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Securities - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Investments [Line Items]      
Debt Securities, Available-for-sale, Allowance for Credit Loss $ 0   $ 0
Debt Securities, Held-to-maturity, Credit Loss Expense (Reversal) 0 $ 0  
Transferred Securities, Unrealized Loss, Before Tax 40,400,000   1,500,000
Securities transferred, Unrealized Loss, Net of Tax 31,900,000   1,200,000
Fair value of securities transferred from AFS to HTM 385,800,000   0
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Net gain (loss) on sale of securities AFS (1,543,000) 2,003,000  
Gross realized gains on AFS securities 238,000 2,100,000  
Gross realized losses on AFS securities 1,800,000 52,000  
Equity investments 11,475,000   11,841,000
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Sale of HTM portfolio 0 $ 0  
Interest receivable 28,367,000   39,145,000
Debt Securities, Held-to-maturity, Nonaccrual 0   0
FHLB stock with other-than-temporary impairment 0    
Other-than-temporarily impaired equity investments 0    
Investment Securities, Not Separately Reported $ 1,490,000,000   1,610,000,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 500    
Financial Asset, Past Due      
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Securities held to maturity (estimated fair value of $138,879) $ 0   0
Available-for-sale Securities      
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Interest receivable 13,000,000   25,600,000
Held-to-maturity Securities      
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Interest receivable $ 2,800,000   $ 244,000