subdivisions — 213,024 — 213,024 Residential mortgage-backed securities — 902,021 — 902,021 U.S. Treasury bills — 10,226 — 10,226 Total securities available-for-sale — 1,135,317 — 1,135,317 Derivative financial instruments — 11,055 — 11,055 Total assets $ — $ 1,146,372 $ — $ 1,146,372 Liabilities Derivatives $ — $ 14,747 $ — $ 14,747 Total liabilities $ — $ 14,747 $ — $ 14,747
Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis	(1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Significant Significant Total losses for the three Total losses for the nine months ended September 30, 2020 Impaired loans $ 1,639 $ — $ — $ 1,639 $ 1,788 $ 4,756 Other real estate 3,600 — — 3,600 248 1,000 Total $ 5,239 $ — $ — $ 5,239 $ 2,036 $ 5,756 (1) The amounts represent only balances measured at fair value during the period and still held as of the reporting date.
Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets	Following is a summary of the carrying amounts and fair values of certain financial instruments: September 30, 2020 December 31, 2019 (in thousands) Carrying Amount Estimated fair value Level Carrying Amount Estimated fair value Level Balance sheet assets Securities held-to-maturity, net $ 327,049 $ 338,774 Level 2 $ 181,166 $ 181,939 Level 2 Other investments 43,456 43,456 Level 2 38,044 38,044 Level 2 Loans held for sale 14,032 14,032 Level 2 5,570 5,570 Level 2 Loans, net 6,003,037 5,961,862 Level 3 5,271,049 5,205,651 Level 3 State tax credits, held for sale 42,497 48,327 Level 3 36,802 39,046 Level 3 Balance sheet liabilities Certificates of deposit $ 612,045 $ 617,277 Level 3 $ 826,447 $ 825,203 Level 3 Subordinated debentures and notes 203,510 193,059 Level 2 141,258 130,985 Level 2 FHLB advances 250,000 251,942 Level 2 222,406 221,402 Level 2 Other borrowings and notes payable 239,038 239,038 Level 2 265,172 265,172 Level 2

Subordinated Debentures (Tables

Subordinated Debentures (Tables)	9 Months Ended
	Sep. 30, 2020
Subordinated Borrowings [Abstract]
Schedule of Subordinated Debentures	The following table presents the amounts and terms of each issuance of EFSC’s subordinated debentures and notes: Amount Maturity Date Initial Call Date (1) Interest Rate (in thousands) September 30, 2020 December 31, 2019 EFSC Clayco Statutory Trust I $ 3,196 $ 3,196 December 17, 2033 December 17, 2008 Floats 3MO LIBOR + 2.85% EFSC Capital Trust II 5,155 5,155 June 17, 2034 June 17, 2009 Floats 3MO LIBOR + 2.65% EFSC Statutory Trust III 11,341 11,341 December 15, 2034 December 15, 2009 Floats 3MO LIBOR + 1.97% EFSC Clayco Statutory Trust II 4,124 4,124 September 15, 2035 September 15, 2010 Floats 3MO LIBOR + 1.83% EFSC Statutory Trust IV 10,310 10,310 December 15, 2035 December 15, 2010 Floats 3MO LIBOR + 1.44% EFSC Statutory Trust V 4,124 4,124 September 15, 2036 September 15, 2011 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VI 14,433 14,433 March 30, 2037 March 30, 2012 Floats 3MO LIBOR + 1.60% EFSC Capital Trust VII 4,124 4,124 December 15, 2037 December 15, 2012 Floats 3MO LIBOR + 2.25% JEFFCO Stat Trust I (2) 7,786 7,886 February 22, 2031 February 22, 2011 Fixed 10.20% JEFFCO Stat Trust II (2) 4,429 4,388 March 17, 2034 March 17, 2009 Floats 3MO LIBOR + 2.75% Trinity Capital Trust III (2) 5,256 5,206 September 8, 2034 September 8, 2009 Floats 3MO LIBOR + 2.70% Trinity Capital Trust IV (2) 10,310 10,302 November 23, 2035 August 23, 2010 Fixed 6.88% Trinity Capital Trust V (2) 7,665 7,543 December 15, 2036 September 15, 2011 Floats 3MO LIBOR + 1.65% Total junior subordinated debentures 92,253 92,132 5.75% Fixed-to-floating rate subordinated notes 63,250 — June 1, 2030 June 1, 2025 Fixed 5.75% until 4.75% Fixed-to-floating rate subordinated notes 50,000 50,000 November 1, 2026 November 1, 2021 Fixed 4.75% until Debt issuance costs (1,993) (874) Total fixed-to-floating rate subordinated notes 111,257 49,126 Total subordinated debentures and notes $ 203,510 $ 141,258 (1) Callable each quarter after initial call date. (2) Purchase accounting adjustments are reflected in the balance that also impact the effective interest rate.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables present the changes in accumulated other comprehensive income after-tax by component: Three and nine months ended September 30, 2020 (in thousands) Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities Unamortized Gain (Loss) on Held-to-Maturity Securities Net Unrealized Loss on Cash Flow Hedges Total Balance, June 30, 2020 $ 27,872 $ 13,099 $ (8,162) $ 32,809 Net change $ (220) $ (705) $ 624 $ (301) Balance, September 30, 2020 $ 27,652 $ 12,394 $ (7,538) $ 32,508 Balance, December 31, 2019 $ 14,977 $ 4,934 $ (2,162) $ 17,749 Net change $ 21,325 $ (1,190) $ (5,376) $ 14,759 Transfer from available-for-sale to held-to-maturity (8,650) 8,650 — — Balance, September 30, 2020 $ 27,652 $ 12,394 $ (7,538) $ 32,508 Three and nine months ended September 30, 2019 (in thousands) Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities Unamortized Gain (Loss) on Held-to-Maturity Securities Net Unrealized Loss on Cash Flow Hedges Total Balance, June 30, 2019 $ 15,517 $ (230) $ (2,213) $ 13,074 Net change $ 6,764 $ 10 $ (637) $ 6,137 Balance, September 30, 2019 $ 22,281 $ (220) $ (2,850) $ 19,211 Balance, December 31, 2018 $ (9,047) $ (235) $ — $ (9,282) Net change $ 31,328 $ 15 $ (2,850) $ 28,493 Balance, September 30, 2019 $ 22,281 $ (220) $ (2,850) $ 19,211
Schedule of Pre-tax and After-tax Changes in the Components of Other Comprehensive Income	The following tables present the pre-tax and after-tax changes in the components of other comprehensive income: Three months ended September 30, (in thousands) 2020 2019 Pre-tax Tax effect After-tax Pre-tax Tax effect After-tax Change in unrealized gain on available-for-sale debt securities $ 125 $ 31 $ 94 $ 9,320 $ 2,302 $ 7,018 Reclassification adjustment for realized gain on sale of available-for-sale debt securities (a) (417) (103) (314) (337) (83) (254) Reclassification of (gain) loss on held-to-maturity securities (b) (936) (231) (705) 13 3 10 Change in unrealized gain (loss) on cash flow hedges arising during the period 146 36 110 (888) (219) (669) Reclassification of loss on cash flow hedges (b) 683 169 514 42 10 32 Total other comprehensive income $ (399) $ (98) $ (301) $ 8,150 $ 2,013 $ 6,137 Nine months ended September 30, 2020 2019 Pre-tax Tax effect After-tax Pre-tax Tax effect After-tax Change in unrealized gain on available-for-sale debt securities $ 28,741 $ 7,099 $ 21,642 $ 41,649 $ 10,287 $ 31,362 Reclassification adjustment for realized gain on sale of available-for-sale debt securities (a) (421) (104) (317) (45) (11) (34) Reclassification of (gain) loss on held-to-maturity securities (b) (1,580) (390) (1,190) 20 5 15 Change in unrealized loss on cash flow hedges arising during the period (8,296) (2,049) (6,247) (3,833) (947) (2,886) Reclassification of loss on cash flow hedges (b) 1,157 286 871 47 11 36 Total other comprehensive income $ 19,601 $ 4,842 $ 14,759 $ 37,838 $ 9,345 $ 28,493 (a) The pre-tax amount is reported in noninterest income/expense in the Consolidated Statements of Operations (b) The pre-tax amount is reported in interest income/expense in the Consolidated Statements of Operations

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details) $ in Millions	Sep. 30, 2020USD ($)
Other Assets [Member]
Property, Plant and Equipment [Line Items]
Accrued interest receivable	$ 24.6

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Schedule of Impact of Adoption of New Accounting Standard (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, allowance for credit loss		$ 43,288
Allowance for credit losses on held-to-maturity debt securities	$ (645)	0
Deferred tax asset		14,851
Retained earnings	$ 393,900	380,737	$ 380,737
Loans Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, allowance for credit loss		5,314,337
Unfunded Loan Commitment
Financing Receivable, Credit Quality Indicator [Line Items]
Reserve for unfunded commitments		430
Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, allowance for credit loss		28,387
Allowance for credit losses on held-to-maturity debt securities		303
Deferred tax asset		5,898
Retained earnings		(18,114)
Cumulative Effect, Period Of Adoption, Adjustment | Loans Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, allowance for credit loss		7,091
Cumulative Effect, Period Of Adoption, Adjustment | Unfunded Loan Commitment
Financing Receivable, Credit Quality Indicator [Line Items]
Reserve for unfunded commitments		2,413
Cumulative Effect, Period Of Adoption, Adjusted Balance
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, allowance for credit loss		71,675
Allowance for credit losses on held-to-maturity debt securities		303
Deferred tax asset		20,749
Retained earnings		362,623
Cumulative Effect, Period Of Adoption, Adjusted Balance | Loans Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, allowance for credit loss		5,321,428
Cumulative Effect, Period Of Adoption, Adjusted Balance | Unfunded Loan Commitment
Financing Receivable, Credit Quality Indicator [Line Items]
Reserve for unfunded commitments		2,843
Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Retained earnings		$ 18,100

Acquisition - Narrative (Detail

Acquisition - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2020	Aug. 20, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Share Price	$ 27.27
Business Combination, Consideration Transferred	$ 135.3
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		0.5061

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income as reported	$ 17,951	$ 29,069	$ 45,453	$ 63,649
Weighted average common shares outstanding (in shares)	26,217,000	26,778,000	26,290,000	25,878,000
Additional dilutive common stock equivalents (in shares)	11,000	90,000	21,000	98,000
Weighted average diluted common shares outstanding (in shares)	26,228,000	26,868,000	26,311,000	25,976,000
Basic earnings per common share (in dollars per share)	$ 0.68	$ 1.09	$ 1.73	$ 2.46
Diluted earnings per common share (in dollars per share)	$ 0.68	$ 1.08	$ 1.73	$ 2.45
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	132,000	21,000	139,000	26,000

Investments - Schedule of Avail

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	$ 327,694		$ 181,166
Gross Unrealized Gains	11,873		973
Gross Unrealized Losses	(148)		(200)
Allowance for Credit Losses	645	$ 0
Fair Value	338,774		181,939
Total securities held-to-maturity, net	327,049		181,166
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	968,598		1,115,323
Gross Unrealized Gains	37,415		21,548
Gross Unrealized Losses	(587)		(1,554)
Allowance for Credit Losses	0
Fair Value	1,005,426		1,135,317
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	9,972		9,954
Gross Unrealized Gains	228		92
Gross Unrealized Losses	0		0
Allowance for Credit Losses	0
Fair Value	10,200		10,046
Obligations of states and political subdivisions
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	95,497		11,704
Gross Unrealized Gains	1,038		170
Gross Unrealized Losses	0		0
Allowance for Credit Losses	16
Fair Value	96,519		11,874
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	355,036		207,269
Gross Unrealized Gains	11,625		6,118
Gross Unrealized Losses	(539)		(363)
Allowance for Credit Losses	0
Fair Value	366,122		213,024
Agency mortgage-backed securities
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	109,954		46,346
Gross Unrealized Gains	2,468		675
Gross Unrealized Losses	(148)		0
Allowance for Credit Losses	0
Fair Value	112,274		47,021
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	581,111		888,129
Gross Unrealized Gains	24,884		15,083
Gross Unrealized Losses	(46)		(1,191)
Allowance for Credit Losses	0
Fair Value	605,949		902,021
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	10,977		9,971
Gross Unrealized Gains	544		255
Gross Unrealized Losses	0		0
Allowance for Credit Losses	0
Fair Value	11,521		10,226
Corporate Debt Securities [Member]
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	122,243		123,116
Gross Unrealized Gains	8,367		128
Gross Unrealized Losses	0		(200)
Allowance for Credit Losses	629
Fair Value	129,981		$ 123,044
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	11,502
Gross Unrealized Gains	134
Gross Unrealized Losses	(2)
Allowance for Credit Losses	0
Fair Value	$ 11,634

Investments - Investments Class

Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available for sale, Amortized Cost
Due in one year or less	$ 3,139
Due after one year through five years	32,281
Due after five years through ten years	16,828
Due after ten years	335,239
Agency mortgage-backed securities	581,111
Amortized Cost	968,598	$ 1,115,323
Available for sale, Estimated Fair Value
Due in one year or less	3,161
Due after one year through five years	33,232
Due after five years through ten years	17,443
Due after ten years	345,641
Agency mortgage-backed securities	605,949
Available for sale, fair value	1,005,426	1,135,317
Held to maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	10,187
Due after five years through ten years	125,476
Due after ten years	82,077
Agency mortgage-backed securities	109,954
Amortized Cost	327,694	181,166
Held to maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	10,587
Due after five years through ten years	133,063
Due after ten years	82,850
Agency mortgage-backed securities	112,274
Held to maturity, fair value	$ 338,774	$ 181,939

Investments - Schedule of Unrea

Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 82,145	$ 255,984
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	587	1,319
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	41,491
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	435
Debt Securities, Available-for-sale, Unrealized Loss Position	82,145	297,475
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	587	1,754
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	57,934	56,327
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	539	363
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	57,934	56,327
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	539	363
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	21,211	131,693
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	46	756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	41,491
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	435
Debt Securities, Available-for-sale, Unrealized Loss Position	21,211	173,184
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	46	1,191
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,000	67,964
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	200
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	3,000	67,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2	$ 200

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 968,598	$ 968,598		$ 1,115,323
Securities available for sale	$ 1,005,426	1,005,426		$ 1,135,317
accumulated other comprehensive income loss available for sale securities adjustment pre tax		$ 11,500
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%	10.00%		10.00%
Securities pledged	$ 449,500	$ 449,500		$ 484,800
Mortgage-backed securities, weighted average life		3 years
Accrued interest receivable, available-for-sale securities	4,000	$ 4,000
Accrued interest receivable, held-to-maturity securities	2,400	2,400
Allowance for credit losses on held-to-maturity debt securities	645	645	$ 0
Debt Securities, Available-for-sale, Realized Gain	400
book value of securities sold available for sale	19,600	19,600
Reclassified to Held to Maturity [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	163,600	163,600
Securities available for sale	$ 175,100	$ 175,100

Loans - Summary of Portfolio Lo

Loans - Summary of Portfolio Loans by Category (Details) - Portfolio loans, net - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	$ 6,147,551	$ 5,316,953
Unearned loan fees, net	(21,244)	(2,616)
Loans, including unearned loan fees	6,126,307	5,314,337
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	3,171,916	2,361,157
Loans, including unearned loan fees	3,152,394
Commercial - investor owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	1,292,182	1,299,884
Loans, including unearned loan fees	1,292,182
Commercial - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	735,704	697,437
Loans, including unearned loan fees	735,704
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	474,727	457,273
Loans, including unearned loan fees	474,727
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	321,792	366,261
Loans, including unearned loan fees	321,792
Total real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	2,824,405	2,820,855
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	151,230	$ 134,941
Loans, including unearned loan fees	$ 149,508

Loans - Summary of Allowance fo

Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Allowance for Loan Losses [Roll Forward]
Balance	$ 43,288
Portfolio loans, net
Allowance for Loan Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	28,387
Provision for Loan, Lease, and Other Losses		$ 14,027		$ 54,113
Balance at December 31, 2019	43,288	110,270		43,288
Provision for credit losses	(1,680)	14,000	$ 1,800	54,100	$ 5,000
Charge-offs		(2,584)		(6,552)
Recoveries		1,557		5,714
Balance	69,995	123,270		123,270
Portfolio loans, net | Commercial and industrial
Allowance for Loan Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	6,494
Provision for Loan, Lease, and Other Losses		8,929		27,688
Balance at December 31, 2019	27,455	50,139		27,455
Provision for credit losses	0
Charge-offs		(2,006)		(5,372)
Recoveries		808		1,605
Balance	33,949	57,870		57,870
Portfolio loans, net | CRE - investor owned
Allowance for Loan Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	10,726
Provision for Loan, Lease, and Other Losses		4,869		10,692
Balance at December 31, 2019	5,935	25,019		5,935
Provision for credit losses	(5)
Charge-offs		(272)		(498)
Recoveries		55		2,821
Balance	16,656	29,671		29,671
Portfolio loans, net | CRE - owner occupied
Allowance for Loan Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	2,598
Provision for Loan, Lease, and Other Losses		(1,854)		1,740
Balance at December 31, 2019	4,873	11,088		4,873
Provision for credit losses	(57)
Charge-offs		(30)		(30)
Recoveries		268		348
Balance	7,414	9,472		9,472
Portfolio loans, net | Construction and land development
Allowance for Loan Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	5,183
Provision for Loan, Lease, and Other Losses		2,873		11,220
Balance at December 31, 2019	2,611	15,962		2,611
Provision for credit losses	(217)
Charge-offs		0		(31)
Recoveries		83		152
Balance	7,577	18,918		18,918
Portfolio loans, net | Residential real estate
Allowance for Loan Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	3,470
Provision for Loan, Lease, and Other Losses		(1,132)		1,623
Balance at December 31, 2019	1,280	6,333		1,280
Provision for credit losses	(1,401)
Charge-offs		(173)		(327)
Recoveries		303		686
Balance	3,349	5,331		5,331
Portfolio loans, net | Other
Allowance for Loan Losses [Roll Forward]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(84)
Provision for Loan, Lease, and Other Losses		342		1,150
Balance at December 31, 2019	1,134	1,729		1,134
Provision for credit losses	0
Charge-offs		(103)		(294)
Recoveries		40		102
Balance	$ 1,050	$ 2,008		$ 2,008

Loans - Summary of Recorded Inv

Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2019USD ($)loan	Jun. 30, 2020USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	3
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 3,933
Financing Receivable, Troubled Debt Restructuring, Premodification	3,933
Total					$ 43,288
Portfolio loans, net
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan		6	3
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 7,819	$ 520
Financing Receivable, Troubled Debt Restructuring, Premodification		7,819	$ 520
Total	123,270	123,270		$ 110,270	69,995	$ 43,288
Loans - Ending balance:
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(21,244)	(21,244)				(2,616)
Total	6,147,551	$ 6,147,551				5,316,953
Portfolio loans, net | Commercial and industrial
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan		3	0
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 7,447	$ 0
Financing Receivable, Troubled Debt Restructuring, Premodification		7,447	$ 0
Total	57,870	57,870		50,139	33,949	27,455
Loans - Ending balance:
Total	3,171,916	3,171,916				2,361,157
Portfolio loans, net | CRE - investor owned
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	29,671	29,671		25,019	16,656	5,935
Loans - Ending balance:
Total	1,292,182	$ 1,292,182				1,299,884
Portfolio loans, net | CRE - owner occupied
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan		0	1
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 0	$ 188
Financing Receivable, Troubled Debt Restructuring, Premodification		0	$ 188
Total	9,472	9,472		11,088	7,414	4,873
Loans - Ending balance:
Total	735,704	735,704				697,437
Portfolio loans, net | Construction and land development
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	18,918	18,918		15,962	7,577	2,611
Loans - Ending balance:
Total	474,727	$ 474,727				457,273
Portfolio loans, net | Residential real estate
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan		3	2
Financing Receivable, Troubled Debt Restructuring, Postmodification		$ 372	$ 332
Financing Receivable, Troubled Debt Restructuring, Premodification		372	$ 332
Total	5,331	5,331		6,333	3,349	1,280
Loans - Ending balance:
Total	321,792	321,792				366,261
Portfolio loans, net | Other
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	2,008	2,008		$ 1,729	$ 1,050	1,134
Loans - Ending balance:
Total	$ 151,230	$ 151,230				$ 134,941

Loans - Summary of Portfolio _2

Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Financing receivable, allowance for credit loss	$ 43,288
Portfolio loans, net
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		$ 16,605		$ 16,605
Total Recorded Investment		39,623		39,623			$ 26,425
Financing Receivable, Allowance for Credit Loss, Writeoff		(2,584)		(6,552)
Financing Receivable, Allowance for Credit Loss, Recovery		1,557		5,714
Financing receivable, allowance for credit loss	69,995	123,270		123,270		$ 110,270	43,288
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	28,387
Provision for credit losses	1,680	(14,000)	$ (1,800)	(54,100)	$ (5,000)
Portfolio loans, net | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		10,208		10,208
Total Recorded Investment		23,586		23,586			22,578
Financing Receivable, Allowance for Credit Loss, Writeoff		(2,006)		(5,372)
Financing Receivable, Allowance for Credit Loss, Recovery		808		1,605
Financing receivable, allowance for credit loss	33,949	57,870		57,870		50,139	27,455
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	6,494
Provision for credit losses	0
Portfolio loans, net | Commercial - investor owned
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		1,440		1,440
Total Recorded Investment		9,850		9,850			2,303
Financing Receivable, Allowance for Credit Loss, Writeoff		(272)		(498)
Financing Receivable, Allowance for Credit Loss, Recovery		55		2,821
Financing receivable, allowance for credit loss	16,656	29,671		29,671		25,019	5,935
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	10,726
Provision for credit losses	5
Portfolio loans, net | Commercial - owner occupied
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		1,511		1,511
Total Recorded Investment		1,511		1,511			213
Financing Receivable, Allowance for Credit Loss, Writeoff		(30)		(30)
Financing Receivable, Allowance for Credit Loss, Recovery		268		348
Financing receivable, allowance for credit loss	7,414	9,472		9,472		11,088	4,873
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	2,598
Provision for credit losses	57
Portfolio loans, net | Construction and land development
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		200		200
Total Recorded Investment		200		200
Financing Receivable, Allowance for Credit Loss, Writeoff		0		(31)
Financing Receivable, Allowance for Credit Loss, Recovery		83		152
Financing receivable, allowance for credit loss	7,577	18,918		18,918		15,962	2,611
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	5,183
Provision for credit losses	217
Portfolio loans, net | Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		3,246		3,246
Total Recorded Investment		4,394		4,394			1,330
Financing Receivable, Allowance for Credit Loss, Writeoff		(173)		(327)
Financing Receivable, Allowance for Credit Loss, Recovery		303		686
Financing receivable, allowance for credit loss	3,349	5,331		5,331		6,333	1,280
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	3,470
Provision for credit losses	1,401
Portfolio loans, net | Other
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Allowance		0		0
Total Recorded Investment		82		82			1
Financing Receivable, Allowance for Credit Loss, Writeoff		(103)		(294)
Financing Receivable, Allowance for Credit Loss, Recovery		40		102
Financing receivable, allowance for credit loss	1,050	$ 2,008		$ 2,008		$ 1,729	$ 1,134
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(84)
Provision for credit losses	$ 0

Loans - Narrative (Details)

Loans - Narrative (Details)	Jan. 01, 2020USD ($)	Sep. 30, 2020USD ($)loan	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)loan	Sep. 30, 2019USD ($)loan	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium)				$ 19,800,000
Post-Modification Outstanding Recorded Balance		$ 3,933,000
Financing Receivable, Modifications, Number of Contracts | loan		3
Number of loans over 90 days past due and still accruing interest | loan							0
Unadvanced commitments on impaired loans							$ 225,000
Financing Receivable, Amount Eligible for Deferred Payment		$ 690,800,000		690,800,000
Financing Receivable, Amount Eligible for Deferral of Both Principal and Interest		355,800,000		355,800,000
Financing Receivable, Amount Eligible for Deferral of Principal Only		335,000,000		335,000,000
Loans and Leases Receivable, Deferred Income		4,500,000		4,500,000
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available		2,400,000,000		2,400,000,000
Financing receivable, allowance for credit loss	$ 43,288,000
Financing Receivable, Paycheck Protection Program		838,600,000		838,600,000
Financing Receivable, Paycheck Protection Program, Net of Deferred Fees		819,100,000		819,100,000
Financing Receivable, Paycheck Protection Program, Unearned Fees		19,500,000		19,500,000
Financing Receivable, Amount Still in Deferral Status		139,400,000		139,400,000
Unadvanced Commitment on Impaired Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans		5,192,000		5,192,000			430,000
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	28,387,000
Provision for credit losses	(1,680,000)	14,000,000	$ 1,800,000	54,100,000	$ 5,000,000
Financing Receivable, Allowance for Credit Loss, Threshold of Loans Written Off	100,000
Post-Modification Outstanding Recorded Balance				$ 7,819,000	$ 520,000
Financing Receivable, Modifications, Number of Contracts | loan				6	3
Restructuring Reserve		3,635,000		$ 3,635,000			79,000
Financing Receivable, before Allowance for Credit Loss		6,147,551,000		6,147,551,000			5,316,953,000
Financing receivable, allowance for credit loss	69,995,000	123,270,000		123,270,000		$ 110,270,000	43,288,000
Non-Covered Loans | Enterprise Value Lending Portfolio Niche Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss		20,100,000		20,100,000
Non-Covered Loans | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(84,000)
Provision for credit losses	0
Restructuring Reserve		0		0			0
Financing Receivable, before Allowance for Credit Loss		151,230,000		151,230,000			134,941,000
Financing receivable, allowance for credit loss	1,050,000	2,008,000		2,008,000		$ 1,729,000	1,134,000
Non-Covered Loans | Agriculture Portfolio Niche Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss		1,800,000		1,800,000
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification Outstanding Recorded Balance		$ 3,716,000
Financing Receivable, Modifications, Number of Contracts | loan		2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default			100,000		$ 400,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default			$ 100,000		$ 400,000
Financial Asset Acquired with Credit Deterioration [Member] | Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss							$ 90,300,000
Cumulative Effect, Period Of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss	$ 28,387,000
Cumulative Effect, Period Of Adoption, Adjustment | Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss		$ 1,200,000		$ 1,200,000

Loans - Summary of Recorded I_2

Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2019loan	Dec. 31, 2019USD ($)
Financing Receivable, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	3
Non-Covered Loans
Financing Receivable, Past Due [Line Items]
Total Recorded Investment	$ 39,623	$ 39,623		$ 26,425
Recorded Investment With No Allowance	16,605	$ 16,605
Financing Receivable, Modifications, Number of Contracts | loan		6	3
Nonaccrual	35,037	$ 35,037		26,096
Restructured, accruing	3,635	3,635		79
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing	951	951		250
Non-Covered Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Recorded Investment	23,586	23,586		22,578
Recorded Investment With No Allowance	10,208	$ 10,208
Financing Receivable, Modifications, Number of Contracts | loan		3	0
Nonaccrual	19,141	$ 19,141		22,328
Restructured, accruing	3,557	3,557		0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing	888	888		250
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Past Due [Line Items]
Total Recorded Investment	9,850	9,850		2,303
Recorded Investment With No Allowance	1,440	1,440
Nonaccrual	9,850	9,850		2,303
Restructured, accruing	0	0		0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing	0	0		0
Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Past Due [Line Items]
Total Recorded Investment	1,511	1,511		213
Recorded Investment With No Allowance	1,511	$ 1,511
Financing Receivable, Modifications, Number of Contracts | loan		0	1
Nonaccrual	1,511	$ 1,511		213
Restructured, accruing	0	0		0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing	0	0		0
Non-Covered Loans | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Recorded Investment	200	200
Recorded Investment With No Allowance	200	200
Nonaccrual	200	200
Restructured, accruing	0	0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Non-Covered Loans | Residential real estate
Financing Receivable, Past Due [Line Items]
Total Recorded Investment	4,394	4,394		1,330
Recorded Investment With No Allowance	3,246	$ 3,246
Financing Receivable, Modifications, Number of Contracts | loan		3	2
Nonaccrual	4,316	$ 4,316		1,251
Restructured, accruing	78	78		79
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing	0	0		0
Non-Covered Loans | Other
Financing Receivable, Past Due [Line Items]
Total Recorded Investment	82	82		1
Recorded Investment With No Allowance	0	0
Nonaccrual	19	19		1
Restructured, accruing	0	0		0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing	$ 63	$ 63		$ 0

Loans - Summary of Recorded I_3

Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020USD ($)loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2019USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	3
Pre-Modification Outstanding Recorded Balance	$ 3,933
Post-Modification Outstanding Recorded Balance	$ 3,933
Non-Covered Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		6	3
Pre-Modification Outstanding Recorded Balance		$ 7,819	$ 520
Post-Modification Outstanding Recorded Balance		$ 7,819	$ 520
Non-Covered Loans | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3	0
Pre-Modification Outstanding Recorded Balance		$ 7,447	$ 0
Post-Modification Outstanding Recorded Balance		$ 7,447	$ 0
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		0	1
Pre-Modification Outstanding Recorded Balance		$ 0	$ 188
Post-Modification Outstanding Recorded Balance		$ 0	$ 188
Non-Covered Loans | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		3	2
Pre-Modification Outstanding Recorded Balance		$ 372	$ 332
Post-Modification Outstanding Recorded Balance		$ 372	$ 332
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	2
Pre-Modification Outstanding Recorded Balance	$ 3,716
Post-Modification Outstanding Recorded Balance	$ 3,716
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Balance	$ 217
Post-Modification Outstanding Recorded Balance	$ 217

Loans - Summary of Aging of Rec

Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 33,927
Current	6,092,380
Loans, including unearned loan fees	6,126,307	$ 5,314,337
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	17,871
Current	3,134,523
Loans, including unearned loan fees	3,152,394
CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total Past Due	9,680
Current	1,282,502
Loans, including unearned loan fees	1,292,182
CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	2,356
Current	733,348
Loans, including unearned loan fees	735,704
Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	898
Current	473,829
Loans, including unearned loan fees	474,727
Residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,994
Current	318,798
Loans, including unearned loan fees	321,792
Other
Financing Receivable, Past Due [Line Items]
Total Past Due	128
Current	149,380
Loans, including unearned loan fees	149,508
Financial Asset, 30 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	4,672
Financial Asset, 30 to 89 Days Past Due [Member] | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,558
Financial Asset, 30 to 89 Days Past Due [Member] | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total Past Due	164
Financial Asset, 30 to 89 Days Past Due [Member] | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	1,166
Financial Asset, 30 to 89 Days Past Due [Member] | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	898
Financial Asset, 30 to 89 Days Past Due [Member] | Residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	840
Financial Asset, 30 to 89 Days Past Due [Member] | Other
Financing Receivable, Past Due [Line Items]
Total Past Due	46
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	29,255
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	16,313
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | CRE - investor owned
Financing Receivable, Past Due [Line Items]
Total Past Due	9,516
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | CRE - owner occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	1,190
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Past Due	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,154
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 82

Loans - Summary of Term Loans b

Loans - Summary of Term Loans by Origination Year (Details) $ in Thousands	Sep. 30, 2020USD ($)
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,424,770
2019	522,785
2018	295,957
2017	170,849
2016	57,935
Prior	43,949
Financing Receivable, Converted	14,578
Revolving Loans	609,082
Total	3,139,905
Commercial and industrial | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,378,251
2019	499,865
2018	289,283
2017	155,369
2016	30,317
Prior	41,477
Financing Receivable, Converted	14,000
Revolving Loans	524,025
Total	2,932,587
Commercial and industrial | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	41,834
2019	11,685
2018	3,421
2017	11,619
2016	22,835
Prior	105
Financing Receivable, Converted	0
Revolving Loans	63,198
Total	154,697
Commercial and industrial | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,685
2019	11,235
2018	3,253
2017	3,861
2016	4,783
Prior	2,367
Financing Receivable, Converted	578
Revolving Loans	21,859
Total	52,621
Commercial Real Estate-Investor Owned Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	345,261
2019	283,318
2018	190,141
2017	119,947
2016	151,655
Prior	163,352
Financing Receivable, Converted	4,969
Revolving Loans	33,539
Total	1,292,182
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	338,563
2019	277,705
2018	180,534
2017	119,492
2016	138,823
Prior	158,678
Financing Receivable, Converted	4,969
Revolving Loans	33,539
Total	1,252,303
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,634
2019	5,115
2018	1,245
2017	0
2016	12,584
Prior	3,609
Financing Receivable, Converted	0
Revolving Loans	0
Total	29,187
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	64
2019	498
2018	8,362
2017	455
2016	248
Prior	1,065
Financing Receivable, Converted	0
Revolving Loans	0
Total	10,692
Commercial Real Estate-Owner Occupied Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	203,348
2019	190,148
2018	85,066
2017	78,128
2016	52,222
Prior	77,372
Financing Receivable, Converted	2,715
Revolving Loans	46,705
Total	735,704
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	192,320
2019	184,427
2018	80,269
2017	72,465
2016	43,855
Prior	68,277
Financing Receivable, Converted	2,715
Revolving Loans	43,882
Total	688,210
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	10,628
2019	5,213
2018	259
2017	4,851
2016	8,367
Prior	4,946
Financing Receivable, Converted	0
Revolving Loans	2,823
Total	37,087
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	400
2019	508
2018	4,538
2017	812
2016	0
Prior	4,149
Financing Receivable, Converted	0
Revolving Loans	0
Total	10,407
Construction Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	150,492
2019	152,879
2018	92,351
2017	29,532
2016	11,676
Prior	12,281
Financing Receivable, Converted	0
Revolving Loans	25,516
Total	474,727
Construction Real Estate Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	147,206
2019	152,879
2018	77,811
2017	18,076
2016	11,676
Prior	11,899
Financing Receivable, Converted	0
Revolving Loans	25,516
Total	445,063
Construction Real Estate Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,064
2019	0
2018	14,540
2017	11,456
2016	0
Prior	348
Financing Receivable, Converted	0
Revolving Loans	0
Total	29,408
Construction Real Estate Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	222
2019	0
2018	0
2017	0
2016	0
Prior	34
Financing Receivable, Converted	0
Revolving Loans	0
Total	256
Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	39,349
2019	32,024
2018	21,727
2017	17,643
2016	32,917
Prior	110,771
Financing Receivable, Converted	921
Revolving Loans	65,513
Total	320,865
Residential Portfolio Segment | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	38,603
2019	30,290
2018	20,571
2017	17,630
2016	32,011
Prior	105,538
Financing Receivable, Converted	644
Revolving Loans	64,662
Total	309,949
Residential Portfolio Segment | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	212
2019	852
2018	828
2017	0
2016	0
Prior	2,122
Financing Receivable, Converted	277
Revolving Loans	801
Total	5,092
Residential Portfolio Segment | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	534
2019	882
2018	328
2017	13
2016	906
Prior	3,111
Financing Receivable, Converted	0
Revolving Loans	50
Total	5,824
Other
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,762
2019	13,512
2018	20,135
2017	554
2016	3,567
Prior	31,242
Financing Receivable, Converted	9
Revolving Loans	52,283
Total	145,064
Other | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,762
2019	13,492
2018	20,109
2017	551
2016	3,567
Prior	28,539
Financing Receivable, Converted	0
Revolving Loans	52,276
Total	142,296
Other | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1
2018	5
2017	0
2016	0
Prior	2,685
Financing Receivable, Converted	0
Revolving Loans	1
Total	2,692
Other | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	19
2018	21
2017	3
2016	0
Prior	18
Financing Receivable, Converted	9
Revolving Loans	6
Total	$ 76

Loans - Summary of Performing a

Loans - Summary of Performing and Non Performing Loans (Details) $ in Thousands	Sep. 30, 2020USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	$ 17,860
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	17,733
Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	127
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	12,489
Commercial and industrial | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	12,425
Commercial and industrial | Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	64
Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	927
Residential Portfolio Segment | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	927
Residential Portfolio Segment | Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	0
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	4,444
Other | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	4,381
Other | Non Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Investment on loans by payment activity	$ 63

Loans - Summary of Recorded I_4

Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	$ 39,623	$ 26,425
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	22,417
Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	4,408
Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	405
Other Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	18
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	23,586	22,578
Commercial and industrial | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	11,056
Commercial and industrial | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Commercial and industrial | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	405
Commercial and industrial | Other Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	9,850	2,303
CRE - investor owned | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	9,850
CRE - investor owned | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
CRE - investor owned | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
CRE - investor owned | Other Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	1,511	213
CRE - owner occupied | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	1,511
CRE - owner occupied | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
CRE - owner occupied | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
CRE - owner occupied | Other Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	200
Construction and land development | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Construction and land development | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	200
Construction and land development | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Construction and land development | Other Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	4,394	1,330
Residential real estate | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Residential real estate | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	4,208
Residential real estate | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Residential real estate | Other Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	82	1
Other | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Other | Residential Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Other | Blanket Lien
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0
Other | Other Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	$ 18
Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		4,954,405
Pass (1-6) | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,151,084
Pass (1-6) | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		1,242,569
Pass (1-6) | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		643,276
Pass (1-6) | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		437,134
Pass (1-6) | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		348,246
Pass (1-6) | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		132,096
Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		187,656
Watch (7) | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		124,718
Watch (7) | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		17,572
Watch (7) | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		28,773
Watch (7) | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		12,140
Watch (7) | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		4,450
Watch (7) | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		3
Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		81,987
Classified (8 & 9) | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		70,021
Classified (8 & 9) | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,840
Classified (8 & 9) | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		6,473
Classified (8 & 9) | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		106
Classified (8 & 9) | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,496
Classified (8 & 9) | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		51
Total*
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		5,224,048
Total* | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		2,345,823
Total* | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		1,262,981
Total* | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		678,522
Total* | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		449,380
Total* | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		355,192
Total* | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees		$ 132,150

Commitments (Details)

Commitments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Unadvanced Commitment on Impaired Loan
Schedule of Commitments [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans	$ 5,192	$ 430
Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	1,733,591	1,469,413
Commitments to extend credit | Fixed Rate Loan Commitment
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	170,000	144,800
Letters of credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 47,206	$ 47,969
Letters of credit | Maximum
Schedule of Commitments [Line Items]
Remaining term	3 years 5 months
Letters of credit | Minimum
Schedule of Commitments [Line Items]
Remaining term	1 month

Derivative Financial Instrume_3

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2019
Securities Sold under Agreements to Repurchase [Abstract]
Gross Amounts Recognized	$ 209,038		$ 230,886
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Liabilities presented in the Statement of Financial Position	209,038		230,886
Financial Instruments	0		0
Fair Value Collateral Posted	209,038		230,886
Net Amount	0		0
Fair value of derivatives in a net liability position	45,200
Posted collateral	45,500
Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Asset derivatives (other assets), fair value	33,999		11,055
Liability derivatives (other liabilities), fair value	44,240		14,747
Derivative Asset [Abstract]
Gross Amounts Offset in the Statement of Financial Position	0		0
Derivative financial instruments	33,999		11,055
Financial Instruments	2		56
Fair Value Collateral Posted	0		0
Net Amount	33,997		10,999
Derivative Liability [Abstract]
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Liabilities presented in the Statement of Financial Position	44,240		14,747
Financial Instruments	2		56
Fair Value Collateral Posted	44,063		14,573
Net Amount	175		118
Derivatives Designated as Hedging Instruments: | Other Assets [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	261,962		61,962
Asset derivatives (other assets), fair value	0		0
Derivatives Designated as Hedging Instruments: | Other Liabilities [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Liability derivatives (other liabilities), fair value	10,011		2,872
Derivatives not Designated as Hedging Instruments: | Other Assets [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	1,044,139		749,819
Asset derivatives (other assets), fair value	33,999		11,055
Derivatives not Designated as Hedging Instruments: | Other Liabilities [Member] | Interest rate swap
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Liability derivatives (other liabilities), fair value	$ 34,229		$ 11,875
Cash Flow Hedging | Subordinated Debt [Member]
Derivative [Line Items]
Derivative, Variable Interest Rate	2.62%
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	$ 62,000
Cash Flow Hedging | Federal Home Loan Bank Overnight Advances [Member]
Derivative [Line Items]
Derivative, fixed rate	1.12%
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	$ 100,000
Cash Flow Hedging | Federal Home Loan Bank 3 Month Advances [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset, Notional Amount	$ 100,000
Maximum | Cash Flow Hedging | Subordinated Debt [Member]
Derivative [Line Items]
Cash flow hedge term	6 years
Maximum | Cash Flow Hedging | Federal Home Loan Bank Overnight Advances [Member]
Derivative [Line Items]
Cash flow hedge term	3 years
Maximum | Cash Flow Hedging | Federal Home Loan Bank 3 Month Advances [Member]
Derivative [Line Items]
Cash flow hedge term	5 years
Scenario, Forecast | Cash Flow Hedging
Derivative [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income		$ 2,900

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Securities available for sale	$ 1,005,426	$ 1,135,317
Estimate of Fair Value Measurement [Member]
Assets
State tax credits held for sale	48,327	39,046
Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	10,200	10,046
Obligations of states and political subdivisions
Assets
Securities available for sale	366,122	213,024
Agency mortgage-backed securities
Assets
Securities available for sale	605,949	902,021
US Treasury Bill Securities [Member]
Assets
Securities available for sale	11,521	10,226
Corporate Debt Securities [Member]
Assets
Securities available for sale	11,634
Recurring basis | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	1,005,426	1,135,317
Derivatives	33,999	11,055
Total assets	1,039,425	1,146,372
Liabilities
Derivatives	44,240	14,747
Total liabilities	44,240	14,747
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	10,200	10,046
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	366,122	213,024
Recurring basis | Agency mortgage-backed securities | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	605,949	902,021
Recurring basis | US Treasury Bill Securities [Member] | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	11,521	10,226
Recurring basis | Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	11,634
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Derivatives	0	0
Total assets	0	0
Liabilities
Derivatives	0	0
Total liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency mortgage-backed securities
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Bill Securities [Member]
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Debt Securities [Member]
Assets
Securities available for sale	0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	1,005,426	1,135,317
Derivatives	33,999	11,055
Total assets	1,039,425	1,146,372
Liabilities
Derivatives	44,240	14,747
Total liabilities	44,240	14,747
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	10,200	10,046
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets
Securities available for sale	366,122	213,024
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency mortgage-backed securities
Assets
Securities available for sale	605,949	902,021
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Bill Securities [Member]
Assets
Securities available for sale	11,521	10,226
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate Debt Securities [Member]
Assets
Securities available for sale	11,634
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Derivatives	0	0
Total assets	0	0
Liabilities
Derivatives	0	0
Total liabilities	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions
Assets
Securities available for sale	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Agency mortgage-backed securities
Assets
Securities available for sale	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | US Treasury Bill Securities [Member]
Assets
Securities available for sale	0	$ 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate Debt Securities [Member]
Assets
Securities available for sale	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments, at cost	$ 43,456	$ 38,044
Estimated fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	$ 48,327	$ 39,046

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2020USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Change in Fair Value, Gains (Losses) in Period	$ 2,036	$ 5,756
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Change in Fair Value, Gains (Losses) in Period	1,788	4,756
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Change in Fair Value, Gains (Losses) in Period	248	1,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Significant Other Observable Inputs (Level 2) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	5,239	5,239
Significant Unobservable Inputs (Level 3) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,639	1,639
Significant Unobservable Inputs (Level 3) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	3,600	3,600
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	5,239	5,239
Estimate of Fair Value Measurement [Member] | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,639	1,639
Estimate of Fair Value Measurement [Member] | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	$ 3,600	$ 3,600

Fair Value Measurements - Sum_3

Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Balance sheet assets
Securities available for sale	$ 1,005,426	$ 1,135,317
Securities held-to-maturity, net	327,694	181,166
Carrying Amount
Balance sheet assets
Securities held-to-maturity, net	327,049	181,166
Other investments	43,456	38,044
Loans held for sale	14,032	5,570
Loans, net	6,003,037	5,271,049
State tax credits held for sale	42,497	36,802
Balance sheet liabilities
Certificates of deposit	612,045	826,447
Subordinated debentures and notes	203,510	141,258
FHLB advances	250,000	222,406
Other borrowings and notes payable	239,038	265,172
Estimated fair value
Balance sheet assets
Securities held-to-maturity, net	338,774	181,939
Other investments	43,456	38,044
Loans held for sale	14,032	5,570
Loans, net	5,961,862	5,205,651
State tax credits held for sale	48,327	39,046
Balance sheet liabilities
Certificates of deposit	617,277	825,203
Subordinated debentures and notes	193,059	130,985
FHLB advances	251,942	221,402
Other borrowings and notes payable	$ 239,038	$ 265,172

Subordinated Debentures (Detail

Subordinated Debentures (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 203,510	$ 141,258
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	92,253	92,132
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Clayco Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 3,196	3,196
Subordinated Borrowing, Due Date	Dec. 17, 2033
Subordinated Borrowing, Call Date	Dec. 17, 2008
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Clayco Statutory Trust I [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0285
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 5,155	5,155
Subordinated Borrowing, Due Date	Jun. 17, 2034
Subordinated Borrowing, Call Date	Jun. 17, 2009
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Capital Trust II [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0265
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Statutory Trust III [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 11,341	11,341
Subordinated Borrowing, Due Date	Dec. 15, 2034
Subordinated Borrowing, Call Date	Dec. 15, 2009
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Statutory Trust III [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0197
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Clayco Statutory Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 4,124	4,124
Subordinated Borrowing, Due Date	Sep. 15, 2035
Subordinated Borrowing, Call Date	Sep. 15, 2010
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Clayco Statutory Trust II [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0183
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Statutory Trust IV [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 10,310	10,310
Subordinated Borrowing, Due Date	Dec. 15, 2035
Subordinated Borrowing, Call Date	Dec. 15, 2010
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Statutory Trust IV [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0144
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Statutory Trust V [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 4,124	4,124
Subordinated Borrowing, Due Date	Sep. 15, 2036
Subordinated Borrowing, Call Date	Sep. 15, 2011
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Statutory Trust V [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0160
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Capital Trust VI [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 14,433	14,433
Subordinated Borrowing, Due Date	Mar. 30, 2037
Subordinated Borrowing, Call Date	Mar. 30, 2012
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Capital Trust VI [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0160
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Capital Trust VII [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 4,124	4,124
Subordinated Borrowing, Due Date	Dec. 15, 2037
Subordinated Borrowing, Call Date	Dec. 15, 2012
Trust Preferred Securities Subject to Mandatory Redemption [Member] | EFSC Capital Trust VII [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0225
Trust Preferred Securities Subject to Mandatory Redemption [Member] | JEFFCO Stat Trust I [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 7,786	7,886
Subordinated Borrowing, Due Date	Feb. 22, 2031
Subordinated Borrowing, Call Date	Feb. 22, 2011
Subordinated Borrowing, Interest Rate	10.20%
Trust Preferred Securities Subject to Mandatory Redemption [Member] | JEFFCO Stat Trust II [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 4,429	4,388
Subordinated Borrowing, Due Date	Mar. 17, 2034
Subordinated Borrowing, Call Date	Mar. 17, 2009
Trust Preferred Securities Subject to Mandatory Redemption [Member] | JEFFCO Stat Trust II [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Interest Rate	2.75%
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Trinity Capital Trust III [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 5,256	5,206
Subordinated Borrowing, Due Date	Sep. 8, 2034
Subordinated Borrowing, Call Date	Sep. 8, 2009
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Trinity Capital Trust III [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0270
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Trinity Capital Trust IV [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 10,310	10,302
Subordinated Borrowing, Due Date	Nov. 23, 2035
Subordinated Borrowing, Call Date	Aug. 23, 2010
Subordinated Borrowing, Interest Rate	6.88%
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Trinity Capital Trust V [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 7,665	7,543
Subordinated Borrowing, Due Date	Dec. 15, 2036
Subordinated Borrowing, Call Date	Sep. 15, 2011
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Trinity Capital Trust V [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0165
Senior Subordinated Notes [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Interest Rate	4.75%
Payments of Debt Issuance Costs	$ 1,993	874
Subordinated notes, net of issuance costs	$ 111,257	49,126
Senior Subordinated Notes [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.03387
Senior Subordinated Notes [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Basis Spread on Variable Rate	0.0566
5.75% [Member] | Senior Subordinated Notes [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 63,250	0
Subordinated Borrowing, Due Date	Jun. 1, 2030
Subordinated Borrowing, Call Date	Jun. 1, 2025
Subordinated Borrowing, Interest Rate	5.75%
4.75% [Member] | Senior Subordinated Notes [Member]
Subordinated Borrowing [Line Items]
Subordinated debentures and notes	$ 50,000	$ 50,000
Subordinated Borrowing, Due Date	Nov. 1, 2026
Subordinated Borrowing, Call Date	Nov. 1, 2021

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income After-tax By Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 867,963	$ 825,501	$ 867,185	$ 603,804
Ending balance	882,267	846,095	882,267	846,095
Net Unrealized Gain (Loss) on Available-for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	27,872	15,517	14,977	(9,047)
Net change	(220)	6,764	21,325	31,328
Ending balance	27,652	22,281	27,652	22,281
Debt Securities, Held-to-maturity, Transfer, Derivative Hedge, Gain (Loss)			(8,650)
Unamortized Gain (Loss) on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	13,099	(230)	4,934	(235)
Net change	(705)	10	(1,190)	15
Ending balance	12,394	(220)	12,394	(220)
Debt Securities, Held-to-maturity, Transfer, Derivative Hedge, Gain (Loss)			8,650
Net Unrealized Loss on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,162)	(2,213)	(2,162)	0
Net change	624	(637)	(5,376)	(2,850)
Ending balance	(7,538)	(2,850)	(7,538)	(2,850)
Debt Securities, Held-to-maturity, Transfer, Derivative Hedge, Gain (Loss)			0
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	32,809	13,074	17,749	(9,282)
Net change	(301)	6,137	14,759	28,493
Ending balance	$ 32,508	$ 19,211	32,508	$ 19,211
Debt Securities, Held-to-maturity, Transfer, Derivative Hedge, Gain (Loss)			$ 0

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Pre-tax and After-tax Changes in the Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax [Abstract]
Change in unrealized gain on available-for-sale debt securities, before tax	$ 125	$ 9,320	$ 28,741	$ 41,649
Change in unrealized gain on available-for-sale debt securities, tax	31	2,302	7,099	10,287
Change in unrealized gain on available-for-sale debt securities, after tax	94	7,018	21,642	31,362
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, before tax	(417)	(337)	(421)	(45)
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, tax	(103)	(83)	(104)	(11)
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, after tax	314	254	317	34
Other Comprehensive Loss, Held-to-maturity Security, OTTI, after Tax and Adjustments [Abstract]
Reclassification of (gain) loss on held-to-maturity securities, before tax	(936)	13	(1,580)	20
Reclassification of (gain) loss on held-to-maturity securities, tax	(231)	3	(390)	5
Reclassification of (gain) loss on held-to-maturity securities, after tax	(705)	10	(1,190)	15
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract]
Change in unrealized loss on cash flow hedges arising during the period, before tax	146	(888)	(8,296)	(3,833)
Change in unrealized loss on cash flow hedges arising during the period, tax	36	(219)	(2,049)	(947)
Change in unrealized loss on cash flow hedges arising during the period, after tax	110	(669)	(6,247)	(2,886)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Reclassification of loss on cash flow hedges, before tax	683	42	1,157	47
Reclassification of loss on cash flow hedges, tax	169	10	286	11
Reclassification of loss on cash flow hedges, after tax	(514)	(32)	(871)	(36)
OCI, Net of Tax [Abstract]
Total other comprehensive income, before tax	(399)	8,150	19,601	37,838
Total other comprehensive income, tax	(98)	2,013	4,842	9,345
Total other comprehensive income (loss), after-tax	$ (301)	$ 6,137	$ 14,759	$ 28,493