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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 527,774	$ 559,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	66	1,032
Gross Unrealized Losses	21,034	32,858
AFS securities	506,806	528,148
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	230,909	231,218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	10,080	16,417
AFS securities	220,829	214,801
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	85,599	94,837
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	61	1,032
Gross Unrealized Losses	2,761	2,993
AFS securities	82,899	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 Losses	83	269
AFS securities	3,117	2,931
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	30,577	35,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	1,622	2,506
AFS securities	28,955	32,815
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	169,339	187,248
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5	0
Gross Unrealized Losses	5,580	9,473
AFS securities	163,764	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	908	1,200
AFS securities	$ 7,242	$ 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).

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