v3.26.1
Fair Value Measurements (Schedule of Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value $ 3,240,067 $ 3,164,756
Equity securities 19,893 19,875
Derivative assets 103,995 105,260
Derivative liabilities 104,998 106,445
Foreclosed assets 2,015 2,015
Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 267,360 266,744
Equity securities 19,893 19,875
Derivative assets 0 0
Derivative liabilities 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 2,972,707 2,898,012
Equity securities 0 0
Derivative assets 105,653 105,734
Derivative liabilities 104,613 108,102
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Equity securities 0 0
Derivative assets 0 0
Derivative liabilities 0 0
U.S. Treasury obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 267,360 266,744
U.S. Treasury obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 267,360 266,744
U.S. Treasury obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
U.S. Treasury obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Government-agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 30,644 33,539
Government-agency obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Government-agency obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 30,644 33,539
Government-agency obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 2,690,053 2,612,347
Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Mortgage-backed securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 2,690,053 2,612,347
Mortgage-backed securities | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,324 41,761
Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Asset-backed securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,324 41,761
Asset-backed securities | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
State and municipal obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 111,692 112,999
State and municipal obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
State and municipal obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 111,692 112,999
State and municipal obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 99,994 97,366
Corporate obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Corporate obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 99,994 97,366
Corporate obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 3,240,067 3,164,756
Equity securities 19,893 19,875
Derivative assets 105,653 105,734
Assets, fair value 3,365,613 3,290,365
Derivative liabilities 104,613 108,102
Measured on a recurring basis: | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 267,360 266,744
Equity securities 19,893 19,875
Derivative assets 0 0
Assets, fair value 287,253 286,619
Derivative liabilities 0 0
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 2,972,707 2,898,012
Equity securities 0 0
Derivative assets 105,653 105,734
Assets, fair value 3,078,360 3,003,746
Derivative liabilities 104,613 108,102
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Equity securities 0 0
Derivative assets 0 0
Assets, fair value 0 0
Derivative liabilities 0 0
Measured on a recurring basis: | U.S. Treasury obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 267,360 266,744
Measured on a recurring basis: | U.S. Treasury obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 267,360 266,744
Measured on a recurring basis: | U.S. Treasury obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | U.S. Treasury obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Government-agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 30,644 33,539
Measured on a recurring basis: | Government-agency obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Government-agency obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 30,644 33,539
Measured on a recurring basis: | Government-agency obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 2,690,053 2,612,347
Measured on a recurring basis: | Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Mortgage-backed securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 2,690,053 2,612,347
Measured on a recurring basis: | Mortgage-backed securities | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,324 41,761
Measured on a recurring basis: | Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Asset-backed securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,324 41,761
Measured on a recurring basis: | Asset-backed securities | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | State and municipal obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 111,692 112,999
Measured on a recurring basis: | State and municipal obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | State and municipal obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 111,692 112,999
Measured on a recurring basis: | State and municipal obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 99,994 97,366
Measured on a recurring basis: | Corporate obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Measured on a recurring basis: | Corporate obligations | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 99,994 97,366
Measured on a recurring basis: | Corporate obligations | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Available for sale debt securities:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, fair value 125,980 56,521
Loans measured for impairment based on the fair value of the underlying collateral 123,965 54,506
Foreclosed assets 2,015 2,015
Available for sale debt securities: | Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, fair value 0 0
Loans measured for impairment based on the fair value of the underlying collateral 0 0
Foreclosed assets 0 0
Available for sale debt securities: | Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, fair value 0 0
Loans measured for impairment based on the fair value of the underlying collateral 0 0
Foreclosed assets 0 0
Available for sale debt securities: | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, fair value 125,980 56,521
Loans measured for impairment based on the fair value of the underlying collateral 123,965 54,506
Foreclosed assets $ 2,015 $ 2,015