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Securities - Gross Unrealized Losses and Fair Value of Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, Less Than 12 Months, Fair Value $ 170,801 $ 38,323
Securities in unrealized loss position, Less Than 12 Months, Unrealized Losses 1,181 539
Securities in unrealized loss position, 12 Months or More, Fair Value 67,639 49,148
Securities in unrealized loss position, 12 Months or More, Unrealized Losses 2,413 1,145
Securities in unrealized loss position, Total, Fair Value 238,440 87,471
Securities in unrealized loss position, Total, Unrealized Losses 3,594 1,684
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, Less Than 12 Months, Fair Value 4,966  
Securities in unrealized loss position, Less Than 12 Months, Unrealized Losses 3  
Securities in unrealized loss position, Total, Fair Value 4,966  
Securities in unrealized loss position, Total, Unrealized Losses 3  
US government agencies    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, Less Than 12 Months, Fair Value   14,842
Securities in unrealized loss position, Less Than 12 Months, Unrealized Losses   100
Securities in unrealized loss position, 12 Months or More, Fair Value 16,268 6,465
Securities in unrealized loss position, 12 Months or More, Unrealized Losses 225 57
Securities in unrealized loss position, Total, Fair Value 16,268 21,307
Securities in unrealized loss position, Total, Unrealized Losses 225 157
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, Less Than 12 Months, Fair Value 164,836 23,481
Securities in unrealized loss position, Less Than 12 Months, Unrealized Losses 1,177 439
Securities in unrealized loss position, 12 Months or More, Fair Value 51,371 40,648
Securities in unrealized loss position, 12 Months or More, Unrealized Losses 2,188 1,033
Securities in unrealized loss position, Total, Fair Value 216,207 64,129
Securities in unrealized loss position, Total, Unrealized Losses 3,365 1,472
Municipal bond    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, Less Than 12 Months, Fair Value 999  
Securities in unrealized loss position, Less Than 12 Months, Unrealized Losses 1  
Securities in unrealized loss position, 12 Months or More, Fair Value 0  
Securities in unrealized loss position, 12 Months or More, Unrealized Losses 0  
Securities in unrealized loss position, Total, Fair Value 999  
Securities in unrealized loss position, Total, Unrealized Losses $ 1  
Mutual fund    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, Less Than 12 Months, Fair Value   0
Securities in unrealized loss position, Less Than 12 Months, Unrealized Losses   0
Securities in unrealized loss position, 12 Months or More, Fair Value   2,035
Securities in unrealized loss position, 12 Months or More, Unrealized Losses   55
Securities in unrealized loss position, Total, Fair Value   2,035
Securities in unrealized loss position, Total, Unrealized Losses   $ 55