Securities, Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt securities, available-for-sale [Abstract]
Amortized cost	$ 1,762,691		$ 1,762,691		$ 1,694,806
Unrealized gains	185		185		14,497
Unrealized losses	143,520		143,520		21,942
Estimated fair value	1,619,356		1,619,356		1,687,361
Allowance for credit losses on AFS securities	0		0		0
Gross realized gains	0	$ 0	0	$ 0
Gross realized losses	0	$ 0	0	$ 0
U.S. Treasury [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	122,569		122,569		73,016
Unrealized gains	0		0		59
Unrealized losses	7,392		7,392		6
Estimated fair value	115,177		115,177		73,069
Federal Agency [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	248,436		248,436		248,454
Unrealized gains	0		0		0
Unrealized losses	31,004		31,004		8,523
Estimated fair value	217,432		217,432		239,931
State & Municipal [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	98,322		98,322		95,531
Unrealized gains	10		10		116
Unrealized losses	10,373		10,373		1,559
Estimated fair value	87,959		87,959		94,088
Mortgage-Backed, Government Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	488,032		488,032		538,036
Unrealized gains	43		43		8,036
Unrealized losses	37,701		37,701		5,589
Estimated fair value	450,374		450,374		540,483
Mortgage-Backed, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	75,747		75,747		65,339
Unrealized gains	42		42		1,108
Unrealized losses	4,118		4,118		255
Estimated fair value	71,671		71,671		66,192
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	495,186		495,186		484,550
Unrealized gains	73		73		2,723
Unrealized losses	36,802		36,802		5,113
Estimated fair value	458,457		458,457		482,160
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	178,399		178,399		139,380
Unrealized gains	17		17		939
Unrealized losses	13,310		13,310		884
Estimated fair value	165,106		165,106		139,435
Corporate [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	56,000		56,000		50,500
Unrealized gains	0		0		1,516
Unrealized losses	2,820		2,820		13
Estimated fair value	$ 53,180		$ 53,180		$ 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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Amortized cost of 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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Amount of 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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