Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available-for-sale [Abstract]
Amortized cost	$ 1,588,129	$ 1,461,829
Gross unrealized gains	1,868	11,283
Gross unrealized losses	(86,832)	(17,683)
Fair value	1,503,165	1,455,429
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	472,210	299,606
Gross unrealized gains	95	351
Gross unrealized losses	(20,574)	(4,187)
Fair value	451,731	295,770
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	331,756	334,218
Gross unrealized gains	823	5,524
Gross unrealized losses	(29,917)	(5,539)
Fair value	302,662	334,203
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	690,098	733,467
Gross unrealized gains	895	5,107
Gross unrealized losses	(35,780)	(7,765)
Fair value	655,213	730,809
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	94,065	94,538
Gross unrealized gains	55	301
Gross unrealized losses	(561)	(192)
Fair value	$ 93,559	$ 94,647

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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Amount, before tax, of unrealized loss 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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