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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Significant Accounting Policies details [Line Items] |  |  |  |
Charge off threshold for unsecured commercial loans considered uncollectible |  |  | 90 days |
Charge off threshold for closed-end consumer loans and uncollectible loans |  |  | 120 days |
Number of monthly payments before loan charge off |  |  | 5 |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Securities gains (losses) | $ (8) | $ 819 | $ (8) | $ 819
Tax (benefit) expense | 5,026 | 5,503 | 10,465 | 10,917
Net income | 11,942 | 12,232 | 23,762 | 24,101
Unrealized Gain (Losses ) on AFS Securities [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Securities gains (losses) | (8) | 819 | (8) | 819
Tax (benefit) expense | (3) | 315 | (3) | 315
Net income | $ (5) | $ 504 | $ (5) | $ 504
Minimum [Member] |  |  |  |
Significant Accounting Policies details [Line Items] |  |  |  |
Historical loan loss review period (in quarters) |  |  | 4 |
Other real estate owned frequency of period reviews |  |  | 24 months |
Maximum [Member] |  |  |  |
Significant Accounting Policies details [Line Items] |  |  |  |
Historical loan loss review period (in quarters) |  |  | 8 |
Other real estate owned frequency of period reviews |  |  | 12 months |

X
- Definition The maximum number of days that a closed-end loan (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) may be delinquent before being charged-off. If a loan is considered uncollectable, it is charged off earlier. + References No definition available. + Details
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- Definition The maximum number of payments that a closed-end loan (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) may be delinquent before being charged-off. If a loan is considered uncollectable, it is charged off earlier. + References No definition available. + Details
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- Definition Number of days for unsecured commercial loans considered to be uncollectible before they are written off. + References No definition available. + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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