Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 125,211	$ 130,353	$ 71,289
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	3,863	3,757	4,244
Provision for (reversal of) credit losses	17,750	(5,500)	41,000
Amortization of intangibles	1,685	1,981	2,559
Net accretion of loans	(3,178)	(5,350)	(6,687)
Accretion on bank premises	(49)	(73)	(90)
Accretion on deposits	(777)	(2,224)	(4,301)
Amortization (accretion) on borrowings	40	(36)	(183)
Net deferred income tax (benefit) expense	(403)	16	(7,495)
Stock-based compensation	4,889	4,536	2,949
Gains on sales/redemptions of investment securities, net	0	(195)	(29)
Change in fair value of equity securities, net	1,521	373	(202)
Gain on sale of loans held-for-sale, net	(1,695)	(3,807)	(2,085)
Gain on sale of branches	0	(674)	0
Net losses on disposition of other fixed assets	22	65	0
Gain (loss) on sale of other real estate owned	6	(18)	0
Loans originated for resale	(21,128)	(51,669)	(63,114)
Proceeds from sale of loans held-for-sale	28,341	72,233	80,323
Increase in cash surrender value of bank owned life insurance	(5,597)	(4,771)	(4,793)
Amortization of premiums and accretion of discounts on investments securities, net	2,155	5,966	5,506
Amortization of subordinated debt issuance costs	304	303	323
(Increase) decrease in accrued interest receivable	(11,910)	1,165	(11,458)
Net change in operating leases	(182)	(769)	41
(Increase) decrease in other assets	(12,413)	46,086	(22,498)
Increase (decrease) in other liabilities	48,322	10,526	(4,174)
Net cash provided by operating activities	176,777	202,273	81,125
Cash flows from investing activities
Purchases	(339,059)	(349,500)	(338,087)
Sales	0	0	19,624
Maturities, calls and principal repayments	150,287	285,873	256,782
Net (purchases)/redemptions of restricted investment in bank stocks	(18,778)	(2,727)	5,362
Purchases of equity securities	(3,538)	(780)	(2,000)
Loans held-for-sale payments	54	38	1,186
Net increase in loans	(1,292,938)	(596,389)	(329,210)
Cash flow hedge premium payment	(6,965)	0	0
Purchases of premises and equipment	(3,301)	(2,783)	(2,199)
Purchases of bank owned life insurance	(30,000)	(25,000)	(25,000)
Proceeds from life insurance death benefits	0	0	1,794
Proceeds from disposition of fixed assets	697	113	0
Proceeds from sale of branches	0	974	0
Cash and cash equivalents acquired in acquisitions, net	0	0	87,391
Proceeds from sale of other real estate owned	309	321	992
Net cash used in investing activities	(1,543,232)	(689,860)	(323,365)
Cash flows from financing activities
Net increase in deposits	1,024,446	375,953	410,605
(Repayment of) increase in subordinated debt	0	(50,000)	73,440
Advances of FHLB borrowings	4,203,181	340,000	1,526,489
Repayments of FHLB borrowings	(3,813,792)	(297,725)	(1,650,387)
Cash dividends paid on preferred stock	(6,037)	(1,717)	0
Cash dividends paid on common stock	(23,428)	(17,493)	(14,317)
Proceeds from preferred stock offering	0	110,927	0
Purchase of treasury stock	(13,127)	(9,401)	(911)
Proceeds from exercise of stock options	124	106	233
Share redemption for tax withholdings on performance units and deferred stock units earned	(2,133)	(1,283)	(639)
Net cash provided by financing activities	1,369,234	449,367	344,513
Net change in cash and cash equivalents	2,779	(38,220)	102,273
Cash and cash equivalents at beginning of period	265,536	303,756	201,483
Cash and cash equivalents at end of period	268,315	265,536	303,756
Supplemental disclosures of cash flow information:
Interest paid	67,850	41,787	74,701
Income taxes paid	49,234	45,431	26,548
Supplemental disclosures of noncash investing activities:
Transfer of loans to other real estate owned	579	304	0
Transfer of loans held-for-sale to loans held-for-investment	8,043	4,293	10,995
Transfer of loans held-for-investment to loans held-for-sale	$ 27,137	$ 16,628	$ 26,548