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Investment Securities - Summary of Unrealized Losses of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Securities with losses under 12 months, fair value $ 123,728 $ 93,037
Securities with losses under 12 months, gross unrealized loss 2,454 826
Securities with losses over 12 months, fair value 143,958 158,412
Securities with losses over 12 months, gross unrealized loss 6,779 4,528
Fair Value 267,686 251,449
Gross Unrealized Loss 9,233 5,354
Obligations of state and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Securities with losses under 12 months, fair value 576 596
Securities with losses under 12 months, gross unrealized loss 24 5
Securities with losses over 12 months, fair value 12,405 12,716
Securities with losses over 12 months, gross unrealized loss 722 437
Fair Value 12,981 13,312
Gross Unrealized Loss 746 442
GSE mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Securities with losses under 12 months, fair value 34,138 29,725
Securities with losses under 12 months, gross unrealized loss 893 224
Securities with losses over 12 months, fair value 5,344 5,858
Securities with losses over 12 months, gross unrealized loss 200 97
Fair Value 39,482 35,583
Gross Unrealized Loss 1,093 321
Collateralized mortgage obligations: residential    
Debt Securities, Available-for-sale [Line Items]    
Securities with losses under 12 months, fair value 82,531 57,665
Securities with losses under 12 months, gross unrealized loss 1,430 548
Securities with losses over 12 months, fair value 124,108 137,598
Securities with losses over 12 months, gross unrealized loss 5,809 3,960
Fair Value 206,639 195,263
Gross Unrealized Loss 7,239 4,508
Collateralized mortgage obligations: commercial    
Debt Securities, Available-for-sale [Line Items]    
Securities with losses under 12 months, fair value 0 0
Securities with losses under 12 months, gross unrealized loss 0 0
Securities with losses over 12 months, fair value 2,101 2,240
Securities with losses over 12 months, gross unrealized loss 48 34
Fair Value 2,101 2,240
Gross Unrealized Loss 48 34
Mutual funds    
Debt Securities, Available-for-sale [Line Items]    
Securities with losses under 12 months, fair value   2,061
Securities with losses under 12 months, fair value, gross unrealized loss   39
Securities with losses over 12 months, fair value   0
Securities with losses over 12 months, gross unrealized loss   0
Fair Value   2,061
Gross Unrealized Loss   39
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Securities with losses under 12 months, fair value 6,483 2,990
Securities with losses under 12 months, gross unrealized loss 107 10
Securities with losses over 12 months, fair value 0 0
Securities with losses over 12 months, gross unrealized loss 0 0
Fair Value 6,483 2,990
Gross Unrealized Loss $ 107 $ 10