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Fair Value Measurements (Financial Instruments) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Financial assets:        
Cash and Cash Equivalents, at Carrying Value $ 428,326 $ 685,163 $ 644,940 $ 418,083
Available for sale debt securities, at fair value 2,072,337 2,057,851    
Investment securities held to maturity, fair value 417,664 449,709    
Federal Home Loan Bank stock 23,973 34,290    
Equity securities 1,256 1,325    
Loans, net of allowance for credit losses 9,586,607 9,500,884    
Derivative assets 79,170 66,464    
Financial liabilities:        
Certificates of deposit 691,655 692,515    
Total deposits 11,366,087 11,234,012    
Borrowed funds 399,606 626,774    
Subordinated debentures 10,336 10,283    
Derivative Liability 60,686 62,472    
Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Cash and Cash Equivalents, at Carrying Value 433,146 712,463    
Available for sale debt securities, at fair value 260,165 196,329    
Investment securities held to maturity, fair value 10,805 9,821    
Federal Home Loan Bank stock 23,973 34,290    
Equity securities 1,256 1,325    
Loans, net of allowance for credit losses 0 0    
Derivative assets 0 0    
Financial liabilities:        
Deposits other than certificates of deposits 10,674,432 10,541,497    
Certificates of deposit 0 0    
Total deposits 10,674,432 10,541,497    
Borrowed funds 0 0    
Subordinated debentures 0 0    
Derivative Liability 0 0    
Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Cash and Cash Equivalents, at Carrying Value 0 0    
Available for sale debt securities, at fair value 1,812,172 1,861,522    
Investment securities held to maturity, fair value 406,859 439,888    
Federal Home Loan Bank stock 0 0    
Equity securities 0 0    
Loans, net of allowance for credit losses 0 0    
Derivative assets 79,231 65,903    
Financial liabilities:        
Deposits other than certificates of deposits 0 0    
Certificates of deposit 690,591 694,041    
Total deposits 690,591 694,041    
Borrowed funds 386,705 625,636    
Subordinated debentures 9,594 9,750    
Derivative Liability 60,644 61,412    
Significant Unobservable Inputs (Level 3)        
Financial assets:        
Cash and Cash Equivalents, at Carrying Value 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 9,586,361 9,607,225    
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 260,165 196,329    
Investment securities held to maturity, fair value 1,430      
U.S. Treasury obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Available for sale debt securities, at fair value 260,165 196,329    
Investment securities held to maturity, fair value 1,430      
U.S. Treasury obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Investment securities held to maturity, fair value 0      
U.S. Treasury 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      
Agency obligations | Quoted Prices in Active  Markets for Identical Assets (Level 1)        
Financial assets:        
Investment securities held to maturity, fair value 9,375 9,821    
Agency obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Investment securities held to maturity, fair value 0 0    
Agency obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Investment securities held to maturity, fair value 0 0    
Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 1,670,464 1,708,831    
Investment securities held to maturity, fair value 13 21    
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    
Investment securities held to maturity, fair value 0 0    
Mortgage-backed securities | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Available for sale debt securities, at fair value 1,670,464 1,708,831    
Investment securities held to maturity, fair value 13 21    
Mortgage-backed securities | 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    
Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 44,936 46,797    
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 44,936 46,797    
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 63,846 69,707    
Investment securities held to maturity, fair value 397,415 429,552    
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 63,846 69,707    
Investment securities held to maturity, fair value 397,415 429,552    
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 32,926 36,187    
Investment securities held to maturity, fair value 9,431 10,315    
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 32,926 36,187    
Investment securities held to maturity, fair value 9,431 10,315    
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, at Carrying Value 433,146 712,463    
Available for sale debt securities, at fair value 2,072,337 2,057,851    
Investment securities held to maturity, fair value 421,958 436,150    
Federal Home Loan Bank stock 23,973 34,290    
Equity securities 1,256 1,325    
Loans, net of allowance for credit losses 9,586,607 9,500,884    
Derivative assets 79,231 65,903    
Financial liabilities:        
Deposits other than certificates of deposits 10,674,432 10,541,497    
Certificates of deposit 691,655 692,515    
Total deposits 11,366,087 11,234,012    
Borrowed funds 399,606 626,774    
Subordinated debentures 10,336 10,283    
Derivative Liability 60,644 61,412    
Carrying Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 260,165 196,329    
Investment securities held to maturity, fair value 1,430      
Carrying Value | Agency obligations        
Financial assets:        
Investment securities held to maturity, fair value 9,997 9,996    
Carrying Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 1,670,464 1,708,831    
Investment securities held to maturity, fair value 13 21    
Carrying Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 44,936 46,797    
Carrying Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 63,846 69,707    
Investment securities held to maturity, fair value 400,606 415,699    
Carrying Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 32,926 36,187    
Investment securities held to maturity, fair value 9,912 10,434    
Fair Value        
Financial assets:        
Cash and Cash Equivalents, at Carrying Value 433,146 712,463    
Available for sale debt securities, at fair value 2,072,337 2,057,851    
Investment securities held to maturity, fair value 417,664 449,709    
Federal Home Loan Bank stock 23,973 34,290    
Equity securities 1,256 1,325    
Loans, net of allowance for credit losses 9,586,361 9,607,225    
Derivative assets 79,231 65,903    
Financial liabilities:        
Deposits other than certificates of deposits 10,674,432 10,541,497    
Certificates of deposit 690,591 694,041    
Total deposits 11,365,023 11,235,538    
Borrowed funds 386,705 625,636    
Subordinated debentures 9,594 9,750    
Derivative Liability 60,644 61,412    
Fair Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 260,165 196,329    
Investment securities held to maturity, fair value 1,430      
Fair Value | Agency obligations        
Financial assets:        
Investment securities held to maturity, fair value 9,375 9,821    
Fair Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 1,670,464 1,708,831    
Investment securities held to maturity, fair value 13 21    
Fair Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 44,936 46,797    
Fair Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 63,846 69,707    
Investment securities held to maturity, fair value 397,415 429,552    
Fair Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 32,926 36,187    
Investment securities held to maturity, fair value $ 9,431 $ 10,315