XML 67 R54.htm IDEA: XBRL DOCUMENT v3.22.0.1
Securities (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 01, 2022
Mar. 31, 2020
Sep. 30, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale securities transferred to Held-to-Maturity $ 1,100,000,000 $ 873,600,000 $ 179,800,000 $ 0 $ 873,613,000 $ 0
Unrealized after tax gain (loss) on available-for-sale securities transferred to the held-to-maturity portfolio $ (1,500,000) $ 69,000,000 $ (2,200,000)      
Allowance for credit losses - securities held-to-maturity       (161,000) (191,000)  
Securities pledged as collateral to secure public funds and other deposits or securities sold under agreements to repurchase       671,700,000    
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement       152,600,000    
Proceeds from Sale of Debt Securities, Available-for-sale       37,457,000 145,631,000 737,717,000
Debt Securities, Available-for-sale, Realized Gain       769,000 2,200,000 1,000,000
Debt Securities, Available-for-sale, Realized Loss       10,000 $ 1,200,000 $ 6,900,000
Securities pledged as collateral            
Debt Securities, Available-for-sale [Line Items]            
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement       $ 152,600,000