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Fair Value Accounting and Measurement (Tables) | 12 Months Ended
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Dec. 31, 2016
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 December 31, 2016 and 2015 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 at December 31, 2016 |  | Fair Value Measurements at Reporting Date Using
|  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |  |  |
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,465,732 |  |  | $ | — |  |  | $ | 1,465,732 |  |  | $ | — |
State and municipal securities |  | 475,060 |  |  | — |  |  | 475,060 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 331,902 |  |  | — |  |  | 331,902 |  |  | — |
U.S. government securities |  | 800 |  |  | 800 |  |  | — |  |  | — |
Other securities |  | 5,083 |  |  | — |  |  | 5,083 |  |  | — |
Total securities available for sale |  | $ | 2,278,577 |  |  | $ | 800 |  |  | $ | 2,277,777 |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 9,012 |  |  | $ | — |  |  | $ | 9,012 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 9,036 |  |  | $ | — |  |  | $ | 9,036 |  |  | $ | — |
|  | Fair value at December 31, 2015 |  | Fair Value Measurements at Reporting Date Using
|  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |  |  |
U.S. government agency and sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,286,489 |  |  | $ | — |  |  | $ | 1,286,489 |  |  | $ | — |
State and municipal debt securities |  | 492,169 |  |  | — |  |  | 492,169 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 353,782 |  |  | — |  |  | 353,782 |  |  | — |
U.S. government securities |  | 20,137 |  |  | 20,137 |  |  | — |  |  | — |
Other securities |  | 5,117 |  |  | — |  |  | 5,117 |  |  | — |
Total securities available for sale |  | $ | 2,157,694 |  |  | $ | 20,137 |  |  | $ | 2,137,557 |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 12,438 |  |  | $ | — |  |  | $ | 12,438 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 12,478 |  |  | $ | — |  |  | $ | 12,478 |  |  | $ | — |
Financial Assets Accounted For Fair Value On Nonrecurring Basis | The following table sets forth the Company’s assets that were measured using fair value estimates on a nonrecurring basis during the years ended December 31, 2016 and 2015:
|  | Fair value at December 31, 2016 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Year Ended December 31, 2016
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 3,787 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,787 |  |  | $ | 5,413 |
OREO |  | 4,388 |  |  | — |  |  | — |  |  | 4,388 |  |  | 332 |
|  | $ | 8,175 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,175 |  |  | $ | 5,745 |
|  | Fair value at December 31, 2015 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Year Ended December 31, 2015
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 758 |  |  | $ | — |  |  | $ | — |  |  | $ | 758 |  |  | $ | 653 |
OREO |  | 4,524 |  |  | — |  |  | — |  |  | 4,524 |  |  | 949 |
|  | $ | 5,282 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,282 |  |  | $ | 1,602 |
Fair Value Inputs, Assets, Quantitative Information [Table Text Block] | The range and weighted-average of the significant unobservable inputs used to fair value our Level 3 nonrecurring assets during 2016 and 2015, along with the valuation techniques used, are shown in the following tables:
|  | Fair value at December 31, 2016 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans - collateral-dependent (3) |  | $ | 2,248 |  |  | Fair Market Value of Collateral |  | Adjustment to Stated Value |  | N/A (2)
Impaired loans - other |  | $ | 1,539 |  |  | Discounted Cash Flow |  | Discount Rate |  | 4.50% - 6.50% (5.26%)
OREO |  | $ | 4,388 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount rate used in discounted cash flow valuation.
(2) Quantitative disclosures are not provided for collateral-dependent impaired loans and OREO because there were no adjustments made to the appraisal values or stated values during the current period.
(3) Collateral consists of accounts receivable, inventory, equipment, and real property.
|  | Fair value at December 31, 2015 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans - real estate collateral |  | $ | 380 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
Impaired loans - other collateral (3) |  | $ | 378 |  |  | Fair Market Value of Collateral |  | Adjustment to Stated Value |  | N/A (2)
OREO |  | $ | 4,524 |  |  | 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 equipment and life insurance).
(2) Quantitative disclosures are not provided because there were no adjustments made to the appraisal value during the current period.
(3) Other collateral consists of equipment and life insurance.
Fair Value, by Balance Sheet Grouping | The following tables summarize carrying amounts and estimated fair values of selected financial instruments for the periods indicated:
|  | December 31, 2016
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 193,038 |  |  | $ | 193,038 |  |  | $ | 193,038 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 31,200 |  |  | 31,200 |  |  | 31,200 |  |  | — |  |  | — |
Securities available for sale |  | 2,278,577 |  |  | 2,278,577 |  |  | 800 |  |  | 2,277,777 |  |  | — |
FHLB stock |  | 10,240 |  |  | 10,240 |  |  | — |  |  | 10,240 |  |  | — |
Loans held for sale |  | 5,846 |  |  | 5,846 |  |  | — |  |  | 5,846 |  |  | — |
Loans |  | 6,143,380 |  |  | 6,040,439 |  |  | — |  |  | — |  |  | 6,040,439 |
FDIC loss-sharing asset |  | 3,535 |  |  | 867 |  |  | — |  |  | — |  |  | 867 |
Interest rate contracts |  | 9,012 |  |  | 9,012 |  |  | — |  |  | 9,012 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 8,059,415 |  |  | $ | 8,055,168 |  |  | $ | 7,653,122 |  |  | $ | 402,046 |  |  | $ | — |
FHLB advances |  | 6,493 |  |  | 7,070 |  |  | — |  |  | 7,070 |  |  | — |
Repurchase agreements |  | 80,822 |  |  | 81,131 |  |  | — |  |  | 81,131 |  |  | — |
Interest rate contracts |  | 9,036 |  |  | 9,036 |  |  | — |  |  | 9,036 |  |  | — |
|  | December 31, 2015
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 166,929 |  |  | $ | 166,929 |  |  | $ | 166,929 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 8,373 |  |  | 8,373 |  |  | 8,373 |  |  | — |  |  | — |
Securities available for sale |  | 2,157,694 |  |  | 2,157,694 |  |  | 20,137 |  |  | 2,137,557 |  |  | — |
FHLB stock |  | 12,722 |  |  | 12,722 |  |  | — |  |  | 12,722 |  |  | — |
Loans held for sale |  | 4,509 |  |  | 4,509 |  |  | — |  |  | 4,509 |  |  | — |
Loans |  | 5,746,855 |  |  | 5,752,423 |  |  | — |  |  | — |  |  | 5,752,423 |
FDIC loss-sharing asset |  | 6,568 |  |  | 921 |  |  | — |  |  | — |  |  | 921 |
Interest rate contracts |  | 12,438 |  |  | 12,438 |  |  | — |  |  | 12,438 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 7,438,829 |  |  | $ | 7,434,787 |  |  | $ | 6,979,924 |  |  | $ | 454,863 |  |  | $ | — |
FHLB advances |  | 68,531 |  |  | 69,176 |  |  | — |  |  | 69,176 |  |  | — |
Repurchase agreements |  | 99,699 |  |  | 100,346 |  |  | — |  |  | 100,346 |  |  | — |
Interest rate contracts |  | 12,478 |  |  | 12,478 |  |  | — |  |  | 12,478 |  |  | — |

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