Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 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	737,911	$ 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	618,776	617,741
Amortized Cost
Due in less than one year	1,708
Due after one year through five years	14,321
Due after five years through ten years	15,460
Due after ten years	33,975
Available for sale loans with maturity date, amortized cost, total	65,464
Available for sale, amortized cost, total	2,239,127	2,119,303
Fair Value
Due in less than one year	1,684
Due after one year through five years	14,270
Due after five years through ten years	15,377
Due after ten years	32,724
Available for sale loans with maturity date, fair value, total	64,055
Available for sale, fair value, total	2,015,967	1,871,742
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Amortized Cost
Loans without single maturity date	737,911
Held to maturity, amortized cost, total		747,408
Fair Value
Loans without single maturity date	618,776
Held to maturity, fair value, total		617,741
Amortized Cost
Loans without single maturity date	1,657,149
Available for sale, amortized cost, total	1,657,149	1,561,197
Fair Value
Loans without single maturity date	1,454,488
Available for sale, fair value, total	1,454,488	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	175,629
Available for sale, amortized cost, total	175,629	179,148
Fair Value
Loans without single maturity date	163,374
Available for sale, fair value, total	163,374	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	312,086
Available for sale, amortized cost, total	312,086	313,155
Fair Value
Loans without single maturity date	305,477
Available for sale, fair value, total	305,477	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	28,799
Available for sale, amortized cost, total	28,799	22,640
Fair Value
Loans without single maturity date	28,573
Available for sale, fair value, total	$ 28,573	$ 22,410