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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 81.20% | 69.50%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 299,271 | $ 241,239
12 months or more | 189,475 | 173,642
Total | 488,746 | 414,881
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (5,187) | (2,004)
12 months or more | (7,167) | (5,054)
Total | (12,354) | (7,058)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 294,084 | 239,235
12 months or more | 182,308 | 168,588
Total | 476,392 | 407,823
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 170,250 | 136,688
12 months or more | 44,226 | 23,885
Total | 214,476 | 160,573
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,091) | (840)
12 months or more | (790) | (332)
Total | (2,881) | (1,172)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 168,159 | 135,848
12 months or more | 43,436 | 23,553
Total | 211,595 | 159,401
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 55,441 | 34,283
12 months or more | 18,219 | 16,930
Total | 73,660 | 51,213
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,492) | (416)
12 months or more | (1,522) | (745)
Total | (3,014) | (1,161)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 53,949 | 33,867
12 months or more | 16,697 | 16,185
Total | 70,646 | 50,052
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 73,073 | 62,768
12 months or more | 127,030 | 117,827
Total | 200,103 | 180,595
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,599) | (643)
12 months or more | (4,855) | (3,364)
Total | (6,454) | (4,007)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 71,474 | 62,125
12 months or more | 122,175 | 114,463
Total | 193,649 | 176,588
Other Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 507 |
12 months or more | 0 |
Total | 507 |
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (5) |
12 months or more | 0 |
Total | (5) |
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 502 |
12 months or more | 0 |
Total | $ 502 |
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months |  | 233,739
12 months or more |  | 158,642
Total |  | 392,381
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months |  | (1,899)
12 months or more |  | (4,441)
Total |  | (6,340)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months |  | 231,840
12 months or more |  | 154,201
Total |  | 386,041
CRA Investments Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months |  | 7,500
12 months or more |  | 15,000
Total |  | 22,500
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months |  | (105)
12 months or more |  | (613)
Total |  | (718)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months |  | 7,395
12 months or more |  | 14,387
Total |  | $ 21,782

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