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Investment Securities - Gross Unrealized Losses and Fair Value of Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value $ 318,320 $ 38,323
Securities in unrealized loss position, less than 12 months, unrealized losses 4,435 539
Securities in unrealized loss position, 12 months or more, fair value 50,365 49,148
Securities in unrealized loss position, 12 months or more, unrealized losses 2,178 1,145
Securities in unrealized loss position, fair value 368,685 87,471
Securities in unrealized loss position, unrealized losses 6,613 1,684
US treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value 4,952  
Securities in unrealized loss position, less than 12 months, unrealized losses 9  
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, fair value 4,952  
Securities in unrealized loss position, unrealized losses 9  
US government agencies    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value 21,045 14,842
Securities in unrealized loss position, less than 12 months, unrealized losses 343 100
Securities in unrealized loss position, 12 months or more, fair value 6,462 6,465
Securities in unrealized loss position, 12 months or more, unrealized losses 52 57
Securities in unrealized loss position, fair value 27,507 21,307
Securities in unrealized loss position, unrealized losses 395 157
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value 292,323 23,481
Securities in unrealized loss position, less than 12 months, unrealized losses 4,083 439
Securities in unrealized loss position, 12 months or more, fair value 41,850 40,648
Securities in unrealized loss position, 12 months or more, unrealized losses 2,050 1,033
Securities in unrealized loss position, fair value 334,173 64,129
Securities in unrealized loss position, unrealized losses 6,133 1,472
Mutual fund    
Debt Securities, Available-for-sale [Line Items]    
Securities in unrealized loss position, less than 12 months, fair value 0 0
Securities in unrealized loss position, less than 12 months, unrealized losses 0 0
Securities in unrealized loss position, 12 months or more, fair value 2,053 2,035
Securities in unrealized loss position, 12 months or more, unrealized losses 76 55
Securities in unrealized loss position, fair value 2,053 2,035
Securities in unrealized loss position, unrealized losses $ 76 $ 55