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Fair Value Measurements - Segregated by Level of Valuation Inputs (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial assets:    
Portfolio loans, net $ 6,713,129 $ 6,633,501
Mortgage servicing rights 2,200,000  
Financial liabilities:    
Short-term borrowings 4,658 8,551
Junior subordinated debt owed to unconsolidated trusts 71,468 71,308
Level 1 | Carrying Amount    
Financial assets:    
Cash and cash equivalents 688,537 529,288
Level 1 | Fair Value    
Financial assets:    
Cash and cash equivalents 688,537 529,288
Level 2 | Carrying Amount    
Financial assets:    
Accrued interest receivable 33,240 27,109
Financial liabilities:    
Time deposits 1,119,348 1,534,850
Securities sold under agreements to repurchase 175,614 205,491
Short-term borrowings 4,658 8,551
Long-term debt 4,757 83,600
Junior subordinated debt owed to unconsolidated trusts 71,468 71,308
Accrued interest payable 3,401 5,000
Level 2 | Fair Value    
Financial assets:    
Accrued interest receivable 33,240 27,109
Financial liabilities:    
Time deposits 1,132,107 1,538,597
Securities sold under agreements to repurchase 175,614 205,491
Short-term borrowings 4,661 8,552
Long-term debt 5,014 83,614
Junior subordinated debt owed to unconsolidated trusts 59,943 74,153
Accrued interest payable 3,401 5,000
Level 3 | Carrying Amount    
Financial assets:    
Portfolio loans, net 6,713,129 6,633,501
Mortgage servicing rights 10,912 12,326
Other servicing rights 1,434 1,071
Level 3 | Fair Value    
Financial assets:    
Portfolio loans, net 6,755,425 6,648,560
Mortgage servicing rights 11,107 18,193
Other servicing rights 1,966 1,740
Level 3 | Senior notes | Carrying Amount    
Financial liabilities:    
Long-term debt 39,809 39,674
Level 3 | Senior notes | Fair Value    
Financial liabilities:    
Long-term debt 40,104 40,099
Level 3 | Subordinated debt | Carrying Amount    
Financial liabilities:    
Long-term debt 182,226 59,248
Level 3 | Subordinated debt | Fair Value    
Financial liabilities:    
Long-term debt $ 187,697 $ 61,514