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Fair Value Accounting and Measurement (Tables) | 9 Months Ended
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Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Financial Assets And Liabilities Accounted For Fair Value On Recurring Basis | The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at September 30, 2015 and December 31, 2014 by level within the fair value hierarchy. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
|  | Fair value |  | Fair Value Measurements at Reporting Date Using
|  | Level 1 |  | Level 2 |  | Level 3
September 30, 2015 |  | (in thousands)
Assets |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,164,532 |  |  | $ | — |  |  | $ | 1,164,532 |  |  | $ | — |
State and municipal debt securities |  | 489,469 |  |  | — |  |  | 489,469 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 347,856 |  |  | — |  |  | 347,856 |  |  | — |
U.S. government securities |  | 20,400 |  |  | 20,400 |  |  | — |  |  | — |
Other securities |  | 5,167 |  |  | — |  |  | 5,167 |  |  | — |
Total securities available for sale |  | $ | 2,027,424 |  |  | $ | 20,400 |  |  | $ | 2,007,024 |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 14,548 |  |  | $ | — |  |  | $ | 14,548 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 14,602 |  |  | $ | — |  |  | $ | 14,602 |  |  | $ | — |
|  | Fair value |  | Fair Value Measurements at Reporting Date Using
|  | Level 1 |  | Level 2 |  | Level 3
December 31, 2014 |  | (in thousands)
Assets |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,162,387 |  |  | $ | — |  |  | $ | 1,162,387 |  |  | $ | — |
State and municipal debt securities |  | 496,484 |  |  | — |  |  | 496,484 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 413,706 |  |  | — |  |  | 413,706 |  |  | — |
U.S. government securities |  | 20,499 |  |  | 20,499 |  |  | — |  |  | — |
Other securities |  | 5,181 |  |  | — |  |  | 5,181 |  |  | — |
Total securities available for sale |  | $ | 2,098,257 |  |  | $ | 20,499 |  |  | $ | 2,077,758 |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 11,800 |  |  | $ | — |  |  | $ | 11,800 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 11,851 |  |  | $ | — |  |  | $ | 11,851 |  |  | $ | — |
Financial Assets Accounted For Fair Value On Nonrecurring Basis | The following tables set forth information related to the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the current and prior year quarterly periods:
|  | Fair value at September 30, 2015 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Three Months Ended September 30, 2015 |  | Losses During the Nine Months Ended September 30, 2015
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 350 |  |  | $ | — |  |  | $ | — |  |  | $ | 350 |  |  | $ | (1,012 | ) |  | $ | (1,012 | )
OREO |  | 3,286 |  |  | — |  |  | — |  |  | 3,286 |  |  | (646 | ) |  | (662 | )
|  | $ | 3,636 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,636 |  |  | $ | (1,658 | ) |  | $ | (1,674 | )
|  | Fair value at September 30, 2014 |  | Fair Value Measurements at Reporting Date Using |  | Gains (Losses) During the Three Months Ended September 30, 2014 |  | Losses During the Nine Months Ended September 30, 2014
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 2,998 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,998 |  |  | $ | 69 |  |  | $ | (14 | )
OREO (1) |  | 2,950 |  |  | — |  |  | — |  |  | 2,950 |  |  | (388 | ) |  | (388 | )
|  | $ | 5,948 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,948 |  |  | $ | (319 | ) |  | $ | (402 | )
Fair Value, by Balance Sheet Grouping | The following tables summarize carrying amounts and estimated fair values of selected financial instruments as well as assumptions used by the Company in estimating fair value at September 30, 2015 and December 31, 2014:
|  | September 30, 2015
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 149,610 |  |  | $ | 149,610 |  |  | $ | 149,610 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 22,578 |  |  | 22,578 |  |  | 22,578 |  |  | — |  |  | — |
Securities available for sale |  | 2,027,424 |  |  | 2,027,424 |  |  | 20,400 |  |  | 2,007,024 |  |  | — |
FHLB stock |  | 10,242 |  |  | 10,242 |  |  | — |  |  | 10,242 |  |  | — |
Loans held for sale |  | 6,637 |  |  | 6,637 |  |  | — |  |  | 6,637 |  |  | — |
Loans |  | 5,677,462 |  |  | 5,783,474 |  |  | — |  |  | — |  |  | 5,783,474 |
FDIC loss-sharing asset |  | 8,146 |  |  | 2,140 |  |  | — |  |  | — |  |  | 2,140 |
Interest rate contracts |  | 14,548 |  |  | 14,548 |  |  | — |  |  | 14,548 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 7,314,805 |  |  | $ | 7,312,329 |  |  | $ | 6,844,014 |  |  | $ | 468,315 |  |  | $ | — |
FHLB Advances |  | 6,540 |  |  | 7,198 |  |  | — |  |  | 7,198 |  |  | — |
Repurchase agreements |  | 73,182 |  |  | 74,046 |  |  | — |  |  | 74,046 |  |  | — |
Interest rate contracts |  | 14,602 |  |  | 14,602 |  |  | — |  |  | 14,602 |  |  | — |
|  | December 31, 2014
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 171,221 |  |  | $ | 171,221 |  |  | $ | 171,221 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 16,949 |  |  | 16,949 |  |  | 16,949 |  |  | — |  |  | — |
Securities available for sale |  | 2,098,257 |  |  | 2,098,257 |  |  | 20,499 |  |  | 2,077,758 |  |  | — |
FHLB stock |  | 33,365 |  |  | 33,365 |  |  | — |  |  | 33,365 |  |  | — |
Loans held for sale |  | 1,116 |  |  | 1,116 |  |  | — |  |  | 1,116 |  |  | — |
Loans |  | 5,375,809 |  |  | 5,516,286 |  |  | — |  |  | — |  |  | 5,516,286 |
FDIC loss-sharing asset |  | 15,174 |  |  | 4,054 |  |  | — |  |  | — |  |  | 4,054 |
Interest rate contracts |  | 11,800 |  |  | 11,800 |  |  | — |  |  | 11,800 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 6,924,722 |  |  | $ | 6,921,804 |  |  | $ | 6,416,017 |  |  | $ | 505,787 |  |  | $ | — |
FHLB Advances |  | 216,568 |  |  | 217,296 |  |  | — |  |  | 217,296 |  |  | — |
Repurchase agreements |  | 105,080 |  |  | 106,171 |  |  | — |  |  | 106,171 |  |  | — |
Other borrowings |  | 8,248 |  |  | 8,248 |  |  | — |  |  | 8,248 |  |  | — |
Interest rate contracts |  | 11,851 |  |  | 11,851 |  |  | — |  |  | 11,851 |  |  | — |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Inputs, Assets, Quantitative Information | The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets, along with the valuation techniques used, are shown in the following table:
|  | Fair value at September 30, 2015 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans |  | $ | 350 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
OREO |  | 3,286 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
(2) Quantitative disclosures are not provided for impaired loans and OREO because there were no adjustments made to the appraisal value during the current period.
|  | Fair value at September 30, 2014 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans - real estate collateral |  | $ | 534 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
Impaired loans - other collateral (3) |  | 2,464 |  |  | Fair Market Value of Collateral |  | Adjustment to Stated value |  | 0% - 71% (49%)
OREO |  | 2,950 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount applied to appraisal value, letter of intent to purchase, or stated value (in the case of accounts receivable, inventory and equipment).
(2) Quantitative disclosures are not provided for impaired loans collateralized by real estate and OREO because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of accounts receivable, inventory and equipment.

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