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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 USD ($) contract agreement | Jun. 30, 2015 USD ($) contract | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 265,722 |  | $ 159,713
TDRs both accruing and nonaccruing | $ 70,800 |  | 13,100
Number of TDRs subsequently defaulted | contract | 0 | 0 |
TDRs and loans impaired with minimum aggregate relationship balances | $ 1,000 |  |
Total loans | 16,035,796 | $ 14,344,752 | 15,703,314
Real estate acquired through foreclosure | $ 22,641 |  | 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 | $ 34,800 |  | 8,800
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 | $ 8,541 |  | 9,061
Total loans | 2,064,368 | $ 1,869,451 | 2,093,465
Real estate in process of foreclosure | 7,100 |  | 7,400
Real estate acquired through foreclosure | 5,900 |  | 9,300
Consumer [Member] | Performing [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 2,055,003 |  | 2,082,238
Consumer [Member] | FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Real estate in process of foreclosure | 3,600 |  | 4,100
Real estate acquired through foreclosure | $ 700 |  | 1,600
Non-Single Family [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 [Member] | FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 160,000 |  | $ 170,100

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- Definition Includes any additional disclosures related to the credit quality of financing receivables. This may include a description of a credit quality indicator or a description of how the internal risk ratings used by a company relate to the likelihood of loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953659-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953664-111524 + Details
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