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Allowance for Credit Losses (Allowance for Credit Losses Methodology) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Allowance for credit losses on loans and leases      
Balance, beginning of period $ 424,629 $ 440,871 $ 440,871
Provision (recapture) for credit losses for loans and leases 26,187 17,476  
Charge-offs (34,113) (49,753)  
Recoveries 4,792 5,750  
Net recoveries (charge-offs) (29,321) (44,003)  
Balance, end of period 421,495 414,344 424,629
Reserve for unfunded commitments      
Balance, beginning of period 16,168 23,208 23,208
Provision (recapture) for credit losses on unfunded commitments 1,216 (340)  
Balance, end of period 17,384 22,868 16,168
Total allowance for credit losses 438,879 437,212 440,800
Commercial real estate      
Allowance for credit losses on loans and leases      
Balance, beginning of period 154,413 125,888 125,888
Provision (recapture) for credit losses for loans and leases 14,080 20,191  
Charge-offs (119) (161)  
Recoveries 19 358  
Net recoveries (charge-offs) (100) 197  
Balance, end of period 168,393 146,276 154,413
Reserve for unfunded commitments      
Balance, beginning of period 5,932 11,170 11,170
Provision (recapture) for credit losses on unfunded commitments 1,833 1,858  
Balance, end of period 7,765 13,028 5,932
Total allowance for credit losses 176,158 159,304  
Commercial      
Allowance for credit losses on loans and leases      
Balance, beginning of period 218,668 244,821 244,821
Provision (recapture) for credit losses for loans and leases 24,090 436  
Charge-offs (32,611) (47,232)  
Recoveries 4,336 4,732  
Net recoveries (charge-offs) (28,275) (42,500)  
Balance, end of period 214,483 202,757 218,668
Reserve for unfunded commitments      
Balance, beginning of period 6,935 7,841 7,841
Provision (recapture) for credit losses on unfunded commitments 74 (1,951)  
Balance, end of period 7,009 5,890 6,935
Total allowance for credit losses 221,492 208,647  
Residential      
Allowance for credit losses on loans and leases      
Balance, beginning of period 44,700 62,004 62,004
Provision (recapture) for credit losses for loans and leases (11,850) (3,674)  
Charge-offs (303) (490)  
Recoveries 98 170  
Net recoveries (charge-offs) (205) (320)  
Balance, end of period 32,645 58,010 44,700
Reserve for unfunded commitments      
Balance, beginning of period 2,084 2,940 2,940
Provision (recapture) for credit losses on unfunded commitments (568) (183)  
Balance, end of period 1,516 2,757 2,084
Total allowance for credit losses 34,161 60,767  
Consumer & other, net      
Allowance for credit losses on loans and leases      
Balance, beginning of period 6,848 8,158 8,158
Provision (recapture) for credit losses for loans and leases (133) 523  
Charge-offs (1,080) (1,870) (6,339)
Recoveries 339 490  
Net recoveries (charge-offs) (741) (1,380)  
Balance, end of period 5,974 7,301 6,848
Reserve for unfunded commitments      
Balance, beginning of period 1,217 1,257 1,257
Provision (recapture) for credit losses on unfunded commitments (123) (64)  
Balance, end of period 1,094 1,193 $ 1,217
Total allowance for credit losses $ 7,068 $ 8,494