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Fair Value Measurements (Financial Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Financial assets:        
Cash and cash equivalents $ 208,802 $ 186,438 $ 277,462 $ 685,163
Available for sale debt securities, at fair value 1,749,889 1,803,548    
Investment securities held to maturity, fair value 365,029 373,468    
Federal Home Loan Bank stock 93,330 68,554    
Equity securities 1,238 1,147    
Loans, net of allowance for credit losses 10,428,458 10,160,860    
Derivative assets 134,405 151,192    
Financial liabilities:        
Certificates of deposit 1,020,329 751,436    
Total deposits 10,261,120 10,563,024    
Borrowed funds 1,849,714 1,337,370    
Subordinated debentures 10,596 10,493    
Derivative liability 109,882 122,390    
Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Cash and cash equivalents 208,872 186,508    
Available for sale debt securities, at fair value 278,820 245,816    
Investment securities held to maturity, fair value 11,167 8,964    
Federal Home Loan Bank stock 93,330 68,554    
Equity securities 1,238 1,147    
Loans, net of allowance for credit losses 0 0    
Derivative assets 0 0    
Financial liabilities:        
Deposits other than certificates of deposits 9,240,791 9,811,588    
Certificates of deposit 0 0    
Total deposits 9,240,791 9,811,588    
Borrowed funds 0 0    
Subordinated debentures 0 0    
Derivative liability 0 0    
Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Cash and cash equivalents 0 0    
Available for sale debt securities, at fair value 1,471,069 1,557,732    
Investment securities held to maturity, fair value 353,862 364,504    
Federal Home Loan Bank stock 0 0    
Equity securities 0 0    
Loans, net of allowance for credit losses 0 0    
Derivative assets 131,191 148,151    
Financial liabilities:        
Deposits other than certificates of deposits 0 0    
Certificates of deposit 1,015,211 745,155    
Total deposits 1,015,211 745,155    
Borrowed funds 1,832,814 1,324,578    
Subordinated debentures 9,118 9,422    
Derivative liability 108,067 120,896    
Significant Unobservable Inputs (Level 3)        
Financial assets:        
Cash and cash equivalents 0 0    
Available for sale debt securities, at fair value 0 0    
Investment securities held to maturity, fair value 0 0    
Federal Home Loan Bank stock 0 0    
Equity securities 0 0    
Loans, net of allowance for credit losses 9,969,672 9,768,460    
Derivative assets 0 0    
Financial liabilities:        
Deposits other than certificates of deposits 0 0    
Certificates of deposit 0 0    
Total deposits 0 0    
Borrowed funds 0 0    
Subordinated debentures 0 0    
Derivative liability 0 0    
U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 247,067 245,816    
U.S. Treasury obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Available for sale debt securities, at fair value 247,067 245,816    
U.S. Treasury obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
U.S. Treasury obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 31,753      
Investment securities held to maturity, fair value 11,167 8,964    
Agency obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Available for sale debt securities, at fair value 31,753      
Investment securities held to maturity, fair value 11,167 8,964    
Agency obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 0      
Investment securities held to maturity, fair value 0 0    
Agency obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Available for sale debt securities, at fair value 0      
Investment securities held to maturity, fair value 0 0    
Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 1,346,724 1,427,139    
Mortgage-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Mortgage-backed securities | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 1,346,724 1,427,139    
Mortgage-backed securities | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 34,506 37,621    
Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Asset-backed securities | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 34,506 37,621    
Asset-backed securities | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 55,725 56,864    
Investment securities held to maturity, fair value 344,661 353,417    
State and municipal obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Investment securities held to maturity, fair value 0 0    
State and municipal obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 55,725 56,864    
Investment securities held to maturity, fair value 344,661 353,417    
State and municipal obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Investment securities held to maturity, fair value 0 0    
Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 34,114 36,108    
Investment securities held to maturity, fair value 9,201 11,087    
Corporate obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Investment securities held to maturity, fair value 0 0    
Corporate obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 34,114 36,108    
Investment securities held to maturity, fair value 9,201 11,087    
Corporate obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Investment securities held to maturity, fair value 0 0    
Carrying Value        
Financial assets:        
Cash and cash equivalents 208,872 186,508    
Available for sale debt securities, at fair value 1,749,889 1,803,548    
Investment securities held to maturity, fair value 378,894 387,923    
Federal Home Loan Bank stock 93,330 68,554    
Equity securities 1,238 1,147    
Loans, net of allowance for credit losses 10,428,458 10,160,860    
Derivative assets 131,191 148,151    
Financial liabilities:        
Deposits other than certificates of deposits 9,240,791 9,811,588    
Certificates of deposit 1,020,329 751,436    
Total deposits 10,261,120 10,563,024    
Borrowed funds 1,849,714 1,337,370    
Subordinated debentures 10,596 10,493    
Derivative liability 108,067 120,896    
Carrying Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 247,067 245,816    
Carrying Value | Agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 31,753      
Investment securities held to maturity, fair value 12,096 9,997    
Carrying Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 1,346,724 1,427,139    
Carrying Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 34,506 37,621    
Carrying Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 55,725 56,864    
Investment securities held to maturity, fair value 356,987 366,146    
Carrying Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 34,114 36,108    
Investment securities held to maturity, fair value 9,811 11,780    
Fair Value        
Financial assets:        
Cash and cash equivalents 208,872 186,508    
Available for sale debt securities, at fair value 1,749,889 1,803,548    
Investment securities held to maturity, fair value 365,029 373,468    
Federal Home Loan Bank stock 93,330 68,554    
Equity securities 1,238 1,147    
Loans, net of allowance for credit losses 9,969,672 9,768,460    
Derivative assets 131,191 148,151    
Financial liabilities:        
Deposits other than certificates of deposits 9,240,791 9,811,588    
Certificates of deposit 1,015,211 745,155    
Total deposits 10,256,002 10,556,743    
Borrowed funds 1,832,814 1,324,578    
Subordinated debentures 9,118 9,422    
Derivative liability 108,067 120,896    
Fair Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 247,067 245,816    
Fair Value | Agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 31,753      
Investment securities held to maturity, fair value 11,167 8,964    
Fair Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 1,346,724 1,427,139    
Fair Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 34,506 37,621    
Fair Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 55,725 56,864    
Investment securities held to maturity, fair value 344,661 353,417    
Fair Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 34,114 36,108    
Investment securities held to maturity, fair value $ 9,201 $ 11,087