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Derivatives and Hedging Activities - Schedule of Master Netting Arrangements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets |  |
Gross Amounts Recognized | $ 8,800 | $ 2,700
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts in the Balance Sheet | 8,800 | 2,700
Financial Instruments | 2,400 | 500
Fair Value of Financial Collateral in the Balance Sheet | 0 | 0
Net Amount | 6,400 | 2,200
Offsetting Derivative Liabilities [Abstract] |  |
Gross Amounts Recognized | 7,900 | 1,300
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts in the Balance Sheet | 7,900 | 1,300
Financial Instruments | 2,400 | 500
Fair Value of Financial Collateral in the Balance Sheet | 3,300 | 0
Net Amount | 2,200 | 800
Repurchase agreements |  |
Gross Amounts Recognized | 643,000 | 537,600
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts in the Balance Sheet | 642,961 | 537,556
Financial Instruments | 0 | 0
Fair Value of Financial Collateral in the Balance Sheet | 643,000 | 537,600
Net Amount | 0 | 0
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Gross Amounts Recognized | 650,900 | 538,900
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts in the Balance Sheet | 650,900 | 538,900
Financial Instruments | 2,400 | 500
Fair Value of Financial Collateral in the Balance Sheet | 646,300 | 537,600
Net Amount | 2,200 | 800
Interest rate swap contracts |  |
Financial Assets |  |
Gross Amounts Recognized | 7,500 | 1,300
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts in the Balance Sheet | 7,500 | 1,300
Financial Instruments | 2,400 | 500
Fair Value of Financial Collateral in the Balance Sheet | 0 | 0
Net Amount | 5,100 | 800
Offsetting Derivative Liabilities [Abstract] |  |
Gross Amounts Recognized | 7,800 | 1,300
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts in the Balance Sheet | 7,800 | 1,300
Financial Instruments | 2,400 | 500
Fair Value of Financial Collateral in the Balance Sheet | 3,300 | 0
Net Amount | 2,100 | 800
Mortgage related derivatives |  |
Financial Assets |  |
Gross Amounts Recognized | 1,300 | 1,400
Gross Amounts Offset in the Balance Sheet | 0 | 0
Net Amounts in the Balance Sheet | 1,300 | 1,400
Financial Instruments | 0 | 0
Fair Value of Financial Collateral in the Balance Sheet | 0 | 0
Net Amount | 1,300 | $ 1,400
Offsetting Derivative Liabilities [Abstract] |  |
Gross Amounts Recognized | 100 |
Gross Amounts Offset in the Balance Sheet | 0 |
Net Amounts in the Balance Sheet | 100 |
Financial Instruments | 0 |
Fair Value of Financial Collateral in the Balance Sheet | 0 |
Net Amount | $ 100 |

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