Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale [Abstract]
Amortized cost	$ 1,486,869	$ 1,461,829
Gross unrealized gains	286	11,283
Gross unrealized losses	(188,563)	(17,683)
Fair value	1,298,592	1,455,429
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	441,216	299,606
Gross unrealized gains	272	351
Gross unrealized losses	(39,716)	(4,187)
Fair value	401,772	295,770
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	326,248	334,218
Gross unrealized gains	12	5,524
Gross unrealized losses	(68,184)	(5,539)
Fair value	258,076	334,203
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	626,731	733,467
Gross unrealized gains	2	5,107
Gross unrealized losses	(77,694)	(7,765)
Fair value	549,039	730,809
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	92,674	94,538
Gross unrealized gains	0	301
Gross unrealized losses	(2,969)	(192)
Fair value	$ 89,705	$ 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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