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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

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Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
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Data Type:	na
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