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Fair Value Measurements - Estimated fair value of company's financial instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Federal funds sold $ 38,934 $ 28,200
Interest bearing deposits with other banks 2,452,744 1,752,420
Investment securities 1,786,659 1,151,083
Interest bearing deposits 812,410 756,923
Customer repurchase agreements 29,401 26,726
Fair Value, Inputs, Level 2 | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 73 118
Carrying Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 8,806 8,435
Federal funds sold 38,934 28,200
Interest bearing deposits with other banks 2,452,744 1,752,420
Investment securities 1,786,659 1,150,885
Accrued interest receivable 40,028 40,104
Loans held for sale 53,413 88,205
Loans 6,767,957 7,650,633
Annuity investment 14,206 14,468
Noninterest bearing deposits 2,836,418 2,809,334
Interest bearing deposits 6,080,567 756,923
Time deposits 751,503 977,760
Customer repurchase agreements 29,401 26,726
Borrowings 369,639 568,077
Carrying Value | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 1,565 5,213
Carrying Value | Interest rate swap derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 516
Carrying Value | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 73 118
Carrying Value | Interest rate caps    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 4,882 3,413
Derivative liability 5,037 3,574
Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 8,806 8,435
Federal funds sold 38,934 28,200
Interest bearing deposits with other banks 2,452,744 1,752,420
Investment securities 1,786,659 1,150,885
Accrued interest receivable 40,028 40,104
Loans held for sale 53,413 88,205
Loans 6,624,261 7,608,687
Annuity investment 14,206 14,468
Noninterest bearing deposits 2,836,418 2,809,334
Interest bearing deposits 6,080,567 756,923
Time deposits 761,212 993,500
Customer repurchase agreements 29,401 26,726
Borrowings 376,058 575,435
Fair Value | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 1,565 5,213
Fair Value | Interest rate swap derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 516
Fair Value | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 73 118
Fair Value | Interest rate caps    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 4,882 3,413
Derivative liability 5,037 3,574
Fair Value | Fair Value, Inputs, Level 1    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 8,806 8,435
Federal funds sold 0 0
Interest bearing deposits with other banks 0 0
Investment securities 0 0
Accrued interest receivable 0 0
Loans held for sale 0 0
Loans 0 0
Annuity investment 0 0
Noninterest bearing deposits 0 0
Interest bearing deposits 0 0
Time deposits 0 0
Customer repurchase agreements 0 0
Borrowings 0 0
Fair Value | Fair Value, Inputs, Level 1 | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Fair Value | Fair Value, Inputs, Level 1 | Interest rate swap derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 1 | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 1 | Interest rate caps    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 2    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 0 0
Federal funds sold 38,934 28,200
Interest bearing deposits with other banks 2,452,744 1,752,420
Investment securities 1,785,159 1,149,385
Accrued interest receivable 40,028 40,104
Loans held for sale 53,413 88,205
Loans 0 0
Annuity investment 14,206 14,468
Noninterest bearing deposits 2,836,418 2,809,334
Interest bearing deposits 6,080,567 756,923
Time deposits 761,212 993,500
Customer repurchase agreements 29,401 26,726
Borrowings 376,058 575,435
Fair Value | Fair Value, Inputs, Level 2 | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Fair Value | Fair Value, Inputs, Level 2 | Interest rate swap derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 516
Fair Value | Fair Value, Inputs, Level 2 | Interest rate caps    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 4,882 3,413
Derivative liability 5,037 3,574
Fair Value | Fair Value, Inputs, Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks 0 0
Federal funds sold 0
Interest bearing deposits with other banks 0
Investment securities 1,500 1,500
Accrued interest receivable 0 0
Loans held for sale 0 0
Loans 6,624,261 7,608,687
Annuity investment 0 0
Noninterest bearing deposits 0 0
Interest bearing deposits 0 0
Time deposits 0 0
Customer repurchase agreements 0 0
Borrowings 0 0
Fair Value | Fair Value, Inputs, Level 3 | Mortgage banking derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 1,565 5,213
Fair Value | Fair Value, Inputs, Level 3 | Interest rate swap derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 3 | Credit risk participation agreements    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative liability 0 0
Fair Value | Fair Value, Inputs, Level 3 | Interest rate caps    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative asset 0 0
Derivative liability $ 0 $ 0