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Fair Value Measurements - Segregated by Level of Valuation Inputs (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial assets:
Portfolio loans, net	$ 7,090,240	$ 6,713,129
Financial liabilities:
Short-term borrowings	30,168	4,658
Junior subordinated debt owed to unconsolidated trusts	71,551	71,468
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	920,810	688,537
Level 1 | Fair Value
Financial assets:
Cash and cash equivalents	920,810	688,537
Level 2 | Carrying Amount
Financial assets:
Accrued interest receivable	32,689	33,240
Financial liabilities:
Time deposits	1,115,596	1,119,348
Securities sold under agreements to repurchase	207,266	175,614
Short-term borrowings	30,168	4,658
Long-term debt	52,409	4,757
Junior subordinated debt owed to unconsolidated trusts	71,551	71,468
Accrued interest payable	3,013	3,401
Level 2 | Fair Value
Financial assets:
Accrued interest receivable	32,689	33,240
Financial liabilities:
Time deposits	1,121,554	1,132,107
Securities sold under agreements to repurchase	207,266	175,614
Short-term borrowings	30,169	4,661
Long-term debt	52,532	5,014
Junior subordinated debt owed to unconsolidated trusts	62,141	59,943
Accrued interest payable	3,013	3,401
Level 3 | Carrying Amount
Financial assets:
Portfolio loans, net	7,090,240	6,713,129
Mortgage servicing rights	10,153	10,912
Other servicing rights	1,573	1,434
Level 3 | Fair Value
Financial assets:
Portfolio loans, net	7,161,247	6,755,425
Mortgage servicing rights	12,187	11,107
Other servicing rights	2,084	1,966
Level 3 | Senior notes | Carrying Amount
Financial liabilities:
Long-term debt	39,876	39,809
Level 3 | Senior notes | Fair Value
Financial liabilities:
Long-term debt	40,900	40,104
Level 3 | Subordinated debt | Carrying Amount
Financial liabilities:
Long-term debt	182,503	182,226
Level 3 | Subordinated debt | Fair Value
Financial liabilities:
Long-term debt	$ 184,725	$ 187,697

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