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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, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 567,824	$ 625,605
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	350	392
Gross Unrealized Losses	51,277	45,516
AFS securities	516,897	580,481
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	97,042	122,023
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	350	392
Gross Unrealized Losses	7,619	4,903
AFS securities	89,773	117,512
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	630	858
AFS securities	2,570	2,342
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,927	42,309
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	4,004	3,239
AFS securities	32,923	39,070
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	191,187	218,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	15,557	12,573
AFS securities	175,630	205,728
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	1,331	1,022
AFS securities	6,819	7,128
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	231,318	231,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	22,136	22,921
AFS securities	$ 209,182	$ 208,701

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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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).

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