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Loans and Leases and the Allowance for Credit Losses - Schedule of Activity in Allowance by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Allowance for Credit Losses:          
Balance at Beginning of Period $ 148,543 $ 147,477 $ 148,528 $ 146,403 $ 146,403
Loans and Leases Charged-Off (3,959) (5,336) (13,679) (13,921) (19,136)
Recoveries on Loans and Leases Previously Charged-Off 1,382 1,506 4,081 4,417  
Net Loans and Leases Charged-Off (2,577) (3,830) (9,598) (9,504)  
Provision for Credit Losses 2,812 3,684 9,848 10,432  
Balance at End of Period 148,778 147,331 148,778 147,331 148,528
Commercial          
Allowance for Credit Losses:          
Balance at Beginning of Period 78,902 80,085 83,900 74,074 74,074
Loans and Leases Charged-Off (171) (1,021) (1,776) (2,256) (2,609)
Recoveries on Loans and Leases Previously Charged-Off 98 66 253 445  
Net Loans and Leases Charged-Off (73) (955) (1,523) (1,811)  
Provision for Credit Losses (534) 2,825 (4,082) 9,692  
Balance at End of Period 78,295 81,955 78,295 81,955 83,900
Consumer          
Allowance for Credit Losses:          
Balance at Beginning of Period 69,641 67,392 64,628 72,329 72,329
Loans and Leases Charged-Off (3,788) (4,315) (11,903) (11,665) (16,527)
Recoveries on Loans and Leases Previously Charged-Off 1,284 1,440 3,828 3,972  
Net Loans and Leases Charged-Off (2,504) (2,875) (8,075) (7,693)  
Provision for Credit Losses 3,346 859 13,930 740  
Balance at End of Period $ 70,483 $ 65,376 $ 70,483 $ 65,376 $ 64,628