Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 149,530	$ 143,042
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	3,818	4,268
Provision (benefit) for credit losses	18,552	(2,734)
Deferred income taxes	(103)	1,796
Net amortization of discount/premiums on debt securities	2,996	4,488
Net amortization on loan discount/premiums	3,819	(289)
Amortization of intangible assets	3,493	4,068
Amortization of servicing assets	1,307	2,195
Mortgage loans originated-for-sale	(14,560)	(57,281)
Proceeds from mortgage loans sold	15,648	63,266
Sale of investment securities	(381)	0
Sale of SBA loans	(2,015)	0
Sale of other real estate	(187)	93
Sale of fixed assets	10	(44)
Sale of state tax credits	(215)	(154)
Share-based compensation	7,809	5,928
Net change in other assets and liabilities	(269)	19,215
Net cash provided by operating activities	189,252	187,857
Cash flows from investing activities:
Net increase in loans	(943,905)	(337,863)
Sale of debt securities, available-for-sale	28,741	0
Paydown or maturity of debt securities, available-for-sale	171,923	183,230
Paydown or maturity of debt securities, held-to-maturity	5,086	10,819
Redemption of other investments	88,863	8,304
Sale of SBA loans	44,975	0
Sale of state tax credits held for sale	1,225	8,406
Sale of other real estate	457	2,517
Sale of fixed assets	83	1,489
Settlement of bank-owned life insurance policies	0	534
Payments for the purchase of:
Available-for-sale debt securities	(198,962)	(635,733)
Held-to-maturity debt securities	(30,893)	(115,697)
Other investments	(84,023)	(17,963)
State tax credits held for sale	(75)	(18,846)
Fixed assets	(2,193)	(1,321)
Net cash used in investing activities	(918,698)	(912,124)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposit accounts	(790,246)	64,103
Net increase (decrease) in interest-bearing deposit accounts	1,871,003	(350,308)
Repayments of long-term FHLB advances	0	(50,000)
Net decrease in FHLB advances	(100,000)	0
Repayments of notes payable	(4,286)	(4,286)
Net decrease in other borrowings	(137,461)	(152,155)
Repurchase of common stock	0	(32,923)
Cash dividends paid on common stock	(28,014)	(24,662)
Cash dividends paid on preferred stock	(2,813)	(3,104)
Other	602	789
Net cash provided by (used in) financing activities	808,785	(552,546)
Net increase (decrease) in cash and cash equivalents	79,339	(1,276,813)
Cash and cash equivalents, beginning of period	291,359	2,021,689
Cash and cash equivalents, end of period	370,698	744,876
Noncash investing and financing transactions:
Cash paid during the period for interest	129,205	22,517
Cash paid during period for income taxes	34,013	30,505
Transfer to other bank owned assets in settlement of loans	6,933	0
Right-of-use assets obtained in exchange for lease obligations	6,001	9,072
Transfer of securities from available-for-sale to held-to-maturity	$ 0	$ 116,927