Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income:
Loans and leases, including fees	$ 92,770	$ 91,726	$ 182,231	$ 183,521
Investment securities:
Investment securities available-for-sale	17,042	9,410	29,874	18,569
Investment securities held-to-maturity	11,714	5,130	22,377	9,070
Total investment income	28,756	14,540	52,251	27,639
Dividends from FHLB stock	273	283	644	500
Interest-earning deposits with other institutions	1,463	479	2,236	892
Total interest income	123,262	107,028	237,362	212,552
Interest expense:
Deposits	1,201	1,425	2,328	3,237
Borrowings and customer repurchase agreements	121	132	254	273
Junior subordinated debentures		83		186
Total interest expense	1,322	1,640	2,582	3,696
Net interest income before (recapture of) provision for credit losses	121,940	105,388	234,780	208,856
Provision for (recapture of) credit losses	3,600	(2,000)	6,100	(21,500)
Net interest income after (recapture of)  provision for credit losses	118,340	107,388	228,680	230,356
Noninterest income:
BOLI income	603	1,240	1,952	5,864
Gain on OREO, net		48		477
Gain on sale of building, net	(2,717)		(2,717)
Other	2,745	1,679	4,363	3,361
Total noninterest income	14,670	10,836	25,934	24,517
Noninterest expense:
Salaries and employee benefits	31,553	28,836	64,209	58,542
Occupancy and equipment	5,567	4,949	11,138	9,812
Professional services	2,305	2,248	4,350	4,416
Computer software expense	3,103	2,657	6,898	5,501
Marketing and promotion	1,638	1,799	3,096	2,524
Amortization of intangible assets	1,998	2,167	3,996	4,334
(Recapture of) provision for unfunded loan commitments	0	(1,000)	0	(1,000)
Acquisition related expenses	375		6,013
Other	4,332	4,889	9,409	9,579
Total noninterest expense	50,871	46,545	109,109	93,708
Earnings before income taxes	82,139	71,679	145,505	161,165
Income taxes	23,081	20,500	40,887	46,093
Net earnings	59,058	51,179	104,618	115,072
Other comprehensive (loss) income:
Unrealized gain (loss) on securities arising during the period, before tax	(142,790)	8,937	(344,809)	(31,373)
Less: Income tax benefit (expense) related to items of other comprehensive (loss) income	42,213	(2,642)	101,938	9,275
Other comprehensive (loss) income, net of tax	(100,577)	6,295	(242,871)	(22,098)
Comprehensive (loss) income	$ (41,519)	$ 57,474	$ (138,253)	$ 92,974
Basic earnings per common share	$ 0.42	$ 0.38	$ 0.74	$ 0.85
Diluted earnings per common share	$ 0.42	$ 0.38	$ 0.74	$ 0.85
Service Charges on Deposit Accounts [Member]
Noninterest income:
Revenue from contract with customer, including assessed tax	$ 5,333	$ 4,169	$ 10,392	$ 8,154
Trust and Investment Services [Member]
Noninterest income:
Revenue from contract with customer, including assessed tax	2,962	3,167	5,784	5,778
Bankcard Services [Member]
Noninterest income:
Revenue from contract with customer, including assessed tax	$ 310	$ 533	$ 726	$ 883