Securities, Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt securities, available-for-sale [Abstract]
Amortized cost	$ 1,761,172		$ 1,694,806
Unrealized gains	866		14,497
Unrealized losses	99,341		21,942
Estimated fair value	1,662,697		1,687,361
Allowance for credit losses on AFS securities	0		0
Gross realized gains	0	$ 0
Gross realized losses	0	$ 0
U.S. Treasury [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	122,444		73,016
Unrealized gains	0		59
Unrealized losses	4,809		6
Estimated fair value	117,635		73,069
Federal Agency [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	248,445		248,454
Unrealized gains	0		0
Unrealized losses	22,833		8,523
Estimated fair value	225,612		239,931
State & Municipal [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	95,339		95,531
Unrealized gains	0		116
Unrealized losses	7,037		1,559
Estimated fair value	88,302		94,088
Mortgage-Backed, Government Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	510,500		538,036
Unrealized gains	355		8,036
Unrealized losses	25,782		5,589
Estimated fair value	485,073		540,483
Mortgage-Backed, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	75,846		65,339
Unrealized gains	59		1,108
Unrealized losses	2,581		255
Estimated fair value	73,324		66,192
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	462,288		484,550
Unrealized gains	149		2,723
Unrealized losses	26,908		5,113
Estimated fair value	435,529		482,160
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	190,310		139,380
Unrealized gains	57		939
Unrealized losses	7,897		884
Estimated fair value	182,470		139,435
Corporate [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	56,000		50,500
Unrealized gains	246		1,516
Unrealized losses	1,494		13
Estimated fair value	$ 54,752		$ 52,003

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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