v3.26.1
Derivative Instruments - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
derivativeInstrument
contract
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
derivativeInstrument
contract
Jun. 30, 2025
USD ($)
Dec. 31, 2019
USD ($)
derivativeInstrument
Dec. 31, 2025
USD ($)
contract
derivativeInstrument
Derivatives, Fair Value [Line Items]            
Number of contracts | contract 344   344     319
Derivative, notional amount $ 3,355,842,000   $ 3,355,842,000     $ 3,291,329,000
Cash pledged as collateral, obligation to repay $ 7,900,000   $ 7,900,000     $ 5,300,000
Customer Derivatives not designated as hedging instruments            
Derivatives, Fair Value [Line Items]            
Number of contracts | contract 336   336     313
Derivative, notional amount $ 3,041,664,000   $ 3,041,664,000     $ 3,177,151,000
Interest rate swaps: | Derivatives designated as hedging instruments            
Derivatives, Fair Value [Line Items]            
Number of contracts | contract 8   8     6
Derivative, notional amount $ 314,178,000   $ 314,178,000     $ 114,178,000
Securities pledged 1,300,000   1,300,000     $ 11,000,000.0
Interest rate swaps: | Derivatives designated as hedging instruments | Federal Home Loan Bank Advances            
Derivatives, Fair Value [Line Items]            
Number of instruments terminated | derivativeInstrument         16  
Gain on termination of cash flow hedge     200,000   $ 8,900,000  
Reduction of interest expense on FHLB advances $ 200,000 $ 200,000 $ 400,000 $ 400,000    
Interest rate swaps: | Derivatives designated as hedging instruments | Federal Home Loan Bank Advances | Minimum            
Derivatives, Fair Value [Line Items]            
Average remaining maturity         1 month  
Interest rate swaps: | Derivatives designated as hedging instruments | Federal Home Loan Bank Advances | Maximum            
Derivatives, Fair Value [Line Items]            
Average remaining maturity         7 years  
Interest rate swaps: | Derivatives designated as hedging instruments | Junior subordinated debentures            
Derivatives, Fair Value [Line Items]            
Number of contracts | derivativeInstrument 5   5     5
Derivative, notional amount $ 64,200,000   $ 64,200,000     $ 64,200,000
Derivative, amount of hedged item 64,200,000   64,200,000     $ 64,200,000
Unrealized gain (loss) on derivatives $ 100,000 $ 100,000 $ 200,000 $ 100,000    
Interest rate swaps: | Derivatives designated as hedging instruments | Loans            
Derivatives, Fair Value [Line Items]            
Number of contracts | derivativeInstrument           1
Derivative, notional amount           $ 50,000,000.0
Interest rate swaps: | Derivatives designated as hedging instruments | Loans | With Maturities In Second Quarter of 2027, 2028 and 2029            
Derivatives, Fair Value [Line Items]            
Number of contracts | derivativeInstrument 3   3      
Derivative, notional amount $ 250,000,000.0   $ 250,000,000.0      
Interest rate swaps: | Derivatives designated as hedging instruments | Loans | Interest Rate Risk Management Strategy            
Derivatives, Fair Value [Line Items]            
Number of contracts | derivativeInstrument 2   2      
Derivative, notional amount $ 200,000,000.0   $ 200,000,000.0      
Interest rate swaps: | Customer Derivatives not designated as hedging instruments            
Derivatives, Fair Value [Line Items]            
Number of contracts | contract 276   276     290
Derivative, notional amount $ 2,694,210,000   $ 2,694,210,000     $ 2,876,834,000
Interest rate swaps: | Customer Derivatives not designated as hedging instruments | Third party broker            
Derivatives, Fair Value [Line Items]            
Number of contracts | contract 138   138     145
Derivative, notional amount $ 1,347,105,000   $ 1,347,105,000     $ 1,438,417,000
Securities pledged 0   0     0
Variable Interest Rate | Derivatives designated as hedging instruments | Loans            
Derivatives, Fair Value [Line Items]            
Derivative, notional amount $ 250,000,000.0   $ 250,000,000.0     $ 50,000,000