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Investment Securities - Investment Category and Length of Time (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
investment_security
Dec. 31, 2017
USD ($)
investment_security
Less than 12 Months    
Number | investment_security 310 184
Fair Value $ 668,428 $ 320,068
Gross Unrealized Holding Losses $ (12,666) $ (2,159)
12 Months or Longer    
Number | investment_security 133 76
Fair Value $ 243,800 $ 140,739
Gross Unrealized Holding Losses $ (11,907) $ (3,356)
Total    
Number | investment_security 443 260
Fair Value $ 912,228 $ 460,807
Gross Unrealized Holding Losses $ (24,573) $ (5,515)
Held-to-maturity, less than 12 months, number of securities | investment_security 13 2
Held-to-maturity, less than 12 months, fair value $ 33,318 $ 10,745
Held-to-maturity, less than 12 months, gross unrealized holding losses $ (949) $ (133)
Held-to-maturity, 12 months or longer, number of securities | investment_security 1 1
Held-to-maturity, 12 months or longer, fair value $ 5,849 $ 6,198
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ (320) $ (76)
Held-to-maturity, number of securities | investment_security 14 3
Held-to-maturity securities, fair value $ 39,167 $ 16,943
Unrealized Loss $ (1,269) $ (209)
Total securities, less than 12 months, number of securities | investment_security 323 186
Total securities, less than 12 months, fair value $ 701,746 $ 330,813
Total securities, less than 12 months, gross unrealized holding losses $ (13,615) $ (2,292)
Total securities, 12 months or longer, number of securities | investment_security 134 77
Total securities, 12 months or longer, fair value $ 249,649 $ 146,937
Total securities, 12 months or longer, gross unrealized holding losses $ (12,227) $ (3,432)
Total securities, number of securities | investment_security 457 263
Total securities, fair value $ 951,395 $ 477,750
Total securities, gross unrealized holding losses $ (25,842) $ (5,724)
U.S. Treasury    
Less than 12 Months    
Number | investment_security 5  
Fair Value $ 39,925  
Gross Unrealized Holding Losses $ (329)  
12 Months or Longer    
Number | investment_security 0  
Fair Value $ 0  
Gross Unrealized Holding Losses $ 0  
Total    
Number | investment_security 5  
Fair Value $ 39,925  
Gross Unrealized Holding Losses $ (329)  
Agency    
Less than 12 Months    
Number | investment_security 28 6
Fair Value $ 90,499 $ 13,754
Gross Unrealized Holding Losses $ (859) $ (78)
12 Months or Longer    
Number | investment_security 1 0
Fair Value $ 1,121 $ 0
Gross Unrealized Holding Losses $ (18) $ 0
Total    
Number | investment_security 29 6
Fair Value $ 91,620 $ 13,754
Gross Unrealized Holding Losses $ (877) $ (78)
Corporate    
Less than 12 Months    
Number | investment_security 17 4
Fair Value $ 61,221 $ 10,079
Gross Unrealized Holding Losses $ (1,076) $ (64)
12 Months or Longer    
Number | investment_security 4 2
Fair Value $ 8,942 $ 6,076
Gross Unrealized Holding Losses $ (326) $ (130)
Total    
Number | investment_security 21 6
Fair Value $ 70,163 $ 16,155
Gross Unrealized Holding Losses $ (1,402) $ (194)
Municipal bonds    
Less than 12 Months    
Number | investment_security 173 103
Fair Value $ 150,294 $ 61,313
Gross Unrealized Holding Losses $ (2,817) $ (268)
12 Months or Longer    
Number | investment_security 42 30
Fair Value $ 22,161 $ 15,658
Gross Unrealized Holding Losses $ (1,476) $ (475)
Total    
Number | investment_security 215 133
Fair Value $ 172,455 $ 76,971
Gross Unrealized Holding Losses $ (4,293) $ (743)
Collateralized mortgage obligation: residential    
Less than 12 Months    
Number | investment_security 2 5
Fair Value $ 3,023 $ 13,971
Gross Unrealized Holding Losses $ (54) $ (149)
12 Months or Longer    
Number | investment_security 7 3
Fair Value $ 16,537 $ 8,943
Gross Unrealized Holding Losses $ (687) $ (186)
Total    
Number | investment_security 9 8
Fair Value $ 19,560 $ 22,914
Gross Unrealized Holding Losses $ (741) $ (335)
Mortgage-backed securities: residential    
Less than 12 Months    
Number | investment_security 85 66
Fair Value $ 323,466 $ 220,951
Gross Unrealized Holding Losses $ (7,531) $ (1,600)
12 Months or Longer    
Number | investment_security 79 41
Fair Value $ 195,039 $ 110,062
Gross Unrealized Holding Losses $ (9,400) $ (2,565)
Total    
Number | investment_security 164 107
Fair Value $ 518,505 $ 331,013
Gross Unrealized Holding Losses $ (16,931) $ (4,165)
Held-to-maturity, less than 12 months, number of securities | investment_security 13 2
Held-to-maturity, less than 12 months, fair value $ 33,318 $ 10,745
Held-to-maturity, less than 12 months, gross unrealized holding losses $ (949) $ (133)
Held-to-maturity, 12 months or longer, number of securities | investment_security 1 1
Held-to-maturity, 12 months or longer, fair value $ 5,849 $ 6,198
Held-to-maturity, 12 months or longer, gross unrealized holding losses $ (320) $ (76)
Held-to-maturity, number of securities | investment_security 14 3
Held-to-maturity securities, fair value $ 39,167 $ 16,943
Unrealized Loss $ (1,269) $ (209)