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Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 0
Due after one year through five years	0
Due after five years through ten years	5,161
Due after ten years	6,514
Held to maturity, amortized cost	11,675
Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	4,833
Due after ten years	6,123
Held to maturity, fair value	10,956	$ 10,848
Amortized Cost
Due in one year or less	48,761
Due after one year through five years	86,572
Due after five years through ten years	177,058
Due after ten years	167,031
Available for sale, amortized cost	1,349,979	1,407,675
Fair Value
Due in one year or less	48,562
Due after one year through five years	79,665
Due after five years through ten years	156,673
Due after ten years	138,382
Available for sale, fair value	1,190,922	1,253,631
Commercial mortgage-backed securities
Amortized Cost
Without single maturity date	0
Fair Value
Without single maturity date	0
Amortized Cost
Without single maturity date	104,150
Available for sale, amortized cost	104,150	104,459
Fair Value
Without single maturity date	92,740
Available for sale, fair value	92,740	93,396
Residential mortgage-backed securities
Amortized Cost
Without single maturity date	0
Fair Value
Without single maturity date	0
Amortized Cost
Without single maturity date	552,647
Available for sale, amortized cost	552,647	569,622
Fair Value
Without single maturity date	486,623
Available for sale, fair value	486,623	506,502
Commercial collateralized mortgage obligations
Amortized Cost
Without single maturity date	0
Fair Value
Without single maturity date	0
Amortized Cost
Without single maturity date	45,874
Available for sale, amortized cost	45,874	39,386
Fair Value
Without single maturity date	41,426
Available for sale, fair value	41,426	35,183
Residential collateralized mortgage obligations
Amortized Cost
Without single maturity date	0
Fair Value
Without single maturity date	0
Amortized Cost
Without single maturity date	147,310
Available for sale, amortized cost	147,310	150,710
Fair Value
Without single maturity date	126,333
Available for sale, fair value	126,333	130,144
Asset-backed securities
Amortized Cost
Without single maturity date	0
Fair Value
Without single maturity date	0
Amortized Cost
Without single maturity date	20,576
Available for sale, amortized cost	20,576	43,521
Fair Value
Without single maturity date	20,518
Available for sale, fair value	$ 20,518	$ 43,005

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