Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in less than one year	$ 0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Held to maturity loans with maturity date, amortized cost, total	0
Held to maturity, amortized cost, total	707,812	$ 747,408
Fair Value
Due in less than one year	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Held to maturity loans with maturity date, fair value, total	0
Held to maturity, fair value, total	577,586	617,741
Amortized Cost
Due in less than one year	4,903
Due after one year through five years	11,125
Due after five years through ten years	14,256
Due after ten years	32,955
Available for sale loans with maturity date, amortized cost, total	63,239
Available for sale, amortized cost, total	2,168,686	2,119,303
Fair Value
Due in less than one year	4,811
Due after one year through five years	11,002
Due after five years through ten years	14,129
Due after ten years	31,484
Available for sale loans with maturity date, fair value, total	61,426
Available for sale, fair value, total	1,916,231	1,871,742
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Amortized Cost
Loans without single maturity date	707,812
Held to maturity, amortized cost, total		747,408
Fair Value
Loans without single maturity date	577,586
Held to maturity, fair value, total		617,741
Amortized Cost
Loans without single maturity date	1,623,932
Available for sale, amortized cost, total	1,623,932	1,561,197
Fair Value
Loans without single maturity date	1,393,543
Available for sale, fair value, total	1,393,543	1,338,653
Private mortgage-backed securities and collateralized mortgage obligations
Amortized Cost
Loans without single maturity date	0
Fair Value
Loans without single maturity date	0
Amortized Cost
Loans without single maturity date	143,008
Available for sale, amortized cost, total	143,008	179,148
Fair Value
Loans without single maturity date	129,671
Available for sale, fair value, total	129,671	166,387
Collateralized loan obligations
Amortized Cost
Loans without single maturity date	0
Fair Value
Loans without single maturity date	0
Amortized Cost
Loans without single maturity date	310,516
Available for sale, amortized cost, total	310,516	313,155
Fair Value
Loans without single maturity date	303,312
Available for sale, fair value, total	303,312	302,904
Other debt securities
Amortized Cost
Loans without single maturity date	0
Fair Value
Loans without single maturity date	0
Amortized Cost
Loans without single maturity date	27,991
Available for sale, amortized cost, total	27,991	22,640
Fair Value
Loans without single maturity date	28,279
Available for sale, fair value, total	$ 28,279	$ 22,410