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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 515,516	$ 559,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9	1,032
Gross Unrealized Loss	26,496	32,858
AFS Securities	489,029	528,148
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	230,807	231,218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Loss	10,236	16,417
AFS Securities	220,571	214,801
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	81,135	94,837
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9	1,032
Gross Unrealized Loss	4,576	2,993
AFS Securities	76,568	92,876
Auction rate securities [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 Loss	156	269
AFS Securities	3,044	2,931
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	29,068	35,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Loss	2,182	2,506
AFS Securities	26,886	32,815
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	163,156	187,248
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Loss	8,482	9,473
AFS Securities	154,674	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 Loss	864	1,200
AFS Securities	$ 7,286	$ 6,950

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- 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).

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