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Investment Securities - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities
Within one year, amortized cost	$ 0	$ 0
Within one year, estimated fair value	0	0
After one year through five years, amortized cost	1,561	2,769
After one year through five years, estimated fair value	1,697	2,899
After five years through ten years, amortized cost	20,280	21,831
After five years through ten years, estimated fair value	21,088	22,278
After ten years, amortized cost	67,733	55,286
After ten years, estimated fair value	68,326	56,327
Total securities with single maturity date, amortized cost	89,574	79,886
Total securities with single maturity date, estimated fair value	91,111	81,504
Debt securities, amortized cost	466,747	470,162
Available-for-sale investment securities	470,746	463,905
US Treasury Securities [Member]
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	0	0
Investment securities not due at a single maturity date, estimated fair value	0	0
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	14,740	21,723
Investment securities not due at a single maturity date, estimated fair value	14,494	21,321
Debt securities, amortized cost	14,740	21,723
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	198,125	239,388
Investment securities not due at a single maturity date, estimated fair value	196,719	234,930
Debt securities, amortized cost	198,125	239,388
Private label residential mortgage and asset backed securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	155,308	129,165
Investment securities not due at a single maturity date, estimated fair value	159,378	126,150
Debt securities, amortized cost	155,308	129,165
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	9,000	0
Investment securities not due at a single maturity date, estimated fair value	9,044	$ 0
Debt securities, amortized cost	$ 9,000

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