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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Amortized Cost	$ 584	$ 127	$ 268
Due in 1 to 5 years, Securities available for sale, Amortized Cost	26,736	36,534	21,771
Due in 5 to 10 years, Securities available for sale, Amortized Cost	63,422	93,134	102,117
Due after 10 years, Securities available for sale, Amortized Cost	211,771	226,095	194,932
Amortized Cost	302,513	355,890	319,088
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Fair Value (Estimated)	573	127	269
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	27,310	36,778	21,976
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	65,575	95,014	104,238
Due after 10 years, Securities available for sale, Fair Value (Estimated)	218,042	228,601	196,087
Securities available for sale, Fair Value (Estimated)	311,500	360,520	322,570
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in 1 year or less, Securities to be held to maturity, Amortized Cost	1,860	1,334	1,337
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	32,303	25,860	21,857
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	179,877	179,133	186,409
Due after 10 years, Securities to be held to maturity, Amortized Cost	127,922	75,279	92,924
Securities to be held to maturity, Amortized Cost	341,962	281,606	302,527
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated)	1,863	1,338	1,339
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	33,367	26,323	22,026
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	185,994	182,834	189,984
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated)	131,001	76,550	94,726
Securities to be held to maturity, Fair Value (Estimated)	$ 352,225	$ 287,045	$ 308,075

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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X

- Definition

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 next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 320
-Section 50
-Paragraph 3
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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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