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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) contract agreement | Mar. 31, 2015 contract | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carryover of related allowance for loan losses | $ 0 |  |
Number of loss share agreements | agreement | 2 |  |
Nonaccrual loans | $ 237,303 |  | $ 159,713
TDRs both accruing and nonaccruing | $ 63,900 |  | 13,100
Number of TDRs subsequently defaulted | contract | 0 | 0 |
TDRs and loans impaired with minimum aggregate relationship balances | $ 1,000 |  |
Real estate acquired through foreclosure | $ 23,191 |  | 26,256
Performing [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Period for which payments of principal and interest are past due | less than 90 days |  |
Troubled Debt Restructurings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 18,300 |  | 8,800
Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 234,395 |  | $ 156,721
FDIC Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  |  |
Commercial Non-Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 165,930 |  | $ 88,743
Commercial Non-Real Estate [Member] | Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 165,930 |  | $ 88,743
Commercial Non-Real Estate [Member] | FDIC Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  |  |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 22,125 |  | $ 20,816
Commercial Real Estate [Member] | Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 19,217 |  | $ 17,824
Commercial Real Estate [Member] | FDIC Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  |  |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 8,538 |  | $ 9,061
Mortgage loan in process of foreclosure | 6,000 |  | 7,400
Real estate acquired through foreclosure | 5,900 |  | 9,300
Consumer [Member] | Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 8,538 |  | $ 9,061
Consumer [Member] | FDIC Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans |  |  |
Mortgage loan in process of foreclosure | $ 4,000 |  | $ 4,100
Real estate acquired through foreclosure | $ 1,100 |  | $ 1,600

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