Investment Securities (Details) - USD ($)
$ in Thousands |
3 Months Ended |
|
Mar. 31, 2016 |
Mar. 31, 2015 |
Dec. 31, 2015 |
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
$ 787,062
|
|
$ 781,232
|
| Gross Unrealized Gains |
15,817
|
|
13,955
|
| Gross Unrealized Losses |
(929)
|
|
(3,460)
|
| Investment securities, available-for-sale |
801,950
|
|
791,727
|
| Contractual maturities of investments in debt securities available-for-sale, Amortized Cost |
|
|
|
| Due in one year or less |
144,949
|
|
|
| Due after one year through five years |
384,483
|
|
|
| Due after five years through ten years |
18,503
|
|
|
| Due after ten years |
0
|
|
|
| Mortgage-backed securities |
237,234
|
|
|
| Total debt securities available-for-sale |
785,169
|
|
|
| Contractual maturities of investments in debt securities available-for-sale, Fair Value |
|
|
|
| Due in one year or less |
145,669
|
|
|
| Due after one year through five years |
389,225
|
|
|
| Due after five years through ten years |
18,869
|
|
|
| Due after ten years |
0
|
|
|
| Mortgage-backed securities |
240,923
|
|
|
| Total debt securities available-for-sale |
794,686
|
|
|
| Other-than-temporary-impairment (OTTI) write-downs |
0
|
$ 0
|
|
| Gross realized gains and losses |
|
|
|
| Gross realized gains |
10
|
0
|
|
| Gross realized losses |
0
|
0
|
|
| Net realized gains (losses) |
10
|
$ 0
|
|
| U.S. Treasury and Federal agencies securities |
|
|
|
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
391,488
|
|
389,457
|
| Gross Unrealized Gains |
2,624
|
|
1,718
|
| Gross Unrealized Losses |
(42)
|
|
(1,506)
|
| Investment securities, available-for-sale |
394,070
|
|
389,669
|
| U.S. States and political subdivisions securities |
|
|
|
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
121,464
|
|
120,441
|
| Gross Unrealized Gains |
2,968
|
|
2,692
|
| Gross Unrealized Losses |
(123)
|
|
(143)
|
| Investment securities, available-for-sale |
124,309
|
|
122,990
|
| Mortgage-backed securities - Federal agencies |
|
|
|
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
237,234
|
|
234,400
|
| Gross Unrealized Gains |
4,153
|
|
3,430
|
| Gross Unrealized Losses |
(464)
|
|
(1,533)
|
| Investment securities, available-for-sale |
240,923
|
|
236,297
|
| Corporate debt securities |
|
|
|
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
34,183
|
|
34,241
|
| Gross Unrealized Gains |
393
|
|
199
|
| Gross Unrealized Losses |
(1)
|
|
(57)
|
| Investment securities, available-for-sale |
34,575
|
|
34,383
|
| Foreign government and other securities |
|
|
|
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
800
|
|
800
|
| Gross Unrealized Gains |
9
|
|
10
|
| Gross Unrealized Losses |
0
|
|
(1)
|
| Investment securities, available-for-sale |
809
|
|
809
|
| Total debt securities |
|
|
|
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
785,169
|
|
779,339
|
| Gross Unrealized Gains |
10,147
|
|
8,049
|
| Gross Unrealized Losses |
(630)
|
|
(3,240)
|
| Investment securities, available-for-sale |
794,686
|
|
784,148
|
| Marketable equity securities |
|
|
|
| Investment Securities |
|
|
|
| Total investment securities available-for-sale, Amortized Cost |
1,893
|
|
1,893
|
| Gross Unrealized Gains |
5,670
|
|
5,906
|
| Gross Unrealized Losses |
(299)
|
|
(220)
|
| Investment securities, available-for-sale |
$ 7,264
|
|
$ 7,579
|