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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
investment_security
Dec. 31, 2017
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 305 184
Fair Value $ 568,268 $ 320,068
Gross Unrealized Holding Losses $ (12,371) $ (2,159)
12 Months or Longer    
Number | investment_security 87 76
Fair Value $ 144,124 $ 140,739
Gross Unrealized Holding Losses $ (6,845) $ (3,356)
Total    
Number | investment_security 392 260
Fair Value $ 712,392 $ 460,807
Gross Unrealized Holding Losses $ (19,216) $ (5,515)
Held-to-maturity, less than 12 months, number of securities | investment_security 8 2
Held-to-maturity, less than 12 months, fair value $ 25,174 $ 10,745
Held-to-maturity, less than 12 months, gross unrealized holding losses $ (585) $ (133)
Held-to-maturity, 12 months or longer, number of securities | investment_security 1 1
Held-to-maturity, 12 months or longer, fair value $ 5,953 $ 6,198
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ (253) $ (76)
Held-to-maturity, number of securities | investment_security 9 3
Held-to-maturity securities, fair value $ 31,127 $ 16,943
Unrealized Loss $ (838) $ (209)
Total securities, less than 12 months, number of securities | investment_security 313 186
Total securities, less than 12 months, fair value $ 593,442 $ 330,813
Total securities, less than 12 months, gross unrealized holding losses $ (12,956) $ (2,292)
Total securities, 12 months or longer, number of securities | investment_security 88 77
Total securities, 12 months or longer, fair value $ 150,077 $ 146,937
Total securities, 12 months or longer, gross unrealized holding losses $ (7,098) $ (3,432)
Total securities, number of securities | investment_security 401 263
Total securities, fair value $ 743,519 $ 477,750
Total securities, gross unrealized holding losses $ (20,054) $ (5,724)
Agency    
Less than 12 Months    
Number | investment_security 19 6
Fair Value $ 39,828 $ 13,754
Gross Unrealized Holding Losses $ (471) $ (78)
12 Months or Longer    
Number | investment_security 1 0
Fair Value $ 1,249 $ 0
Gross Unrealized Holding Losses $ (19) $ 0
Total    
Number | investment_security 20 6
Fair Value $ 41,077 $ 13,754
Gross Unrealized Holding Losses $ (490) $ (78)
Corporate    
Less than 12 Months    
Number | investment_security 16 4
Fair Value $ 48,326 $ 10,079
Gross Unrealized Holding Losses $ (880) $ (64)
12 Months or Longer    
Number | investment_security 2 2
Fair Value $ 6,014 $ 6,076
Gross Unrealized Holding Losses $ (177) $ (130)
Total    
Number | investment_security 18 6
Fair Value $ 54,340 $ 16,155
Gross Unrealized Holding Losses $ (1,057) $ (194)
Municipal bonds    
Less than 12 Months    
Number | investment_security 163 103
Fair Value $ 116,648 $ 61,313
Gross Unrealized Holding Losses $ (2,070) $ (268)
12 Months or Longer    
Number | investment_security 32 30
Fair Value $ 16,019 $ 15,658
Gross Unrealized Holding Losses $ (1,116) $ (475)
Total    
Number | investment_security 195 133
Fair Value $ 132,667 $ 76,971
Gross Unrealized Holding Losses $ (3,186) $ (743)
Collateralized mortgage obligation: residential    
Less than 12 Months    
Number | investment_security 7 5
Fair Value $ 14,762 $ 13,971
Gross Unrealized Holding Losses $ (400) $ (149)
12 Months or Longer    
Number | investment_security 3 3
Fair Value $ 7,658 $ 8,943
Gross Unrealized Holding Losses $ (270) $ (186)
Total    
Number | investment_security 10 8
Fair Value $ 22,420 $ 22,914
Gross Unrealized Holding Losses $ (670) $ (335)
Mortgage-backed securities: residential    
Less than 12 Months    
Number | investment_security 100 66
Fair Value $ 348,704 $ 220,951
Gross Unrealized Holding Losses $ (8,550) $ (1,600)
12 Months or Longer    
Number | investment_security 49 41
Fair Value $ 113,184 $ 110,062
Gross Unrealized Holding Losses $ (5,263) $ (2,565)
Total    
Number | investment_security 149 107
Fair Value $ 461,888 $ 331,013
Gross Unrealized Holding Losses $ (13,813) $ (4,165)
Held-to-maturity, less than 12 months, number of securities | investment_security 2 2
Held-to-maturity, less than 12 months, fair value $ 1,111 $ 10,745
Held-to-maturity, less than 12 months, gross unrealized holding losses $ 0 $ (133)
Held-to-maturity, 12 months or longer, number of securities | investment_security 0 1
Held-to-maturity, 12 months or longer, fair value $ 0 $ 6,198
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ 0 $ (76)
Held-to-maturity, number of securities | investment_security 2 3
Held-to-maturity securities, fair value $ 1,111 $ 16,943
Unrealized Loss $ 0 $ (209)
Other    
Total    
Held-to-maturity, less than 12 months, number of securities | investment_security 6  
Held-to-maturity, less than 12 months, fair value $ 24,063  
Held-to-maturity, less than 12 months, gross unrealized holding losses $ (585)  
Held-to-maturity, 12 months or longer, number of securities | investment_security 1  
Held-to-maturity, 12 months or longer, fair value $ 5,953  
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ (253)  
Held-to-maturity, number of securities | investment_security 7  
Held-to-maturity securities, fair value $ 30,016  
Unrealized Loss $ (838)