Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale [Abstract]
Amortized cost	$ 1,534,312	$ 1,461,829
Gross unrealized gains	475	11,283
Gross unrealized losses	(132,660)	(17,683)
Fair value	1,402,127	1,455,429
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	457,576	299,606
Gross unrealized gains	210	351
Gross unrealized losses	(27,509)	(4,187)
Fair value	430,277	295,770
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	328,954	334,218
Gross unrealized gains	132	5,524
Gross unrealized losses	(49,860)	(5,539)
Fair value	279,226	334,203
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	654,315	733,467
Gross unrealized gains	133	5,107
Gross unrealized losses	(52,880)	(7,765)
Fair value	601,568	730,809
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	93,467	94,538
Gross unrealized gains	0	301
Gross unrealized losses	(2,411)	(192)
Fair value	$ 91,056	$ 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).

+ References

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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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