Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Total available-for-sale securities, Fair value,	$ 2,722,704	$ 3,151,133
Collateralized Loan Obligations
Assets
Total available-for-sale securities, Fair value,	246,122	241,321
Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	2,722,704	3,151,133
Other assets	14,189	16,321
Liabilities
Other liabilities	(7,080)	(50,119)
Total
Net Assets (Liabilities)	2,729,813	3,117,335
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Other assets	1,287	5,376
Total
Net Assets (Liabilities)	1,287	5,376
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	2,722,704	3,151,133
Other assets	12,902	10,945
Liabilities
Other liabilities	(5,880)	(49,268)
Total
Net Assets (Liabilities)	2,729,726	3,112,810
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Liabilities
Other liabilities	(1,200)	(851)
Total
Net Assets (Liabilities)	(1,200)	(851)
U.S. Treasury and government agency debt securities
Assets
Total available-for-sale securities, Fair value,	114,159	150,982
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	114,159	150,982
U.S. Treasury and government agency debt securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	114,159	150,982
Government-sponsored enterprises debt securities
Assets
Total available-for-sale securities, Fair value,	19,260	44,301
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	19,260	44,301
Government-sponsored enterprises debt securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	19,260	44,301
Residential - Government agency
Assets
Total available-for-sale securities, Fair value,	52,362	59,723
Residential - Government agency | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	52,362	59,723
Residential - Government agency | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	52,362	59,723
Residential - Government-sponsored enterprises
Assets
Total available-for-sale securities, Fair value,	1,005,782	1,160,455
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	1,005,782	1,160,455
Residential - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	1,005,782	1,160,455
Commercial - Government agency
Assets
Total available-for-sale securities, Fair value,	211,897	237,853
Commercial - Government agency | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	211,897	237,853
Commercial - Government agency | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	211,897	237,853
Commercial - Government-sponsored enterprises
Assets
Total available-for-sale securities, Fair value,	84,920	119,573
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	84,920	119,573
Commercial - Government-sponsored enterprises | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	84,920	119,573
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	21,602	21,471
Commercial - Non-government mortgage | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	21,602	21,471
Government agency
Assets
Total available-for-sale securities, Fair value,	565,852	653,322
Government agency | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	565,852	653,322
Government agency | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	565,852	653,322
Government-sponsored enterprises
Assets
Total available-for-sale securities, Fair value,	400,748	462,132
Government-sponsored enterprises | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	400,748	462,132
Government-sponsored enterprises | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	400,748	462,132
Collateralized Loan Obligations | Fair Value, Measurements, Recurring
Assets
Total available-for-sale securities, Fair value,	246,122	241,321
Collateralized Loan Obligations | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total available-for-sale securities, Fair value,	$ 246,122	$ 241,321