Investment Securities (Held-to-maturity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $40,682 at March 31, 2020 and $32,541 at December 31, 2019) (a)(b)	$ 38,738		$ 31,747
Debt Securities, Held-to-maturity, Allowance for Credit Loss	6	$ 7
Gross Unrealized Gains	1,944		889
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0		95
Debt Securities, Held-to-maturity, Fair Value	40,682		32,541
Amortized Cost	38,744		31,747
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(6)
Gross Unrealized Gains	504		445
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0		0
Debt Securities, Held-to-maturity, Fair Value	4,342		4,791
Amortized Cost	3,844
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	1,020		169
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0		94
Debt Securities, Held-to-maturity, Fair Value	30,090		21,569
Amortized Cost	29,070
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	420		275
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0		1
Debt Securities, Held-to-maturity, Fair Value	6,250		6,181
Amortized Cost	5,830
Reported Value Measurement [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $40,682 at March 31, 2020 and $32,541 at December 31, 2019) (a)(b)	38,744		31,747
Reported Value Measurement [Member] \| States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $40,682 at March 31, 2020 and $32,541 at December 31, 2019) (a)(b)	3,844		4,346
Reported Value Measurement [Member] \| Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $40,682 at March 31, 2020 and $32,541 at December 31, 2019) (a)(b)	29,070		21,494
Reported Value Measurement [Member] \| Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $40,682 at March 31, 2020 and $32,541 at December 31, 2019) (a)(b)	$ 5,830		$ 5,907

Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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