Securities, Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt securities, available-for-sale [Abstract]
Amortized cost	$ 1,778,489		$ 1,778,489		$ 1,694,806
Unrealized gains	63		63		14,497
Unrealized losses	222,051		222,051		21,942
Estimated fair value	1,556,501		1,556,501		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	132,600		132,600		73,016
Unrealized gains	0		0		59
Unrealized losses	11,978		11,978		6
Estimated fair value	120,622		120,622		73,069
Federal Agency [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	248,427		248,427		248,454
Unrealized gains	0		0		0
Unrealized losses	43,637		43,637		8,523
Estimated fair value	204,790		204,790		239,931
State & Municipal [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	98,126		98,126		95,531
Unrealized gains	0		0		116
Unrealized losses	14,311		14,311		1,559
Estimated fair value	83,815		83,815		94,088
Mortgage-Backed, Government Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	469,757		469,757		538,036
Unrealized gains	8		8		8,036
Unrealized losses	60,393		60,393		5,589
Estimated fair value	409,372		409,372		540,483
Mortgage-Backed, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	82,086		82,086		65,339
Unrealized gains	19		19		1,108
Unrealized losses	7,966		7,966		255
Estimated fair value	74,139		74,139		66,192
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	513,088		513,088		484,550
Unrealized gains	35		35		2,723
Unrealized losses	58,833		58,833		5,113
Estimated fair value	454,290		454,290		482,160
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	175,425		175,425		139,380
Unrealized gains	1		1		939
Unrealized losses	19,332		19,332		884
Estimated fair value	156,094		156,094		139,435
Corporate [Member]
Debt securities, available-for-sale [Abstract]
Amortized cost	58,980		58,980		50,500
Unrealized gains	0		0		1,516
Unrealized losses	5,601		5,601		13
Estimated fair value	$ 53,379		$ 53,379		$ 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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