Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 104,865	$ 92,842
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	2,547	2,891
Provision (benefit) for credit losses	10,522	(3,410)
Deferred income taxes	776	4,644
Net amortization of discount/premiums on debt securities	2,039	3,157
Net amortization on loan discount/premiums	2,108	(633)
Amortization of intangible assets	2,375	2,758
Amortization of servicing assets	1,006	1,693
Mortgage loans originated-for-sale	(9,578)	(43,352)
Proceeds from mortgage loans sold	10,279	44,789
Sale of investment securities	(381)	0
Sale of SBA loans	(501)	0
Sale of other real estate	(188)	71
Sale of fixed assets	10	0
Sale of state tax credits	(215)	(41)
Share-based compensation	5,134	3,806
Net change in other assets and liabilities	8,988	5,534
Net cash provided by operating activities	139,786	114,749
Cash flows from investing activities:
Net increase in loans	(789,370)	(251,381)
Sale of debt securities, available-for-sale	28,741	0
Paydown or maturity of debt securities, available-for-sale	119,794	127,119
Paydown or maturity of debt securities, held-to-maturity	3,623	8,671
Redemption of other investments	75,843	3,376
Sale of SBA loans	9,502	0
Sale of state tax credits held for sale	1,225	3,641
Sale of other real estate	457	1,834
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	(154,787)	(544,909)
Held-to-maturity debt securities	(21,146)	(83,283)
Other investments	(76,454)	(19,437)
State tax credits held for sale	(75)	(7,352)
Fixed assets	(1,603)	(1,004)
Net cash used in investing activities	(804,207)	(762,191)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposit accounts	(762,171)	168,042
Net increase (decrease) in interest-bearing deposit accounts	1,552,881	(419,223)
Net increase in FHLB advances	50,000	0
Repayments of notes payable	(2,857)	(2,857)
Net decrease in other borrowings	(121,872)	(124,311)
Repurchase of common stock	0	(32,923)
Cash dividends paid on common stock	(18,668)	(16,100)
Cash dividends paid on preferred stock	(1,875)	(2,167)
Other	(353)	96
Net cash provided by (used in) financing activities	695,085	(429,443)
Net increase (decrease) in cash and cash equivalents	30,664	(1,076,885)
Cash and cash equivalents, beginning of period	291,359	2,021,689
Cash and cash equivalents, end of period	322,023	944,804
Noncash investing and financing transactions:
Cash paid during the period for interest	74,691	11,873
Cash paid during period for income taxes	21,703	14,889
Right-of-use assets obtained in exchange for lease obligations	3,137	4,178
Transfer of securities from available-for-sale to held-to-maturity	$ 0	$ 116,927