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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, due from banks, money market,    and other interest-earning investments $ 822,019 $ 589,712
Loans, net 13,494,505 13,655,091
Accrued interest receivable 84,109 85,306
Noninterest-bearing demand deposits 6,303,106 5,633,672
Time deposits 960,413 1,122,870
Federal funds purchased and interbank borrowings 276 1,166
Securities sold under agreements to repurchase 392,275 431,166
Federal Home Loan Bank advances 1,886,019 1,991,435
Other borrowings 296,670 252,787
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, due from banks, money market,    and other interest-earning investments 822,019 589,712
Accrued interest receivable 84,109 85,306
Noninterest-bearing demand deposits 6,303,106 5,633,672
Checking, NOW, savings, and money market    interest-bearing deposits 11,305,676 10,280,911
Time deposits 960,413 1,122,870
Federal funds purchased and interbank borrowings 276 1,166
Securities sold under agreements to repurchase 392,275 431,166
Federal Home Loan Bank advances 1,886,019 1,991,435
Other borrowings 296,670 252,787
Accrued interest payable 5,496 5,443
Standby letters of credit 454 462
Commitments to extend credit 0 0
Carrying Value | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 3,363,175 3,922,642
Carrying Value | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 6,315,574 5,867,795
Carrying Value | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 2,245,942 2,235,814
Carrying Value | Consumer credit, net of unearned income    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 1,569,814 1,628,840
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, due from banks, money market,    and other interest-earning investments 822,019 589,712
Accrued interest receivable 688 21
Noninterest-bearing demand deposits 6,303,106 5,633,672
Checking, NOW, savings, and money market    interest-bearing deposits 11,305,676 10,180,911
Time deposits 0 0
Federal funds purchased and interbank borrowings 276 1,166
Securities sold under agreements to repurchase 392,275 431,166
Federal Home Loan Bank advances 0 0
Other borrowings 0 0
Accrued interest payable 0 0
Standby letters of credit 0 0
Commitments to extend credit 0 0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer credit, net of unearned income    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, due from banks, money market,    and other interest-earning investments 0 0
Accrued interest receivable 35,790 27,977
Noninterest-bearing demand deposits 0 0
Checking, NOW, savings, and money market    interest-bearing deposits 0 99,957
Time deposits 968,658 1,140,922
Federal funds purchased and interbank borrowings 0 0
Securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 1,935,140 2,092,033
Other borrowings 311,532 254,612
Accrued interest payable 5,496 5,443
Standby letters of credit 0 0
Commitments to extend credit 0 0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Consumer credit, net of unearned income    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 0 0
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, due from banks, money market,    and other interest-earning investments 0 0
Accrued interest receivable 47,631 57,308
Noninterest-bearing demand deposits 0 0
Checking, NOW, savings, and money market    interest-bearing deposits 0 0
Time deposits 0 0
Federal funds purchased and interbank borrowings 0 0
Securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 0 0
Other borrowings 0 0
Accrued interest payable 0 0
Standby letters of credit 454 462
Commitments to extend credit 4,678 11,822
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 3,335,009 3,912,948
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 6,211,854 5,797,447
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 2,216,900 2,264,274
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Consumer credit, net of unearned income    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net $ 1,582,600 $ 1,618,365