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Fair Value Measurements - Segregated by Level of Valuation Inputs (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial assets:    
Portfolio loans, net $ 7,101,111 $ 6,713,129
Mortgage servicing rights 1,800,000  
Financial liabilities:    
Short-term borrowings 17,678 4,658
Junior subordinated debt owed to unconsolidated trusts 71,635 71,468
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 836,095 688,537
Level 1 | Fair Value    
Financial assets:    
Cash and cash equivalents 836,095 688,537
Level 2 | Carrying Amount    
Financial assets:    
Accrued interest receivable 31,064 33,240
Financial liabilities:    
Time deposits 935,649 1,119,348
Securities sold under agreements to repurchase 270,139 175,614
Short-term borrowings 17,678 4,658
Long-term debt 46,056 4,757
Junior subordinated debt owed to unconsolidated trusts 71,635 71,468
Accrued interest payable 2,728 3,401
Level 2 | Fair Value    
Financial assets:    
Accrued interest receivable 31,064 33,240
Financial liabilities:    
Time deposits 935,778 1,132,107
Securities sold under agreements to repurchase 270,139 175,614
Short-term borrowings 17,673 4,661
Long-term debt 46,164 5,014
Junior subordinated debt owed to unconsolidated trusts 63,586 59,943
Accrued interest payable 2,728 3,401
Level 3 | Carrying Amount    
Financial assets:    
Portfolio loans, net 7,101,111 6,713,129
Mortgage servicing rights 8,608 10,912
Other servicing rights 1,830 1,434
Level 3 | Fair Value    
Financial assets:    
Portfolio loans, net 7,161,466 6,755,425
Mortgage servicing rights 12,133 11,107
Other servicing rights 2,268 1,966
Level 3 | Senior notes | Carrying Amount    
Financial liabilities:    
Long-term debt 39,944 39,809
Level 3 | Senior notes | Fair Value    
Financial liabilities:    
Long-term debt 40,400 40,104
Level 3 | Subordinated debt | Carrying Amount    
Financial liabilities:    
Long-term debt 182,773 182,226
Level 3 | Subordinated debt | Fair Value    
Financial liabilities:    
Long-term debt $ 195,600 $ 187,697