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Securities - Contractual Maturities of Debt Securities (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less		$ 106,927
Due after one year through five years		105,757
Due after five years through ten years		55,138
Due after ten years		31,024
Debt Securities Available-for-sale, Maturity, Amortized Cost		298,846
Debt Securities, Available-for-Sale, Amortized Cost	[1]	765,374	$ 768,427
Fair Value
Due in one year or less		107,417
Due after one year through five years		111,561
Due after five years through ten years		58,778
Due after ten years		33,429
Debt Securities Available-for-sale, Maturity, Fair Value		311,185
Debt Securities, Available-for-Sale, Fair Value	[1]	801,703	779,133
Collateralized mortgage obligations of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Maturities		172,938
Debt Securities, Available-for-Sale, Amortized Cost		172,938	186,879
Fair Value
Available-for-Sale Debt Securities With Maturities		181,162
Debt Securities, Available-for-Sale, Fair Value		181,162	189,348
Residential mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Maturities		18,891
Debt Securities, Available-for-Sale, Amortized Cost		18,891	22,120
Fair Value
Available-for-Sale Debt Securities With Maturities		19,768
Debt Securities, Available-for-Sale, Fair Value		19,768	22,418
Commercial mortgage-backed securities of U.S. government corporations and agencies
Amortized Cost
Available-for-Sale Debt Securities With Maturities		269,673
Debt Securities, Available-for-Sale, Amortized Cost		269,673	273,771
Fair Value
Available-for-Sale Debt Securities With Maturities		284,550
Debt Securities, Available-for-Sale, Fair Value		284,550	$ 275,870
Corporate Securities
Amortized Cost
Available-for-Sale Debt Securities With Maturities		5,026
Fair Value
Available-for-Sale Debt Securities With Maturities		$ 5,038
[1] Excludes interest receivable of $3.4 million at June 30, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.

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