Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 55,738	$ 47,693
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,274	1,472
Provision (benefit) for credit losses	4,183	(4,068)
Deferred income taxes	2,517	5,248
Net amortization of discount/premiums on debt securities	1,070	1,625
Net amortization on loan discount/premiums	1,606	429
Amortization of intangible assets	1,239	1,429
Amortization of servicing assets	493	648
Mortgage loans originated-for-sale	(2,918)	(27,811)
Proceeds from mortgage loans sold	3,884	29,636
Sale of investment securities	(381)	0
Sale of SBA loans	(501)	0
Sale of other real estate	(90)	(19)
Sale of state tax credits	(91)	(9)
Share-based compensation	2,469	1,686
Net change in other assets and liabilities
Net change in other assets and liabilities	(1,316)	(8,076)
Net cash provided by operating activities	69,176	49,883
Cash flows from investing activities:
Net increase in loans	(285,158)	(39,536)
Sale of debt securities, available-for-sale	28,741	0
Paydown or maturity of debt securities, available-for-sale	65,725	63,506
Paydown or maturity of debt securities, held-to-maturity	2,037	5,097
Redemption of other investments	41,109	1,248
Sale of SBA loans	9,502	0
Sale of state tax credits held for sale	504	261
Sale of other real estate	360	1,419
Sale of fixed assets	43	0
Settlement of bank-owned life insurance policies	0	534
Payments for the purchase of:
Available-for-sale debt securities	(86,737)	(313,875)
Held-to-maturity debt securities	(14,602)	(1,120)
Other investments	(39,123)	(8,154)
State tax credits held for sale	(21)	(7,212)
Fixed assets	(681)	(457)
Net cash used in investing activities	(278,301)	(298,289)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposit accounts	(450,209)	302,607
Net increase in interest-bearing deposit accounts	775,695	57,729
Repayments of notes payable	(1,429)	(1,429)
Net decrease in other borrowings	(109,201)	(123,589)
Repurchase of common stock	0	(16,974)
Cash dividends paid on common stock	(9,328)	(7,915)
Cash dividends paid on preferred stock	(938)	(1,229)
Other	(1,741)	(1,163)
Net cash provided by financing activities	202,849	208,037
Net decrease in cash and cash equivalents	(6,276)	(40,369)
Cash and cash equivalents, beginning of period	291,359	2,021,689
Cash and cash equivalents, end of period	285,083	1,981,320
Noncash investing and financing transactions:
Cash paid during the period for interest	27,486	4,725
Cash paid during period for income taxes	0	979
Right-of-use assets obtained in exchange for lease obligations	564	4,178
Transfer of securities from available-for-sale to held-to-maturity	$ 0	$ 116,927