Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Within one year, amortized cost	$ 0
Within one year, estimated fair value	0
After one year through five years, amortized cost	3,727
After one year through five years, estimated fair value	3,877
After five years through ten years, amortized cost	98,715
After five years through ten years, estimated fair value	92,825
After ten years, amortized cost	346,536
After ten years, estimated fair value	321,685
Total securities with single maturity date, amortized cost	448,978
Total securities with single maturity date, estimated fair value	418,387
Debt securities, amortized cost	1,231,730	$ 1,098,373
Available-for-sale debt securities	1,161,756	1,109,208
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	356
Investment securities not due at a single maturity date, estimated fair value	344
Debt securities, amortized cost	356	373
Available-for-sale debt securities	344	379
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	226,466
Investment securities not due at a single maturity date, estimated fair value	221,304
Debt securities, amortized cost	226,466	213,471
Available-for-sale debt securities	221,304	214,439
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	508,430
Investment securities not due at a single maturity date, estimated fair value	475,813
Debt securities, amortized cost	508,430	317,089
Available-for-sale debt securities	475,813	313,220
Corporate debt securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	47,500
Investment securities not due at a single maturity date, estimated fair value	45,908
Debt securities, amortized cost	47,500	44,500
Available-for-sale debt securities	$ 45,908	$ 44,778

Available-for-sale Securities, Debt Maturities, with Single Maturity Date, Amortized Cost Basis

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Available-for-sale Securities, Debt Maturities, with Single Maturity Date, Fair Value

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