Fair Value Measurements - Segregated by Level of Valuation Inputs (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial assets:
Fair Value	$ 876,738
Debt securities held to maturity	876,738
Portfolio loans, net	7,409,021	$ 7,101,111
Financial liabilities:
Short-term borrowings	16,396	17,678
Junior subordinated debt owed to unconsolidated trusts	71,721	71,635
Level 1 | Carrying Amount
Financial assets:
Cash and cash equivalents	230,852	836,095
Level 1 | Fair Value
Financial assets:
Cash and cash equivalents	230,852	836,095
Level 2 | Carrying Amount
Financial assets:
Fair Value	953,012
Debt securities held to maturity	953,012
Loans held for sale	4,813
Accrued interest receivable	32,886	31,064
Financial liabilities:
Time deposits	817,821	935,649
Securities sold under agreements to repurchase	228,383	270,139
Short-term borrowings	16,396	17,678
Long-term debt	36,000	46,056
Junior subordinated debt owed to unconsolidated trusts	71,721	71,635
Accrued interest payable	1,978	2,728
Level 2 | Fair Value
Financial assets:
Fair Value	876,738
Debt securities held to maturity	876,738
Loans held for sale	4,818
Accrued interest receivable	32,886	31,064
Financial liabilities:
Time deposits	800,416	935,778
Securities sold under agreements to repurchase	228,383	270,139
Short-term borrowings	16,480	17,673
Long-term debt	36,101	46,164
Junior subordinated debt owed to unconsolidated trusts	61,349	63,586
Accrued interest payable	1,978	2,728
Level 3 | Carrying Amount
Financial assets:
Portfolio loans, net	7,409,021	7,101,111
Mortgage servicing rights	7,282	8,608
Other servicing rights	1,829	1,830
Level 3 | Fair Value
Financial assets:
Portfolio loans, net	7,293,303	7,161,466
Mortgage servicing rights	17,967	12,133
Other servicing rights	2,235	2,268
Level 3 | Senior notes | Carrying Amount
Financial liabilities:
Long-term debt		39,944
Level 3 | Senior notes | Fair Value
Financial liabilities:
Long-term debt		40,400
Level 3 | Subordinated debt | Carrying Amount
Financial liabilities:
Long-term debt	281,304	182,773
Level 3 | Subordinated debt | Fair Value
Financial liabilities:
Long-term debt	$ 280,275	$ 195,600