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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance $ 269,366,000 $ 249,001,000 $ 249,001,000  
Provision for credit losses 24,544,000 (6,950,000)    
Loans charged off 16,903,000 1,900,000    
Recoveries of loans previously charged off 2,899,000 2,954,000    
Provision for credit losses 23,333,000 (6,350,000)    
Ending balance 278,695,000 243,705,000 269,366,000  
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) 1,211,000 (600,000)    
Off-Balance-Sheet, Credit Loss, Liability 17,539,000 13,933,000    
ACL - loans 278,695,000   269,366,000  
Loans - Excluding OBS Credit Exposure [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans charged off 16,903,000 1,900,000    
Recoveries of loans previously charged off 2,899,000 2,954,000    
Provision for credit losses 23,333,000 (6,350,000)    
ACL - loans 278,695,000 243,705,000 269,366,000 $ 249,001,000
Loans - Excluding OBS Credit Exposure [Member] | Real estate - commercial mortgage        
Allowance for Loan and Lease Losses [Roll Forward]        
Loans charged off 13,362,000 152,000    
Recoveries of loans previously charged off 786,000 112,000    
Provision for credit losses 9,376,000 (8,077,000)    
ACL - loans $ 66,256,000 $ 79,853,000 $ 69,456,000 $ 87,970,000