Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income		$ 82,845	$ 83,804
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		7,050	7,750
Depreciation, amortization and accretion, net		10,410	15,356
Deferred income tax benefit		(2,222)	(883)
Gain on sale of mortgage loans held for sale		(1,868)	(1,251)
Origination of mortgage loans held for sale		(78,742)	(86,100)
Proceeds from sale of mortgage loans held for sale		81,844	83,422
Bank owned life insurance income	[1]	(1,817)	(1,677)
Loss (gain) on the sale of premises and equipment	[1]	39	(75)
Loss on other real estate owned		0	250
Stock compensation expense		2,872	3,219
Excess tax benefit from share-based compensation arrangements		(669)	(579)
Net change in accrued interest receivable and other assets		6,326	(106,238)
Net change in accrued interest payable and other liabilities		17,865	79,409
Net cash provided by operating activities		123,933	76,407
Cash flows from investing activities:
Purchases of available for sale debt securities		0	(6,025)
Proceeds from maturities and paydowns of available for sale debt securities		193,504	106,806
Proceeds from maturities and paydowns of held to maturity debt securities		65,195	28,196
Purchases of FHLB stock		(33,711)	(28,800)
Proceeds from redemption of FHLB stock		20,528	13,487
Net change in loans		(506,484)	(414,908)
Purchases of premises and equipment		(6,570)	(5,536)
Proceeds from sale or disposal of premises and equipment		223	1,732
Other investment activities		(10,547)	(12,339)
Net cash used in investing activities		(277,862)	(317,387)
Cash flows from financing activities:
Net change in deposits		55,325	11,555
Net change in securities sold under agreements to repurchase and federal funds purchased		(9,549)	(16,719)
Proceeds from FHLB advances		2,500,000	2,150,000
Repayments of FHLB advances		(2,375,000)	(1,850,000)
Repurchase of common stock		(3,002)	(2,382)
Cash dividends paid		(26,738)	(25,804)
Net cash provided by financing activities		141,036	266,650
Net change in cash and cash equivalents		(12,893)	25,670
Beginning cash and cash equivalents		265,959	167,367
Ending cash and cash equivalents		253,066	193,037
Supplemental cash flow information:
Interest paid		115,558	64,963
Income taxes paid, net of refunds		13,143	28,460
Cash paid for operating lease liabilities		3,567	3,111
Supplemental non-cash activity:
Change in unfunded commitments in tax credit investments		9,250	100,046
Dividends payable to stockholders		232	212
Premises and equipment transferred to premises held for sale		$ 0	$ 715

[1] (1) Outside of the scope of ASC 606.