Investment Securities (Aggregate Unrealized Losses and Aggregate Fair Value of Underlying Securities) (Details) - USD ($)
$ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Securities [Line Items] |
|
|
| Held-to-maturity Securities, Fair Value, Total |
$ 24,685
|
$ 39,756
|
| Held-to-maturity Securities, Unrealized Losses |
(520)
|
(1,491)
|
| Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months |
9,612
|
37,786
|
| Held-to-maturity Securities, Unrealized Loss Less Than 12 Months |
(76)
|
(1,467)
|
| Held-to-maturity Securities, Fair Value Impaired More Than 12 Months |
15,073
|
1,970
|
| Held-to-maturity Securities, Unrealized Loss More Than 12 Months |
(444)
|
(24)
|
| Available-for-sale Securities, Fair Value, Total |
106,999
|
86,544
|
| Available-for-sale Securities, Unrealized Loss, Total |
(1,263)
|
(1,687)
|
| Available-for-sale Securities, Fair Value Impaired Less Than 12 Months |
52,755
|
73,858
|
| Available-for-sale Securities, Unrealized Loss Less Than 12 Months |
(336)
|
(1,313)
|
| Available-for-sale Securities, Fair Value Impaired More Than 12 Months |
54,244
|
12,686
|
| Available-for-sale Securities, Unrealized Loss More Than 12 Months |
(927)
|
(374)
|
| US Government Agency Obligations [Member] |
|
|
| Securities [Line Items] |
|
|
| Available-for-sale Securities, Fair Value, Total |
53,102
|
27,270
|
| Available-for-sale Securities, Unrealized Loss, Total |
(209)
|
(150)
|
| Available-for-sale Securities, Fair Value Impaired Less Than 12 Months |
33,017
|
27,270
|
| Available-for-sale Securities, Unrealized Loss Less Than 12 Months |
(94)
|
(150)
|
| Available-for-sale Securities, Fair Value Impaired More Than 12 Months |
20,085
|
|
| Available-for-sale Securities, Unrealized Loss More Than 12 Months |
(115)
|
|
| Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member] |
|
|
| Securities [Line Items] |
|
|
| Available-for-sale Securities, Fair Value, Total |
29,772
|
29,145
|
| Available-for-sale Securities, Unrealized Loss, Total |
(498)
|
(723)
|
| Available-for-sale Securities, Fair Value Impaired Less Than 12 Months |
12,055
|
29,145
|
| Available-for-sale Securities, Unrealized Loss Less Than 12 Months |
(166)
|
(723)
|
| Available-for-sale Securities, Fair Value Impaired More Than 12 Months |
17,717
|
|
| Available-for-sale Securities, Unrealized Loss More Than 12 Months |
(332)
|
|
| Collateralized Mortgage Obligations GSE [Member] |
|
|
| Securities [Line Items] |
|
|
| Held-to-maturity Securities, Fair Value, Total |
895
|
1,104
|
| Held-to-maturity Securities, Unrealized Losses |
(15)
|
(22)
|
| Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months |
|
1,104
|
| Held-to-maturity Securities, Unrealized Loss Less Than 12 Months |
|
(22)
|
| Held-to-maturity Securities, Fair Value Impaired More Than 12 Months |
895
|
|
| Held-to-maturity Securities, Unrealized Loss More Than 12 Months |
(15)
|
|
| Available-for-sale Securities, Fair Value, Total |
12,308
|
12,116
|
| Available-for-sale Securities, Unrealized Loss, Total |
(370)
|
(387)
|
| Available-for-sale Securities, Fair Value Impaired Less Than 12 Months |
3,730
|
4,868
|
| Available-for-sale Securities, Unrealized Loss Less Than 12 Months |
(58)
|
(94)
|
| Available-for-sale Securities, Fair Value Impaired More Than 12 Months |
8,578
|
7,248
|
| Available-for-sale Securities, Unrealized Loss More Than 12 Months |
(312)
|
(293)
|
| Corporate Bonds [Member] |
|
|
| Securities [Line Items] |
|
|
| Held-to-maturity Securities, Fair Value, Total |
2,492
|
5,962
|
| Held-to-maturity Securities, Unrealized Losses |
(4)
|
(63)
|
| Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months |
2,492
|
3,992
|
| Held-to-maturity Securities, Unrealized Loss Less Than 12 Months |
(4)
|
(39)
|
| Held-to-maturity Securities, Fair Value Impaired More Than 12 Months |
|
1,970
|
| Held-to-maturity Securities, Unrealized Loss More Than 12 Months |
|
(24)
|
| Available-for-sale Securities, Fair Value, Total |
9,895
|
13,031
|
| Available-for-sale Securities, Unrealized Loss, Total |
(114)
|
(299)
|
| Available-for-sale Securities, Fair Value Impaired Less Than 12 Months |
3,660
|
7,593
|
| Available-for-sale Securities, Unrealized Loss Less Than 12 Months |
(17)
|
(218)
|
| Available-for-sale Securities, Fair Value Impaired More Than 12 Months |
6,235
|
5,438
|
| Available-for-sale Securities, Unrealized Loss More Than 12 Months |
(97)
|
(81)
|
| State and Municipal Taxable [Member] |
|
|
| Securities [Line Items] |
|
|
| Held-to-maturity Securities, Fair Value, Total |
989
|
|
| Held-to-maturity Securities, Unrealized Losses |
(18)
|
|
| Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months |
989
|
|
| Held-to-maturity Securities, Unrealized Loss Less Than 12 Months |
(18)
|
|
| State and Municipal Tax-Exempt [Member] |
|
|
| Securities [Line Items] |
|
|
| Held-to-maturity Securities, Fair Value, Total |
20,309
|
32,690
|
| Held-to-maturity Securities, Unrealized Losses |
(483)
|
(1,406)
|
| Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months |
6,131
|
32,690
|
| Held-to-maturity Securities, Unrealized Loss Less Than 12 Months |
(54)
|
(1,406)
|
| Held-to-maturity Securities, Fair Value Impaired More Than 12 Months |
14,178
|
|
| Held-to-maturity Securities, Unrealized Loss More Than 12 Months |
(429)
|
|
| Available-for-sale Securities, Fair Value, Total |
1,922
|
4,956
|
| Available-for-sale Securities, Unrealized Loss, Total |
(72)
|
(128)
|
| Available-for-sale Securities, Fair Value Impaired Less Than 12 Months |
293
|
4,956
|
| Available-for-sale Securities, Unrealized Loss Less Than 12 Months |
(1)
|
(128)
|
| Available-for-sale Securities, Fair Value Impaired More Than 12 Months |
1,629
|
|
| Available-for-sale Securities, Unrealized Loss More Than 12 Months |
$ (71)
|
|
| Asset-Backed Security [Member] |
|
|
| Securities [Line Items] |
|
|
| Available-for-sale Securities, Fair Value, Total |
|
26
|
| Available-for-sale Securities, Fair Value Impaired Less Than 12 Months |
|
$ 26
|