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Investment Securities - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
investment_security
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
investment_security
Dec. 31, 2021
USD ($)
Investment Securities        
Net carrying amount of securities transferred from available-for-sale to held-to-maturity $ 360,347,000 $ 618,678,000    
Accumulated other comprehensive loss, net of tax (262,729,000)   $ (265,247,000)  
Investments held-to-maturity, allowance for credit losses 227,000 41,000 43,000 $ 22,000
Allowance for Credit Losses 0   0  
Available-for-sale securities, provision for credit losses $ 0   $ 0  
Available-for-sale and held-to-maturity securities in nonaccrual status | investment_security 0   0  
Available-for-sale and held-to-maturity securities purchased with deterioration in credit quality | investment_security 0   0  
Available-for-sale and held-to-maturity collateral dependent | investment_security 0   0  
FHLB stock $ 25,700,000   $ 27,700,000  
FRB stock 74,900,000   74,800,000  
Other stock 4,900,000   17,400,000  
Impairment loss on investments in FHLB, FRB and other stock 0      
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Investment Securities        
Accumulated other comprehensive loss before tax amount (253,000,000)   (303,700,000)  
Accumulated other comprehensive loss, net of tax (181,100,000)   (217,400,000)  
AOCI, Accumulated Gain (Loss), Debt Securities Transferred To Held-To-Maturity, Available-For-Sale, Parent        
Investment Securities        
Accumulated other comprehensive loss before tax amount (114,100,000)      
Accumulated other comprehensive loss, net of tax (81,600,000)      
Public deposits, Other Borrowings, and Other Purposes | Asset Pledged as Collateral        
Investment Securities        
Investments at carrying value 3,610,000,000   195,600,000  
Federal Reserve Discount Window | Asset Pledged as Collateral        
Investment Securities        
Investments at carrying value 1,530,000,000      
Federal Reserves New Bank Term Funding Program | Asset Pledged as Collateral        
Investment Securities        
Investments at carrying value 1,890,000,000      
Mortgage-backed securities        
Investment Securities        
Securities transferred from available-for-sale to held-to-maturity 410,700,000 255,000,000    
Net carrying amount of securities transferred from available-for-sale to held-to-maturity 360,300,000 238,800,000    
Debt securities, held-to-maturity, transfer, unrealized loss (50,400,000) (16,200,000)    
Investments held-to-maturity, allowance for credit losses 0   0  
Municipal bonds        
Investment Securities        
Securities transferred from available-for-sale to held-to-maturity   386,800,000    
Net carrying amount of securities transferred from available-for-sale to held-to-maturity   379,900,000    
Debt securities, held-to-maturity, transfer, unrealized loss   $ (6,900,000)    
Investments held-to-maturity, allowance for credit losses $ 227,000   $ 43,000  
U.S. Treasury, U.S. Government Agency, and U.S. Government-Sponsored Enterprise Securities        
Investment Securities        
Percentage of total debt securities, available for sale 50.00%