Financial Derivatives - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
$ 8,429,964
|
$ 6,837,571
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
3,816
|
4,177
|
| Financial derivatives, at fair value |
77,199
|
84,844
|
| Derivative Credit Risk Valuation Adjustment, Derivative Assets |
200
|
200
|
| Derivative, Collateral [Abstract] |
|
|
| Collateral Pledged |
37,986
|
46,627
|
| Derivative Asset |
3,816
|
4,177
|
| Derivative Liability |
39,213
|
38,217
|
| Cash [Member] |
|
|
| Derivative, Collateral [Abstract] |
|
|
| Obligation to Return Securities Received as Collateral |
0
|
0
|
| Collateral Pledged |
38,000
|
46,600
|
| Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swap, Pay Fixed Non-Callable [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
1,276,285
|
1,000,000
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
949
|
0
|
| Financial derivatives, at fair value |
$ 26,703
|
$ 31,718
|
| Derivative, Average Fixed Interest Rate |
2.35%
|
2.47%
|
| Derivative, Average Variable Interest Rate |
0.37%
|
0.23%
|
| Derivative, Average Remaining Maturity |
4 years 1 month 28 days
|
3 years 11 months 23 days
|
| Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap, Pay Fixed Non-Callable [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
$ 119,000
|
$ 15,000
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
8
|
0
|
| Financial derivatives, at fair value |
$ 1,381
|
$ 289
|
| Derivative, Average Fixed Interest Rate |
2.25%
|
2.43%
|
| Derivative, Average Variable Interest Rate |
0.64%
|
0.51%
|
| Derivative, Average Remaining Maturity |
7 years 11 days
|
6 years 2 months 23 days
|
| Not Designated as Hedging Instrument [Member] |
|
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Derivative Credit Risk Valuation Adjustment, Derivative Assets |
$ 5
|
$ 22
|
| Derivative Credit Risk Valuation Adjustment, Derivative Liabilities |
170
|
187
|
| Not Designated as Hedging Instrument [Member] | Interest Rate Swap, Pay Fixed Non-Callable [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
454,041
|
490,183
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
229
|
537
|
| Financial derivatives, at fair value |
$ 44,528
|
$ 51,224
|
| Derivative, Average Fixed Interest Rate |
3.73%
|
4.23%
|
| Derivative, Average Variable Interest Rate |
0.33%
|
0.23%
|
| Derivative, Average Remaining Maturity |
6 years 7 days
|
7 years 18 days
|
| Not Designated as Hedging Instrument [Member] | Interest Rate Swap, Receive Fixed Non-Callable [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
$ 5,590,638
|
$ 3,829,355
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
2,384
|
3,414
|
| Financial derivatives, at fair value |
$ 4,205
|
$ 461
|
| Derivative, Average Fixed Interest Rate |
0.47%
|
0.27%
|
| Derivative, Average Variable Interest Rate |
0.31%
|
0.14%
|
| Derivative, Average Remaining Maturity |
6 months 25 days
|
6 months 18 days
|
| Not Designated as Hedging Instrument [Member] | Interest Rate Swap, Receive Fixed Callable [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
$ 230,000
|
$ 383,565
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
0
|
1
|
| Financial derivatives, at fair value |
$ 421
|
$ 877
|
| Derivative, Average Fixed Interest Rate |
0.91%
|
1.34%
|
| Derivative, Average Variable Interest Rate |
0.41%
|
0.12%
|
| Derivative, Average Remaining Maturity |
2 years 3 months 4 days
|
3 years 5 months 19 days
|
| Not Designated as Hedging Instrument [Member] | Basis Swap [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
$ 725,000
|
$ 1,105,000
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
232
|
247
|
| Financial derivatives, at fair value |
$ 131
|
$ 406
|
| Derivative, Average Variable Interest Rate |
0.22%
|
0.11%
|
| Derivative, Variable Interest Rate |
0.38%
|
0.31%
|
| Derivative, Average Remaining Maturity |
2 years 3 months 29 days
|
2 years 5 months 1 day
|
| Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
$ 0
|
$ 12,768
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
0
|
0
|
| Financial derivatives, at fair value |
$ 0
|
$ 53
|
| Derivative, Weighted-Average Forward Price |
$ 0.00
|
$ 101.00
|
| Not Designated as Hedging Instrument [Member] | Future [Member] |
|
|
| Notional Disclosures [Abstract] |
|
|
| Derivative, Notional Amount |
$ 35,000
|
$ 1,700
|
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract] |
|
|
| Financial derivatives, at fair value |
19
|
0
|
| Financial derivatives, at fair value |
$ 0
|
$ 3
|
| Derivative, Weighted-Average Forward Price |
$ 125.96
|
$ 126.60
|