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Investment Securities - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Within one year, amortized cost	$ 298	$ 0
Within one year, estimated fair value	305	0
After one year through five years, amortized cost	3,254	1,561
After one year through five years, estimated fair value	3,631	1,697
After five years through ten years, amortized cost	18,330	20,280
After five years through ten years, estimated fair value	20,644	21,088
After ten years, amortized cost	339,852	67,733
After ten years, estimated fair value	354,985	68,326
Total securities with single maturity date, amortized cost	361,734	89,574
Total securities with single maturity date, estimated fair value	379,565	91,111
Debt securities, amortized cost	689,001	466,747
Available-for-sale investment securities	710,092	470,746
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	651	14,740
Investment securities not due at a single maturity date, estimated fair value	680	14,494
Debt securities, amortized cost	651	14,740
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	214,203	198,125
Investment securities not due at a single maturity date, estimated fair value	216,298	196,719
Debt securities, amortized cost	214,203	198,125
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	82,413	155,308
Investment securities not due at a single maturity date, estimated fair value	83,508	159,378
Debt securities, amortized cost	82,413	155,308
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	30,000	9,000
Investment securities not due at a single maturity date, estimated fair value	30,041	9,044
Debt securities, amortized cost	$ 30,000	$ 9,000

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