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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 552,337	$ 559,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	805	1,032
Gross Unrealized Losses	35,557	32,858
AFS securities	517,585	528,148
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	231,114	231,218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	16,888	16,417
AFS securities	214,226	214,801
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	93,569	94,837
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	805	1,032
Gross Unrealized Losses	3,904	2,993
AFS securities	90,470	92,876
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,200	3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	187	269
AFS securities	3,013	2,931
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	33,762	35,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	2,718	2,506
AFS securities	31,044	32,815
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	182,542	187,248
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	10,711	9,473
AFS securities	171,831	177,775
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,150	8,150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	1,149	1,200
AFS securities	$ 7,001	$ 6,950

X

- Definition

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).

+ References

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-Section 50
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-Publisher FASB
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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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