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Loans and Allowance for Loan Losses (Credit Quality Indicators of Various Classes of Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 15,978,124 | $ 15,703,314 | $ 13,924,386
Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 15,567,288 | 15,258,587 | 12,920,530
Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 211,620 | 241,430 | 765,324
FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 199,216 | 203,297 | 238,532
Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,145,406 | 6,995,824 | 5,987,084
Commercial Non-Real Estate [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,088,146 | 6,930,453 | 5,861,887
Commercial Non-Real Estate [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 51,949 | 59,843 | 118,260
Commercial Non-Real Estate [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,311 | 5,528 | 6,937
Commercial Non-Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,942,564 | 6,260,863 |
Commercial Non-Real Estate [Member] | Pass [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,895,649 | 6,205,372 |
Commercial Non-Real Estate [Member] | Pass [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 44,847 | 53,381 |
Commercial Non-Real Estate [Member] | Pass [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,068 | 2,110 |
Commercial Non-Real Estate [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 298,909 | 168,589 |
Commercial Non-Real Estate [Member] | Pass-Watch [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 298,176 | 167,720 |
Commercial Non-Real Estate [Member] | Pass-Watch [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 733 | 869 |
Commercial Non-Real Estate [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 208,733 | 211,230 |
Commercial Non-Real Estate [Member] | Special Mention [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 208,731 | 211,230 |
Commercial Non-Real Estate [Member] | Special Mention [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2 |  |
Commercial Non-Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 693,059 | 355,098 |
Commercial Non-Real Estate [Member] | Substandard [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 683,449 | 346,087 |
Commercial Non-Real Estate [Member] | Substandard [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 7,100 | 6,462 |
Commercial Non-Real Estate [Member] | Substandard [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,510 | 2,549 |
Commercial Non-Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,141 | 44 |
Commercial Non-Real Estate [Member] | Doubtful [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,141 | 44 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,676,092 | 3,412,551 | 3,150,103
Commercial Real Estate [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,504,803 | 3,220,509 | 2,492,351
Commercial Real Estate [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 156,285 | 176,460 | 629,975
Commercial Real Estate [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 15,004 | 15,582 | 27,777
Commercial Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,433,845 | 3,221,209 |
Commercial Real Estate [Member] | Pass [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,293,852 | 3,058,342 |
Commercial Real Estate [Member] | Pass [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 136,879 | 159,750 |
Commercial Real Estate [Member] | Pass [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,114 | 3,117 |
Commercial Real Estate [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 64,512 | 46,481 |
Commercial Real Estate [Member] | Pass-Watch [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 60,595 | 41,830 |
Commercial Real Estate [Member] | Pass-Watch [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,684 | 2,355 |
Commercial Real Estate [Member] | Pass-Watch [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,233 | 2,296 |
Commercial Real Estate [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 48,117 | 47,052 |
Commercial Real Estate [Member] | Special Mention [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 42,170 | 40,576 |
Commercial Real Estate [Member] | Special Mention [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 4,804 | 5,112 |
Commercial Real Estate [Member] | Special Mention [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,143 | 1,364 |
Commercial Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 129,603 | 97,793 |
Commercial Real Estate [Member] | Substandard [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 108,171 | 79,745 |
Commercial Real Estate [Member] | Substandard [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 12,918 | 9,243 |
Commercial Real Estate [Member] | Substandard [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 8,514 | 8,805 |
Commercial Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 15 | 16 |
Commercial Real Estate [Member] | Doubtful [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 15 | 16 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,000,967 | 2,049,524 | 1,913,885
Residential Mortgages [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,839,889 | 1,887,256 | 1,736,033
Residential Mortgages [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,116 | 27 | 2,485
Residential Mortgages [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 159,962 | 162,241 | 175,367
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,060,245 | 2,093,465 | 1,759,804
Consumer [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,048,068 | 2,080,626 | 1,742,810
Consumer [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 20 | 20 | 25
Consumer [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 12,157 | 12,819 | 16,969
Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,095,414 | 1,151,950 | 1,113,510
Construction and Land Development [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,086,382 | 1,139,743 | 1,087,449
Construction and Land Development [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,250 | 5,080 | 14,579
Construction and Land Development [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 6,782 | 7,127 | $ 11,482
Construction and Land Development [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,039,139 | 1,095,296 |
Construction and Land Development [Member] | Pass [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,036,847 | 1,092,299 |
Construction and Land Development [Member] | Pass [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 837 | 910 |
Construction and Land Development [Member] | Pass [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,455 | 2,087 |
Construction and Land Development [Member] | Pass-Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 24,982 | 6,841 |
Construction and Land Development [Member] | Pass-Watch [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 22,947 | 5,709 |
Construction and Land Development [Member] | Pass-Watch [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 150 | 223 |
Construction and Land Development [Member] | Pass-Watch [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,885 | 909 |
Construction and Land Development [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 613 | 12,297 |
Construction and Land Development [Member] | Special Mention [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 592 | 12,017 |
Construction and Land Development [Member] | Special Mention [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 21 | 280 |
Construction and Land Development [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 30,680 | 37,516 |
Construction and Land Development [Member] | Substandard [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 25,996 | 29,718 |
Construction and Land Development [Member] | Substandard [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,263 | 3,947 |
Construction and Land Development [Member] | Substandard [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,421 | 3,851 |
Performing [Member] | Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,977,131 | 2,025,563 |
Performing [Member] | Residential Mortgages [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,816,053 | 1,863,295 |
Performing [Member] | Residential Mortgages [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,116 | 27 |
Performing [Member] | Residential Mortgages [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 159,962 | 162,241 |
Performing [Member] | Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,050,609 | 2,082,238 |
Performing [Member] | Consumer [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,038,432 | 2,069,399 |
Performing [Member] | Consumer [Member] | Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 20 | 20 |
Performing [Member] | Consumer [Member] | FDIC Acquired Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 12,157 | 12,819 |
Nonperforming [Member] | Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 23,836 | 23,961 |
Nonperforming [Member] | Residential Mortgages [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 23,836 | 23,961 |
Nonperforming [Member] | Consumer [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 9,636 | 11,227 |
Nonperforming [Member] | Consumer [Member] | Originated Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 9,636 | $ 11,227 |

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