Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($)
$ in Thousands |
3 Months Ended |
|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
| AOCI Attributable to Parent, Net of Tax [Roll Forward] |
|
|
|
| Balances at Beginning |
$ 576,202
|
$ 549,405
|
|
| Net current-period other comprehensive income |
(14,386)
|
1,425
|
|
| Balances at Ending |
579,411
|
563,518
|
|
| Available-for-Sale Securities |
|
|
|
| AOCI Attributable to Parent, Net of Tax [Roll Forward] |
|
|
|
| Balances at Beginning |
(13,005)
|
(7,915)
|
|
| Other comprehensive loss before reclassifications |
(14,610)
|
1,197
|
|
| Amounts reclassified from accumulated other comprehensive (loss) income |
(94)
|
0
|
|
| Net current-period other comprehensive income |
(14,704)
|
1,197
|
|
| Adoption of ASU 2016-01 |
|
|
$ 65
|
| Balances at Ending |
(27,644)
|
(6,718)
|
|
| Employee Benefit Plans |
|
|
|
| AOCI Attributable to Parent, Net of Tax [Roll Forward] |
|
|
|
| Balances at Beginning |
(38,291)
|
(29,194)
|
|
| Other comprehensive loss before reclassifications |
0
|
0
|
|
| Amounts reclassified from accumulated other comprehensive (loss) income |
318
|
228
|
|
| Net current-period other comprehensive income |
318
|
228
|
|
| Balances at Ending |
(37,973)
|
(28,966)
|
|
| Accumulated Other Comprehensive (Loss) Income |
|
|
|
| AOCI Attributable to Parent, Net of Tax [Roll Forward] |
|
|
|
| Balances at Beginning |
(51,296)
|
(37,109)
|
|
| Other comprehensive loss before reclassifications |
(14,610)
|
1,197
|
|
| Amounts reclassified from accumulated other comprehensive (loss) income |
224
|
228
|
|
| Net current-period other comprehensive income |
(14,386)
|
1,425
|
|
| Adoption of ASU 2016-01 |
|
|
$ 65
|
| Balances at Ending |
$ (65,617)
|
$ (35,684)
|
|