Investment Securities - Amortized Cost of Investment Securities Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,287,372	$ 2,180,047
Aaa
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	171,659
Aa1
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	162,728
Aa2
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	185,394
Aa3
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	135,227
A1
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	131,417
A2
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,168
A3
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,117
Non-rated
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,480,662
State and municipal
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,117,552	$ 1,057,301
State and municipal | Aaa
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	101,076
State and municipal | Aa1
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	162,728
State and municipal | Aa2
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	185,394
State and municipal | Aa3
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	135,227
State and municipal | A1
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	131,417
State and municipal | A2
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,168
State and municipal | A3
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,117
State and municipal | Non-rated
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	381,425
Other
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,169,820
Other | Aaa
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	70,583
Other | Aa1
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0
Other | Aa2
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0
Other | Aa3
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0
Other | A1
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0
Other | A2
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0
Other | A3
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0
Other | Non-rated
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,099,237