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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investment Holdings [Line Items]    
Amortized Cost $ 939,352 $ 812,174
Gross Unrealized Gains 2,062 5,483
Gross Unrealized Losses (20,677) (7,127)
Fair Value 920,737 810,530
U.S. Treasury and U.S. Government-sponsored agencies    
Investment Holdings [Line Items]    
Amortized Cost 84,252 13,460
Gross Unrealized Gains 51 6
Gross Unrealized Losses (505) (24)
Fair Value 83,798 13,442
Municipal securities    
Investment Holdings [Line Items]    
Amortized Cost 164,641 247,358
Gross Unrealized Gains 887 3,720
Gross Unrealized Losses (1,456) (1,063)
Fair Value 164,072 250,015
Residential    
Investment Holdings [Line Items]    
Amortized Cost 321,145 282,724
Gross Unrealized Gains 207 422
Gross Unrealized Losses (9,436) (2,935)
Fair Value 311,916 280,211
Commercial    
Investment Holdings [Line Items]    
Amortized Cost 318,165 219,696
Gross Unrealized Gains 162 444
Gross Unrealized Losses (9,213) (3,061)
Fair Value 309,114 217,079
Collateralized loan obligations    
Investment Holdings [Line Items]    
Amortized Cost 967 4,561
Gross Unrealized Gains 0 19
Gross Unrealized Losses 0 0
Fair Value 967 4,580
Corporate obligations    
Investment Holdings [Line Items]    
Amortized Cost 25,639 16,594
Gross Unrealized Gains 137 220
Gross Unrealized Losses (67) (44)
Fair Value 25,709 16,770
Other asset-backed securities    
Investment Holdings [Line Items]    
Amortized Cost 24,543 27,781
Gross Unrealized Gains 618 652
Gross Unrealized Losses 0 0
Fair Value $ 25,161 $ 28,433