Fair Value Measurement of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment securities:
Equity securities	$ 71,513	$ 64,464
Trading debt securities	0	3,973
Available for sale debt securities:
Available for sale debt securities	3,369,724	1,296,576
Loans held for sale	16,931	20,640
Non-recurring fair value measurements:
Unpaid principal balances of loans held for sale	16,800	$ 20,100
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Accrued expenses and other liabilities
U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	291,549	$ 288,157
U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	22,543	23,702
Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	192,509	191,690
Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	2,681,076	626,572
Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	182,047	166,455
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements
Investment securities:
Equity securities	23,642	23,307
Trading debt securities		3,973
Available for sale debt securities:
Available for sale debt securities	291,549	288,157
Loans held for sale	0	0
Other assets	0	0
Total assets	315,191	315,437
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	291,549	288,157
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring fair value measurements
Non-recurring fair value measurements:
Non-performing loan held for sale		0
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-recurring fair value measurements | Nonperforming financial loans
Available for sale debt securities:
Loans held for sale	0
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements
Investment securities:
Equity securities	0	0
Trading debt securities		0
Available for sale debt securities:
Available for sale debt securities	3,078,175	1,008,419
Loans held for sale	16,931	20,640
Other assets	444,263	466,227
Total assets	3,539,369	1,495,286
Liabilities
Other liabilities	454,200	488,103
Total liabilities	454,200	488,103
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	22,543	23,702
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	192,509	191,690
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	2,681,076	626,572
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	182,047	166,455
Significant Other Observable  Inputs (Level 2) | Non-recurring fair value measurements
Non-recurring fair value measurements:
Non-performing loan held for sale		10,000
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	8,750	10,000
Significant Other Observable  Inputs (Level 2) | Non-recurring fair value measurements | Nonperforming financial loans
Available for sale debt securities:
Loans held for sale	8,750
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements
Investment securities:
Equity securities	0	0
Trading debt securities		0
Available for sale debt securities:
Available for sale debt securities	0	0
Loans held for sale	0	0
Other assets	0	0
Total assets	0	0
Liabilities
Other liabilities	0	0
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) | Non-recurring fair value measurements
Non-recurring fair value measurements:
Non-performing loan held for sale		0
Collateral dependent loans	139,424	90,580
Foreclosed assets	13,852	1,444
Total	153,276	92,024
Significant Unobservable Inputs (Level 3) | Non-recurring fair value measurements | Nonperforming financial loans
Available for sale debt securities:
Loans held for sale	0
Fair Value | Recurring fair value measurements
Investment securities:
Trading debt securities		3,973
Available for sale debt securities:
Available for sale debt securities	3,369,724	1,296,576
Loans held for sale	16,931	20,640
Other assets	444,263	466,227
Total assets	3,865,560	1,822,849
Liabilities
Other liabilities	454,200	488,103
Total liabilities	454,200	488,103
Fair Value | Recurring fair value measurements | U.S. Treasury securities
Available for sale debt securities:
Available for sale debt securities	291,549	288,157
Fair Value | Recurring fair value measurements | U.S. government agency securities
Available for sale debt securities:
Available for sale debt securities	22,543	23,702
Fair Value | Recurring fair value measurements | Obligations of states and political subdivisions
Available for sale debt securities:
Available for sale debt securities	192,509	191,690
Fair Value | Recurring fair value measurements | Residential mortgage-backed securities
Available for sale debt securities:
Available for sale debt securities	2,681,076	626,572
Fair Value | Recurring fair value measurements | Corporate and other debt securities
Available for sale debt securities:
Available for sale debt securities	182,047	166,455
Fair Value | Non-recurring fair value measurements
Non-recurring fair value measurements:
Non-performing loan held for sale		10,000
Collateral dependent loans	139,424	90,580
Foreclosed assets	13,852	1,444
Total	162,026	102,024
Fair Value | Non-recurring fair value measurements | Nonperforming financial loans
Available for sale debt securities:
Loans held for sale	8,750
Fair Value | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Recurring fair value measurements
Investment securities:
Equity securities	23,642	23,307
Fair Value | Significant Unobservable Inputs (Level 3)
Investment securities:
Equity securities	36,871	29,031
Fair Value | NAV | Recurring fair value measurements
Investment securities:
Equity securities	$ 11,000	$ 12,126