Investment Securities (Held-to-maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $179,887 at June 30, 2021 and $68,082 at December 31, 2020) (a)	$ 180,224	$ 66,458
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(201)	(60)
Gross Unrealized Gains	2,178	1,789
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	2,515	165
Debt Securities, Held-to-maturity, Fair Value	179,887	68,082
Amortized Cost	180,425	66,518
Debt securities, maturing 5 to 10 years, amortized cost	6,194
States and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $179,887 at June 30, 2021 and $68,082 at December 31, 2020) (a)	102,425	35,199
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(201)	(60)
Gross Unrealized Gains	1,079	510
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	1,563	165
Debt Securities, Held-to-maturity, Fair Value	101,740	35,484
Amortized Cost	102,425
Debt securities, maturing 5 to 10 years, amortized cost	2,511
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	676	852
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	24,743	26,742
Amortized Cost	24,067
Debt securities, maturing 5 to 10 years, amortized cost	0
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	324	427
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	195	0
Debt Securities, Held-to-maturity, Fair Value	23,959	5,856
Amortized Cost	23,830
Debt securities, maturing 5 to 10 years, amortized cost	3,683
Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Gross Unrealized Gains	99
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	757
Debt Securities, Held-to-maturity, Fair Value	29,445
Amortized Cost	30,103
Debt securities, maturing 5 to 10 years, amortized cost	0
Reported Value Measurement [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $179,887 at June 30, 2021 and $68,082 at December 31, 2020) (a)	180,224	66,458
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 $179,887 at June 30, 2021 and $68,082 at December 31, 2020) (a)	102,224	35,139
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 $179,887 at June 30, 2021 and $68,082 at December 31, 2020) (a)	24,067	25,890
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 $179,887 at June 30, 2021 and $68,082 at December 31, 2020) (a)	23,830	5,429
Reported Value Measurement [Member] \| Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity investment securities, at amortized cost (fair value of $179,887 at June 30, 2021 and $68,082 at December 31, 2020) (a)	$ 30,103	$ 0

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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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 of accumulated unrealized loss 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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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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