Fair Value Measurements - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets
Equity securities, at fair value	$ 778	$ 777
Recurring \| Level 1
Assets
Available-for-sale securities	0	0
Derivatives designated as hedging instruments	0
Liabilities
Derivatives not designated as hedging instruments	0	0
Recurring \| Level 2
Assets
Available-for-sale securities	1,468,003	1,594,967
Derivatives designated as hedging instruments	3,420
Liabilities
Derivatives not designated as hedging instruments	18	21
Recurring \| Level 3
Assets
Available-for-sale securities	0	0
Derivatives designated as hedging instruments	0
Liabilities
Derivatives not designated as hedging instruments	0	0
Recurring \| U.S. Treasuries \| Level 1
Assets
Available-for-sale securities	0	0
Recurring \| U.S. Treasuries \| Level 2
Assets
Available-for-sale securities	168,094	167,251
Recurring \| U.S. Treasuries \| Level 3
Assets
Available-for-sale securities	0	0
Recurring \| Obligations of U.S. Government sponsored entities \| Level 1
Assets
Available-for-sale securities	0	0
Recurring \| Obligations of U.S. Government sponsored entities \| Level 2
Assets
Available-for-sale securities	523,543	601,167
Recurring \| Obligations of U.S. Government sponsored entities \| Level 3
Assets
Available-for-sale securities	0	0
Recurring \| Obligations of U.S. states and political subdivisions \| Level 1
Assets
Available-for-sale securities	0	0
Recurring \| Obligations of U.S. states and political subdivisions \| Level 2
Assets
Available-for-sale securities	82,047	85,281
Recurring \| Obligations of U.S. states and political subdivisions \| Level 3
Assets
Available-for-sale securities	0	0
Recurring \| U.S. Government agencies \| Level 1
Assets
Available-for-sale securities	0	0
Recurring \| U.S. Government agencies \| Level 2
Assets
Available-for-sale securities	48,942	52,668
Recurring \| U.S. Government agencies \| Level 3
Assets
Available-for-sale securities	0	0
Recurring \| U.S. Government sponsored entities \| Level 1
Assets
Available-for-sale securities	0	0
Recurring \| U.S. Government sponsored entities \| Level 2
Assets
Available-for-sale securities	643,135	686,222
Recurring \| U.S. Government sponsored entities \| Level 3
Assets
Available-for-sale securities	0	0
Recurring \| U.S. corporate debt securities \| Level 1
Assets
Available-for-sale securities	0	0
Recurring \| U.S. corporate debt securities \| Level 2
Assets
Available-for-sale securities	2,242	2,378
Recurring \| U.S. corporate debt securities \| Level 3
Assets
Available-for-sale securities	0	0
Recurring \| Equity securities \| Level 1
Assets
Equity securities, at fair value	0	0
Recurring \| Equity securities \| Level 2
Assets
Equity securities, at fair value	0	0
Recurring \| Equity securities \| Level 3
Assets
Equity securities, at fair value	778	777
Recurring \| Fair Value
Assets
Available-for-sale securities	1,468,003	1,594,967
Derivatives designated as hedging instruments	3,420
Liabilities
Derivatives not designated as hedging instruments	18	21
Recurring \| Fair Value \| U.S. Treasuries
Assets
Available-for-sale securities	168,094	167,251
Recurring \| Fair Value \| Obligations of U.S. Government sponsored entities
Assets
Available-for-sale securities	523,543	601,167
Recurring \| Fair Value \| Obligations of U.S. states and political subdivisions
Assets
Available-for-sale securities	82,047	85,281
Recurring \| Fair Value \| U.S. Government agencies
Assets
Available-for-sale securities	48,942	52,668
Recurring \| Fair Value \| U.S. Government sponsored entities
Assets
Available-for-sale securities	643,135	686,222
Recurring \| Fair Value \| U.S. corporate debt securities
Assets
Available-for-sale securities	2,242	2,378
Recurring \| Fair Value \| Equity securities
Assets
Equity securities, at fair value	$ 778	$ 777