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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) contract agreement | Sep. 30, 2015 USD ($) contract | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 302,810 |  | $ 159,713
TDRs both accruing and nonaccruing | 56,300 |  | 13,100
Post-Modification outstanding recorded investment | $ 58,447 | $ 687 |
Number of TDRs subsequently defaulted | contract | 0 | 0 |
TDRs and loans impaired with minimum aggregate relationship balances | $ 1,000 |  |
Real estate acquired through foreclosure | $ 19,097 |  | 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 | $ 48,200 |  | 8,800
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Post-Modification outstanding recorded investment | 43,400 | $ 700 |
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Post-Modification outstanding recorded investment | 14,700 |  |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Post-Modification outstanding recorded investment | $ 400 | 100 |
FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loss share agreements | agreement | 2 |  |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 11,752 |  | 9,061
Post-Modification outstanding recorded investment |  | 20 |
Real estate in process of foreclosure | 9,200 |  | 7,400
Real estate acquired through foreclosure | 4,500 |  | 9,300
Consumer [Member] | FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Real estate in process of foreclosure | 2,800 |  | 4,100
Real estate acquired through foreclosure | $ 900 |  | $ 1,600
Non-Single Family Portfolio [Member] | FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recovery period | 3 years |  |
Percentage of recoveries on reimbursed losses due to FDIC | 80.00% |  |
Single Family Portfolio [Member] | FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans covered by loss share agreement | $ 152,300 | $ 177,500 |

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