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Fair Value Measurements (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | $ 2,918,185 | $ 2,910,869
Derivative assets |  | 6,751 | 2,148
Derivative liabilities |  | 309 | 3,938
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,918,185 |
Derivative assets |  | 11,411 |
Derivative liabilities |  | 28,791 |
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,918,185 | 2,910,869
Derivative assets | [1] | 11,411 | 14,157
Total recurring fair value measurements - assets |  | 2,929,596 | 2,925,026
Derivative liabilities | [1] | 28,791 | 14,389
Total recurring fair value measurements - liabilities |  | 28,791 | 14,389
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 2,918,185 | 2,910,869
Derivative assets | [1] | 11,411 | 14,157
Total recurring fair value measurements - assets |  | 2,929,596 | 2,925,026
Derivative liabilities | [1] | 28,791 | 14,389
Total recurring fair value measurements - liabilities |  | 28,791 | 14,389
Recurring [Member] | U.S. Treasury and Government Agency Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 89,312 | 97,272
Recurring [Member] | U.S. Treasury and Government Agency Securities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 89,312 | 97,272
Recurring [Member] | Municipal Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 232,713 | 243,786
Recurring [Member] | Municipal Obligations [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 232,713 | 243,786
Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 3,500 | 3,500
Recurring [Member] | Corporate Debt Securities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 3,500 | 3,500
Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 1,731,275 | 1,715,213
Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 1,731,275 | 1,715,213
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 722,882 | 687,135
Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 722,882 | 687,135
Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | 138,503 | 163,963
Recurring [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale securities |  | $ 138,503 | $ 163,963
[1] | For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

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