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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, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 562,956	$ 485,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,742	7,832
Gross Unrealized Losses	19,779	2,941
AFS securities	544,919	490,601
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	114,112	116,836
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,595	4,457
Gross Unrealized Losses	1,692	88
AFS securities	114,015	121,205
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	42
Gross Unrealized Losses	333	0
AFS securities	2,867	3,242
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50,775	54,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9	1,438
Gross Unrealized Losses	1,206	0
AFS securities	49,578	56,148
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	154,794	90,435
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	138	1,876
Gross Unrealized Losses	2,491	10
AFS securities	152,441	92,301
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	19
Gross Unrealized Losses	400	167
AFS securities	7,750	8,002
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	231,925	212,379
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Gross Unrealized Losses	13,657	2,676
AFS securities	$ 218,268	$ 209,703

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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-SubTopic 10
-Section 50
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount 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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