Borrowings and Subordinated Debentures - Subordinated Debentures (Details) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)
Subordinated Borrowing [Line Items]
Subordinated debt	$ 941,923		$ 936,599
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.06%	5.06%	4.92%
Subordinated Debentures, Gross	$ 1,012,187		$ 1,013,419
Debt Issuance Costs, Gross	$ 3,800
Trust Preferred Securities Two Thousand Six Series Three
Subordinated Borrowing [Line Items]
Liability, Reporting Currency Denominated, Value | €		€ 25.8
Subordinated notes due May 2031
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.52%
Euribor Rate [Member] | Trust Preferred Securities Two Thousand Six Series Three
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.05%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt Trust V Due September 2033 [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.10%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt Trust VI Due September 2033 [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.05%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt Trust CII Due September 2033 [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.95%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt Trust VII Due April 2034 [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt Trust CIII Due September 2035 [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.69%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt Trust FCCI Due March 2037 [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.60%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subordinated Debt Trust FCBI Due December 2035 [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.55%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Trust Preferred Securities Two Thousand Five Series One [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Trust Preferred Securities Two Thousand Five Series Two [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Two Thousand Six One Term Debt Securitization [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Trust Preferred Securities Two Thousand Six Series Five [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Two Thousand Seven One Term Debt Securitization [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | PMB Statutory Trust III
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.40%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | PMB CapitalTrust III
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Prime Rate | Two Thousand Six Two Term Debt Securitization [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Prime Rate | Trust Preferred Securities Two Thousand Six Series Four [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Subordinated Debt
Subordinated Borrowing [Line Items]
Debt Instrument, Unamortized Discount	$ (70,264)		$ (76,820)
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.48%	5.48%	5.93%
Subordinated Debt | Subordinated Debt Trust V Due September 2033 [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 10,310		$ 10,310
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	7.71%	7.71%	8.74%
Subordinated Debt | Subordinated Debt Trust VI Due September 2033 [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 10,310		$ 10,310
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	7.67%	7.67%	8.70%
Subordinated Debt | Subordinated Debt Trust CII Due September 2033 [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 5,155		$ 5,155
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	7.56%	7.56%	8.59%
Subordinated Debt | Subordinated Debt Trust VII Due April 2034 [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 61,856		$ 61,856
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	7.60%	7.60%	8.40%
Subordinated Debt | Subordinated Debt Trust CIII Due September 2035 [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 20,619		$ 20,619
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.31%	6.31%	7.34%
Subordinated Debt | Subordinated Debt Trust FCCI Due March 2037 [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 16,495		$ 16,495
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.22%	6.22%	7.25%
Subordinated Debt | Subordinated Debt Trust FCBI Due December 2035 [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 10,310		$ 10,310
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.17%	6.17%	7.20%
Subordinated Debt | Trust Preferred Securities Two Thousand Five Series One [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 82,475		$ 82,475
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.57%	6.57%	7.60%
Subordinated Debt | Trust Preferred Securities Two Thousand Five Series Two [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 128,866		$ 128,866
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.80%	6.80%	7.60%
Subordinated Debt | Two Thousand Six One Term Debt Securitization [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 51,545		$ 51,545
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	9.95%	9.95%	10.45%
Subordinated Debt | Two Thousand Six Two Term Debt Securitization [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 51,550		$ 51,550
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.80%	6.80%	7.60%
Subordinated Debt | Trust Preferred Securities Two Thousand Six Series Three
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 26,687		$ 28,453
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.10%	5.10%	6.00%
Subordinated Debt | Trust Preferred Securities Two Thousand Six Series Four [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 16,470		$ 16,470
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	9.95%	9.95%	10.45%
Subordinated Debt | Trust Preferred Securities Two Thousand Six Series Five [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 6,650		$ 6,650
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.80%	6.80%	7.60%
Subordinated Debt | Two Thousand Seven One Term Debt Securitization [Member]
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 39,177		$ 39,177
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.80%	6.80%	7.60%
Subordinated Debt | Subordinated notes due May 2031
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 381,185		$ 380,651
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	3.25%	3.25%	3.25%
Subordinated Debt | PMB Statutory Trust III
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 7,217		$ 7,217
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	7.99%	7.99%	9.02%
Subordinated Debt | PMB CapitalTrust III
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 10,310		$ 10,310
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.89%	6.89%	7.66%
Subordinated Debt | Subordinated Notes Due October 30, 2030
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 75,000		$ 75,000
Debt Instrument, Basis Spread on Variable Rate	4.195%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.375%	4.375%	4.375%