Derivatives - Schedule of gross and net amounts of derivative instruments that are subject to enforceable master netting arrangements or similar agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Offsettting Assets and Liabilities [Line Items]
OTC Option Asset	$ 8,900	$ 3,800
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	35,337	21,130
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	15,392	11,015
OTC Option Liability	3,700	2,800
Counterparty 1
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		11
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	2,626	1,613
Financial Instruments	2,171	1,613
Cash Collateral Received	455	0
Net Amount	0	0
Counterparty 2
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		1,660
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	1,243	539
Financial Instruments	1,243	539
Cash Collateral Received	0	0
Net Amount	0	0
Counterparty 3
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		5,756
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	2,335	4,802
Financial Instruments	2,335	4,802
Cash Collateral Received	0	0
Net Amount	0	0
Counterparty 4
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		0
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	2,816	932
Financial Instruments	2,656	368
Cash Collateral Received	160	564
Net Amount	0	0
Counterparty 5
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		2,085
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	4,028	133
Financial Instruments	4,028	133
Cash Collateral Received	0	0
Net Amount	0	0
Counterparty 6
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		546
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	1,657	2,866
Financial Instruments	1,657	2,866
Cash Collateral Received	0	0
Net Amount	0	0
Counterparty 7
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		305
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	0	440
Financial Instruments	0	440
Cash Collateral Received	0	0
Net Amount	0	0
Counterparty 8
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		0
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	3,659	2,001
Financial Instruments	2,669	699
Cash Collateral Received	0	1,302
Net Amount	990	0
Counterparty 9
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		194
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	542	461
Financial Instruments	542	461
Cash Collateral Received	0	0
Net Amount	0	0
Counterparty 10
Gross Amounts not Offset in the Consolidated Balance Sheet
Net Amount		23
Counterparty 15
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	153
Financial Instruments	6
Cash Collateral Received	147
Net Amount	0
1 derivative not included as counterparty
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	19,059	13,787
Financial Instruments	17,307	11,921
Cash Collateral Received	762	1,866
Net Amount	990	0
Financial assets, derivative assets and collateral received
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	44,248	24,921
Financial Instruments	17,300	11,921
Cash Collateral Received	2,187	2,420
Net Amount	24,761	10,580
Financial assets, derivative assets and collateral received \| Counterparty 1
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	2,171	1,624
Financial Instruments	2,171	1,613
Cash Collateral Received	0	0
Net Amount	0
Financial assets, derivative assets and collateral received \| Counterparty 2
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	4,959	2,199
Financial Instruments	1,243	539
Cash Collateral Received	0	0
Net Amount	3,716
Financial assets, derivative assets and collateral received \| Counterparty 3
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	6,347	10,558
Financial Instruments	2,335	4,802
Cash Collateral Received	0	0
Net Amount	4,012
Financial assets, derivative assets and collateral received \| Counterparty 4
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	3,679	368
Financial Instruments	2,656	368
Cash Collateral Received	0	0
Net Amount	1,023
Financial assets, derivative assets and collateral received \| Counterparty 5
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	14,181	2,218
Financial Instruments	4,027	133
Cash Collateral Received	0	0
Net Amount	10,154
Financial assets, derivative assets and collateral received \| Counterparty 6
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	7,351	5,832
Financial Instruments	1,657	2,866
Cash Collateral Received	1,993	2,420
Net Amount	3,701
Financial assets, derivative assets and collateral received \| Counterparty 7
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	882	745
Financial Instruments	0	440
Cash Collateral Received	194	0
Net Amount	688
Financial assets, derivative assets and collateral received \| Counterparty 8
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	2,669	699
Financial Instruments	2,669	699
Cash Collateral Received	0	0
Net Amount	0
Financial assets, derivative assets and collateral received \| Counterparty 9
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	2,009	655
Financial Instruments	542	461
Cash Collateral Received	0	0
Net Amount	1,467
Financial assets, derivative assets and collateral received \| Counterparty 10
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet		23
Financial Instruments		0
Cash Collateral Received		0
Loaned securities
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	114
Financial Instruments	0
Cash Collateral Received	112
Net Amount	2
Loaned securities \| Counterparty 3
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet	114
Financial Instruments	0
Cash Collateral Received	112
Net Amount	2
Net investment losses on securities sold under an agreement to repurchase \| Counterparty 4
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	8,944
Financial Instruments	8,944
Cash Collateral Received	0
Net investment losses on securities sold under an agreement to repurchase \| 1 derivative not included as counterparty
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Liabilities Presented in the Consolidated Balance Sheet	8,944
Financial Instruments	8,944
Cash Collateral Received	0
Net Amount	$ 0
Securities purchased under an agreement to sell
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet		29,852
Financial Instruments		29,350
Cash Collateral Received		247
Net Amount		255
Securities purchased under an agreement to sell \| Counterparty 11
Gross Amounts not Offset in the Consolidated Balance Sheet
Gross Amounts of Assets Presented in the Consolidated Balance Sheet		29,852
Financial Instruments		29,350
Cash Collateral Received		247
Net Amount		$ 255

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OTC Option Liability

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[Line Items] for Offsettting Assets and Liabilities [Table]

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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