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Fair Value Measurements - Segregated by Level of Valuation Inputs (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets:
Portfolio loans, net	$ 7,057,833	$ 6,713,129
Financial liabilities:
Short-term borrowings	17,673	4,658
Junior subordinated debt owed to unconsolidated trusts	71,593	71,468
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	883,845	688,537
Level 1 | Fair Value
Financial assets:
Cash and cash equivalents	883,845	688,537
Level 2 | Carrying Amount
Financial assets:
Accrued interest receivable	33,545	33,240
Financial liabilities:
Time deposits	1,026,935	1,119,348
Securities sold under agreements to repurchase	241,242	175,614
Short-term borrowings	17,673	4,658
Long-term debt	49,233	4,757
Junior subordinated debt owed to unconsolidated trusts	71,593	71,468
Accrued interest payable	5,435	3,401
Level 2 | Fair Value
Financial assets:
Accrued interest receivable	33,545	33,240
Financial liabilities:
Time deposits	1,029,879	1,132,107
Securities sold under agreements to repurchase	241,242	175,614
Short-term borrowings	17,671	4,661
Long-term debt	49,323	5,014
Junior subordinated debt owed to unconsolidated trusts	62,840	59,943
Accrued interest payable	5,435	3,401
Level 3 | Carrying Amount
Financial assets:
Portfolio loans, net	7,057,833	6,713,129
Mortgage servicing rights	9,247	10,912
Other servicing rights	1,680	1,434
Level 3 | Fair Value
Financial assets:
Portfolio loans, net	7,108,483	6,755,425
Mortgage servicing rights	11,011	11,107
Other servicing rights	2,127	1,966
Level 3 | Senior notes | Carrying Amount
Financial liabilities:
Long-term debt	39,910	39,809
Level 3 | Senior notes | Fair Value
Financial liabilities:
Long-term debt	40,700	40,104
Level 3 | Subordinated debt | Carrying Amount
Financial liabilities:
Long-term debt	182,637	182,226
Level 3 | Subordinated debt | Fair Value
Financial liabilities:
Long-term debt	$ 196,350	$ 187,697

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