Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Amortized cost	$ 1,390,747	$ 1,430,605
Gross unrealized gains	221	245
Gross unrealized losses	(149,888)	(174,624)
Fair value	1,241,080	1,256,226
U.S. Treasury and Government Agencies [Member]
Available-for-sale [Abstract]
Amortized cost	409,700	418,579
Gross unrealized gains	153	212
Gross unrealized losses	(30,632)	(36,859)
Fair value	379,221	381,932
State and Political Subdivisions [Member]
Available-for-sale [Abstract]
Amortized cost	314,884	326,746
Gross unrealized gains	66	32
Gross unrealized losses	(50,787)	(61,676)
Fair value	264,163	265,102
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	575,723	593,917
Gross unrealized gains	2	1
Gross unrealized losses	(66,640)	(73,833)
Fair value	509,085	520,085
Asset-backed Securities [Member]
Available-for-sale [Abstract]
Amortized cost	90,440	91,363
Gross unrealized gains	0	0
Gross unrealized losses	(1,829)	(2,256)
Fair value	$ 88,611	$ 89,107

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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-Publisher FASB
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