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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Assets    
Securities available-for-sale, amortized cost $ 1,959,773,000 $ 1,600,984,000
Securities available-for-sale, allowance for credit Losses 0 0
Securities held to maturity, net of allowance for credit losses 0 0
Securities held to maturity, fair value $ 563,115,000 $ 746,202,000
Shareholders' Equity    
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, authorized (in shares) 250,000,000 250,000,000
Common stock, issued (in shares) 63,424,526 64,200,111
Common stock, outstanding (in shares) 63,424,526 64,200,111