Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income		$ 25,887	$ 29,048
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		1,425	2,625
Depreciation, amortization and accretion, net		3,438	5,879
Deferred income tax expense		754	2,261
Gain on sale of mortgage loans held for sale		(341)	(215)
Origination of mortgage loans held for sale+		(22,617)	(24,683)
Proceeds from sale of mortgage loans held for sale		22,552	21,107
Bank owned life insurance income	[1]	(588)	(549)
Loss on the disposal of premises and equipment	[1]	0	2
Stock compensation expense		942	1,152
Excess tax expense (benefit) from share-based compensation arrangements		(4)	493
Net change in accrued interest receivable and other assets		(8,907)	3,659
Net change in accrued interest payable and other liabilities		(5,125)	(31,017)
Net cash provided by operating activities		17,416	9,762
Cash flows from investing activities:
Proceeds from maturities and paydowns of available for sale debt securities		30,325	30,681
Proceeds from maturities and paydowns of held to maturity debt securities		4,506	4,504
Purchases of FHLB stock		(9,782)	(12,298)
Proceeds from redemption of FHLB stock		1,343	0
Net change in non-PPP loans		(78,086)	(47,277)
Purchases of premises and equipment		(1,830)	(1,831)
Proceeds from sale or disposal of premises and equipment		0	103
Other investment activities		(4,498)	(255)
Net cash used in investing activities		(57,625)	(17,337)
Cash flows from financing activities:
Net change in deposits		(61,668)	(34,057)
Net change in securities sold under agreements to repurchase and federal funds purchased		6,646	(22,808)
Proceeds from FHLB advances		725,000	700,000
Repayments of FHLB advances		(725,000)	(475,000)
Repurchase of common stock		(1,638)	(2,368)
Cash dividends paid		(8,867)	(8,561)
Net cash (used in) provided by financing activities		(65,527)	157,206
Net change in cash and cash equivalents		(105,736)	149,631
Beginning cash and cash equivalents		265,959	167,367
Ending cash and cash equivalents		160,223	316,998
Supplemental cash flow information:
Interest paid		36,375	16,026
Income taxes paid, net of refunds		5,115	0
Cash paid for operating lease liabilities		1,328	1,071
Supplemental non-cash activity:
Unfunded commitments in tax credit investments		0	6,262
Receivable for proceeds from matured HTM investment security		50,000	0
Dividends payable to stockholders		181	158
Premises and equipment transferred to premises held for sale		0	715
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Cash flows from investing activities:
Net change in PPP loans		$ 397	$ 9,036

[1] Outside of the scope of ASC 606.