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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, 2025
Dec. 31, 2024
Investment securities:    
Equity securities $ 82,774 $ 71,513
Available for sale debt securities:    
Available for sale debt securities 4,202,218 3,369,724
Loans held for sale 8,212 15,681
Non-recurring fair value measurements:    
Unpaid principal balances of loans held for sale 8,100 16,800
Specific valuation allowance allocations 82,000 75,800
U.S. Treasury securities    
Available for sale debt securities:    
Available for sale debt securities 228,487 291,549
U.S. government agency securities    
Available for sale debt securities:    
Available for sale debt securities 39,944 22,543
Obligations of states and political subdivisions    
Available for sale debt securities:    
Available for sale debt securities 193,380 192,509
Residential mortgage-backed securities    
Available for sale debt securities:    
Available for sale debt securities 3,514,078 2,681,076
Corporate and other debt securities    
Available for sale debt securities:    
Available for sale debt securities 226,329 182,047
Recurring fair value measurements    
Available for sale debt securities:    
Available for sale debt securities 4,202,218 3,369,724
Loans held for sale 8,212 16,931
Other assets 182,673 444,263
Total assets 4,426,506 3,865,560
Liabilities    
Other liabilities 184,162 454,200
Total liabilities 184,162 454,200
Recurring fair value measurements | U.S. Treasury securities    
Available for sale debt securities:    
Available for sale debt securities 228,487 291,549
Recurring fair value measurements | U.S. government agency securities    
Available for sale debt securities:    
Available for sale debt securities 39,944 22,543
Recurring fair value measurements | Obligations of states and political subdivisions    
Available for sale debt securities:    
Available for sale debt securities 193,380 192,509
Recurring fair value measurements | Residential mortgage-backed securities    
Available for sale debt securities:    
Available for sale debt securities 3,514,078 2,681,076
Recurring fair value measurements | Corporate and other debt securities    
Available for sale debt securities:    
Available for sale debt securities 226,329 182,047
Non-recurring fair value measurements    
Non-recurring fair value measurements:    
Non-performing loans held for sale   8,750
Collateral dependent loans 105,107 139,424
Foreclosed assets 5,680 13,852
Total 110,787 162,026
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Recurring fair value measurements    
Investment securities:    
Equity securities 23,293 23,642
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements    
Investment securities:    
Equity securities 23,293 23,642
Available for sale debt securities:    
Available for sale debt securities 228,487 291,549
Loans held for sale 0 0
Other assets 0 0
Total assets 251,780 315,191
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 228,487 291,549
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 loans held for sale   0
Collateral dependent loans 0 0
Foreclosed assets 0 0
Total 0 0
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements    
Investment securities:    
Equity securities 0 0
Available for sale debt securities:    
Available for sale debt securities 3,973,731 3,078,175
Loans held for sale 8,212 16,931
Other assets 182,673 444,263
Total assets 4,164,616 3,539,369
Liabilities    
Other liabilities 184,162 454,200
Total liabilities 184,162 454,200
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 39,944 22,543
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 193,380 192,509
Significant Other Observable  Inputs (Level 2) | Recurring fair value measurements | Residential mortgage-backed securities    
Available for sale debt securities:    
Available for sale debt securities 3,514,078 2,681,076
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 226,329 182,047
Significant Other Observable  Inputs (Level 2) | Non-recurring fair value measurements    
Non-recurring fair value measurements:    
Non-performing loans held for sale   8,750
Collateral dependent loans 0 0
Foreclosed assets 0 0
Total 0 8,750
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements    
Investment securities:    
Equity securities 0 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 loans held for sale   0
Collateral dependent loans 105,107 139,424
Foreclosed assets 5,680 13,852
Total 110,787 153,276
NAV | Recurring fair value measurements    
Investment securities:    
Equity securities $ 10,110 $ 11,000