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Investment Securities - Investment Securities in Unrealized Loss Positions (Details) $ in Thousands | Mar. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
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Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Number of investment securities other-than-temporarily impaired | security | 0 |
Number of investment securities in unrealized loss position | security | 106 | 134
Held-to-maturity, less than 12 continuous months, Fair value | $ 109,630 | $ 9,130
Held-to-maturity, less than 12 continuous months, Unrealized loss | (677) | (161)
Held-to-maturity, greater than 12 continuous months, Fair value | 545 | 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss | (2) | 0
Held-to-maturity, Total Securities in a loss position, Fair value | 110,175 | 9,130
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (679) | (161)
Held-to-maturity, Gross Unrealized Losses | (679) | (161)
Available-for-sale, less than 12 continuous months, Fair value | 123,229 | 284,314
Available-for-sale, less than 12 continuous months, Unrealized loss | (1,743) | (6,197)
Available-for-sale, greater than 12 continuous months, Fair value | 9,945 | 9,946
Available-for-sale, greater than 12 continuous months, Unrealized loss | (54) | (52)
Available-for-sale, Total Securities in a loss position, Fair Value | 133,174 | 294,260
Available-for-sale, Total Securities in a loss position, Unrealized loss | (1,797) | (6,249)
Marketable securities, less than 12 continuous months, Fair value | 232,859 | 293,444
Marketable securities, less than 12 continuous months, Unrealized loss | (2,420) | (6,358)
Marketable securities, greater than 12 continuous months, Fair value | 10,490 | 9,946
Marketable securities, greater than 12 continuous months, Unrealized loss | (56) | (52)
Marketable securities, Total Securities in a loss position, Fair value | 243,349 | 303,390
Marketable securities, Total Securities in a loss position, Unrealized loss | $ (2,476) | (6,410)
Number of investment securities in unrealized loss position less than 12 months | security | 104 |
MBS pass-through securities issued by FHLMC and FNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 45,048 | 162,016
Available-for-sale, less than 12 continuous months, Unrealized loss | (285) | (3,577)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 45,048 | 162,016
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (285) | (3,577)
Number of investment securities in unrealized loss position less than 12 months | security | 28 |
CMOs issued by FNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 8,866 | 9,498
Available-for-sale, less than 12 continuous months, Unrealized loss | (107) | (109)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 8,866 | 9,498
Available-for-sale, Total Securities in a loss position, Unrealized loss | (107) | (109)
CMOs issued by FHLMC |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | 6,553 | 31,545
Available-for-sale, less than 12 continuous months, Unrealized loss | (2) | (731)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 6,553 | 31,545
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (2) | (731)
CMOs issued by GNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value |  | 1,583
Available-for-sale, less than 12 continuous months, Unrealized loss |  | (1)
Available-for-sale, greater than 12 continuous months, Fair value |  | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss |  | 0
Available-for-sale, Total Securities in a loss position, Fair Value |  | 1,583
Available-for-sale, Total Securities in a loss position, Unrealized loss |  | (1)
Debentures of government- sponsored agencies |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Marketable Securities In Unrealized Loss Positions, Qualitative Disclosure, Number Of Positions, Longer Than 12 Months | security | 1 |
Available-for-sale, less than 12 continuous months, Fair value | $ 19,940 | 19,951
Available-for-sale, less than 12 continuous months, Unrealized loss | (50) | (38)
Available-for-sale, greater than 12 continuous months, Fair value | 9,945 | 9,946
Available-for-sale, greater than 12 continuous months, Unrealized loss | (54) | (52)
Available-for-sale, Total Securities in a loss position, Fair Value | 29,885 | 29,897
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (104) | (90)
Number of investment securities in unrealized loss position less than 12 months | security | 1 |
Privately issued CMOs |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Number of investment securities in unrealized loss position less than 12 months | security | 8 |
Obligations of state and political subdivisions |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Marketable Securities In Unrealized Loss Positions, Qualitative Disclosure, Number Of Positions, Longer Than 12 Months | security | 1 |
Available-for-sale, less than 12 continuous months, Fair value | $ 41,822 | 59,567
Available-for-sale, less than 12 continuous months, Unrealized loss | (1,299) | (1,740)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 41,822 | 59,567
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (1,299) | (1,740)
Number of investment securities in unrealized loss position less than 12 months | security | 65 |
Corporate bonds |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 1,000 | 154
Available-for-sale, less than 12 continuous months, Unrealized loss | 0 | (1)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 1,000 | 154
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ 0 | (1)
Number of investment securities in unrealized loss position less than 12 months | security | 2 |
Obligations of state and political subdivisions |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 continuous months, Fair value | $ 1,493 | 2,250
Held-to-maturity, less than 12 continuous months, Unrealized loss | (1) | (154)
Held-to-maturity, greater than 12 continuous months, Fair value | 545 | 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss | (2) | 0
Held-to-maturity, Total Securities in a loss position, Fair value | 2,038 | 2,250
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (3) | (6)
Held-to-maturity, Gross Unrealized Losses | (3) | (154)
Corporate bonds |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 continuous months, Fair value | 3,512 | 3,362
Held-to-maturity, less than 12 continuous months, Unrealized loss | (3) | (6)
Held-to-maturity, greater than 12 continuous months, Fair value | 0 | 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss | 0 | 0
Held-to-maturity, Total Securities in a loss position, Fair value | 3,512 | 3,362
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (3) | (1)
Held-to-maturity, Gross Unrealized Losses | (3) | (6)
MBS pass-through securities issued by FHLMC and FNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 continuous months, Fair value | 93,021 | 3,518
Held-to-maturity, less than 12 continuous months, Unrealized loss | (623) | (1)
Held-to-maturity, greater than 12 continuous months, Fair value | 0 | 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss | 0 | 0
Held-to-maturity, Total Securities in a loss position, Fair value | 93,021 | 3,518
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (623) | (154)
Held-to-maturity, Gross Unrealized Losses |  | (1)
CMOs issued by FHLMC |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 continuous months, Fair value | 11,604 |
Held-to-maturity, less than 12 continuous months, Unrealized loss | (50) |
Held-to-maturity, greater than 12 continuous months, Fair value | 0 |
Held-to-maturity, greater than 12 continuous months, Unrealized loss | 0 |
Held-to-maturity, Total Securities in a loss position, Fair value | 11,604 |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | $ (50) | $ 0

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