Investment Securities - Summary of Amortized Cost and Approximate Fair Values of Investment Securities Available for Sale (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Schedule Of Available For Sale Securities [Line Items] |
|
|
| Available-for-sale, Amortized Cost |
$ 337,245
|
$ 333,268
|
| Available-for-sale, Gross Unrealized Gain |
1,179
|
1,877
|
| Available-for-sale, Gross Unrealized Losses, Less Than 12 Months |
(1,870)
|
(1,596)
|
| Available-for-sale, Gross Unrealized Losses, 12 Months or Longer |
(945)
|
(813)
|
| Available-for-sale, Fair Value |
335,609
|
332,736
|
| U.S. Government Sponsored Securities |
|
|
| Schedule Of Available For Sale Securities [Line Items] |
|
|
| Available-for-sale, Amortized Cost |
119,202
|
104,591
|
| Available-for-sale, Gross Unrealized Gain |
71
|
11
|
| Available-for-sale, Gross Unrealized Losses, Less Than 12 Months |
(669)
|
(612)
|
| Available-for-sale, Gross Unrealized Losses, 12 Months or Longer |
(1)
|
|
| Available-for-sale, Fair Value |
118,603
|
103,990
|
| Mortgage-backed Securities |
|
|
| Schedule Of Available For Sale Securities [Line Items] |
|
|
| Available-for-sale, Amortized Cost |
182,867
|
181,857
|
| Available-for-sale, Gross Unrealized Gain |
679
|
940
|
| Available-for-sale, Gross Unrealized Losses, Less Than 12 Months |
(1,111)
|
(724)
|
| Available-for-sale, Gross Unrealized Losses, 12 Months or Longer |
(614)
|
(687)
|
| Available-for-sale, Fair Value |
181,821
|
181,386
|
| Municipal Securities |
|
|
| Schedule Of Available For Sale Securities [Line Items] |
|
|
| Available-for-sale, Amortized Cost |
25,176
|
36,820
|
| Available-for-sale, Gross Unrealized Gain |
401
|
926
|
| Available-for-sale, Gross Unrealized Losses, Less Than 12 Months |
(58)
|
(7)
|
| Available-for-sale, Gross Unrealized Losses, 12 Months or Longer |
|
(9)
|
| Available-for-sale, Fair Value |
25,519
|
37,730
|
| Corporate Securities |
|
|
| Schedule Of Available For Sale Securities [Line Items] |
|
|
| Available-for-sale, Amortized Cost |
10,000
|
10,000
|
| Available-for-sale, Gross Unrealized Gain |
28
|
|
| Available-for-sale, Gross Unrealized Losses, Less Than 12 Months |
(32)
|
(253)
|
| Available-for-sale, Gross Unrealized Losses, 12 Months or Longer |
(330)
|
(117)
|
| Available-for-sale, Fair Value |
$ 9,666
|
$ 9,630
|