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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, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 325,966	$ 423,980
Gross Unrealized Gains	13,262	6,687
Gross Unrealized Losses	0	828
AFS securities	339,228	429,839
Debt Securities, Available-for-sale	339,228	429,839
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	137,710	165,005
Amortized Cost	137,710
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5,946	4,747
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	143,656	169,752
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,200	3,200
Amortized Cost	3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	37	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	81
Debt Securities, Available-for-sale	3,237	3,119
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	85,926	139,831
Amortized Cost	85,926
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,726	933
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	560
Debt Securities, Available-for-sale	88,652	140,204
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	97,430	115,944
Amortized Cost	97,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,553	1,007
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	187
Debt Securities, Available-for-sale	101,983	$ 116,764
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,700
Amortized Cost	1,700
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0
Debt Securities, Available-for-sale	$ 1,700

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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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).

+ References

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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

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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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