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Other Borrowings - FHLB Advances (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Credit facility with the FHLB $ 921,700,000  
Advances outstanding 0 $ 92,500,000
FHLB Advances:    
Average balance during the year 33,913,000 105,646,000
Maximum month-end balance during the year $ 154,500,000 $ 137,450,000
Weighted average rate during the year 1.98% 1.16%
Weighted average rate at the end of year   1.56%
Minimum    
Federal Home Loan Bank, Advances [Line Items]    
Unencumbered collateral in amount equal to varying percentages 100.00%  
Maximum    
Federal Home Loan Bank, Advances [Line Items]    
Unencumbered collateral in amount equal to varying percentages 160.00%