Consolidated Statements of Cash Flows - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 194,059	$ 203,043	$ 133,055
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,090	5,573	6,147
Provision (benefit) for credit losses	36,605	(611)	13,385
Deferred income taxes	2,380	2,194	545
Net amortization of debt securities	3,998	5,639	7,343
Net amortization (accretion) on loans	3,775	266	(1,140)
Amortization of intangible assets	4,601	5,367	5,690
Amortization of servicing assets	1,648	3,066	2,311
Mortgage loans originated-for-sale	(19,610)	(67,470)	(159,670)
Proceeds from mortgage loans sold	20,585	73,014	163,864
Investment securities	(601)	0	0
Loans sold	(2,015)	0	0
Other real estate	(187)	93	(931)
Fixed assets	(46)	(54)	0
State tax credits	(904)	(1,506)	(2,220)
Asset impairment	0	0	3,441
Share-based compensation	10,146	8,006	6,017
Changes in other assets and liabilities, net	8,714	(19,980)	(17,262)
Net cash provided by operating activities	268,238	216,640	160,575
Cash flows from investing activities:
Net cash paid for acquisitions and dispositions	0	0	212,642
Net (increase) decrease in loans	(1,238,276)	(722,677)	138,455
Sale of debt securities, available-for-sale	40,393	0	27,135
Paydown or maturity of debt securities, available-for-sale	233,105	238,909	306,360
Paydown or maturity of debt securities, held-to-maturity	9,135	11,913	49,947
Redemption of other investments	92,879	12,989	18,159
Sale of loans	44,975	0	0
Sale of state tax credits held-for-sale	4,592	20,645	18,507
Sale of other real estate	457	2,517	5,915
Sale of fixed assets	357	1,699	0
Settlement of bank-owned life insurance policies	1,155	534	0
Payments for the purchase of:
Available-for-sale debt securities	(318,797)	(728,247)	(779,481)
Held-to-maturity debt securities	(56,365)	(182,004)	0
Other investments	(114,746)	(19,286)	(9,564)
State tax credits held-for-sale	(90)	(18,846)	(8,689)
Fixed assets	(6,556)	(1,930)	(2,500)
Net cash used in investing activities	(1,307,782)	(1,383,784)	(23,114)
Cash flows from financing activities:
Net (decrease) increase in noninterest-bearing deposit accounts	(683,989)	64,296	869,203
Net (decrease) increase in interest-bearing deposit accounts	2,031,210	(578,945)	648,778
Payments for the redemption of subordinated notes	0	0	(50,000)
Net increase (decrease) in short term FHLB advances, net	(100,000)	100,000	(160,000)
Repayments of long-term FHLB advances	0	(50,000)	0
Repayments of notes payable	(5,714)	(5,714)	(7,143)
Net (decrease) increase in other borrowings	(20,576)	(24,030)	59,925
Dividends paid on common stock	(37,368)	(33,602)	(26,153)
Repurchase of common stock	0	(32,923)	(60,589)
Dividends paid on preferred stock	(3,750)	(4,041)	0
Proceeds from issuance of preferred stock, net	0	0	71,988
Other, net	1,401	1,773	516
Net cash provided by (used in) financing activities	1,181,214	(563,186)	1,346,525
Net (decrease) increase in cash and cash equivalents	141,670	(1,730,330)	1,483,986
Cash and cash equivalents, beginning of period	291,359	2,021,689	537,703
Cash and cash equivalents, end of period	433,029	291,359	2,021,689
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	195,392	40,736	23,957
Cash paid during the period for income taxes	50,117	46,009	56,845
Noncash investing and financing transactions:
Real Estate Owned, Transfer to Real Estate Owned	6,933	0	3,227
Sales of other real estate financed	0	0	228
Transfer of securities from available-for-sale to held-to-maturity	0	116,927	0
Transfer to loans from fixed assets for building sale and leaseback	1,460	0	0
Right-of-use assets obtained in exchange for lease obligations	15,640	9,512	5,658
Leasehold improvement allowance in other assets	$ 2,483	$ 0	$ 0
Common shares issued in connection with acquisitions	0	0	343,650