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Fair Value Accounting and Measurement (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Inputs, Assets, Quantitative Information | The following table sets forth the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis at June 30, 2018 and December 31, 2017 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
June 30, 2018 |  | (in thousands)
Assets |  |  |  |  |  |  |  |
Debt securities available for sale: |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,676,992 |  |  | $ | — |  |  | $ | 1,676,992 |  |  | $ | — |
State and municipal debt securities |  | 577,695 |  |  | — |  |  | 577,695 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 391,274 |  |  | — |  |  | 391,274 |  |  | — |
U.S. government securities |  | 247 |  |  | 247 |  |  | — |  |  | — |
Total debt securities available for sale |  | $ | 2,646,208 |  |  | $ | 247 |  |  | $ | 2,645,961 |  |  | $ | — |
Equity securities |  | $ | 4,963 |  |  | $ | 4,963 |  |  | $ | — |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 8,624 |  |  | $ | — |  |  | $ | 8,624 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 8,624 |  |  | $ | — |  |  | $ | 8,624 |  |  | $ | — |
|  | Fair value |  | Fair Value Measurements at Reporting Date Using
|  | Level 1 |  | Level 2 |  | Level 3
December 31, 2017 |  | (in thousands)
Assets |  |  |  |  |  |  |  |
Debt securities available for sale: |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,726,725 |  |  | $ | — |  |  | $ | 1,726,725 |  |  | $ | — |
State and municipal debt securities |  | 596,004 |  |  | — |  |  | 596,004 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 414,774 |  |  | — |  |  | 414,774 |  |  | — |
U.S. government securities |  | 248 |  |  | 248 |  |  | — |  |  | — |
Total debt securities available for sale |  | $ | 2,737,751 |  |  | $ | 248 |  |  | $ | 2,737,503 |  |  | $ | — |
Equity securities |  | $ | 5,080 |  |  | $ | 5,080 |  |  | $ | — |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 6,707 |  |  | $ | — |  |  | $ | 6,707 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 6,714 |  |  | $ | — |  |  | $ | 6,714 |  |  | $ | — |
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 June 30, 2018 |  | Fair Value Measurements at Reporting Date Using |  | Gains During the Three Months Ended June 30, 2018 |  | Losses During the Six Months Ended June 30, 2018
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 10,792 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,792 |  |  | $ | (1,032 | ) |  | $ | 3,398 |
|  | $ | 10,792 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,792 |  |  | $ | (1,032 | ) |  | $ | 3,398 |
|  | Fair value at June 30, 2017 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Three Months Ended June 30, 2017 |  | Losses During the Six Months Ended June 30, 2017
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 7,019 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,019 |  |  | $ | 3,669 |  |  | $ | 3,669 |
OREO |  | 105 |  |  | — |  |  | — |  |  | 105 |  |  | 33 |  |  | 33 |
|  | $ | 7,124 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,124 |  |  | $ | 3,702 |  |  | $ | 3,702 |
Fair Value, by Balance Sheet Grouping | The following tables summarize carrying amounts and estimated fair values of selected financial instruments by level within the fair value hierarchy at June 30, 2018 and December 31, 2017:
|  | June 30, 2018
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 224,370 |  |  | $ | 224,370 |  |  | $ | 224,370 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 39,169 |  |  | 39,169 |  |  | 39,169 |  |  | — |  |  | — |
Debt securities available for sale |  | 2,646,208 |  |  | 2,646,208 |  |  | 247 |  |  | 2,645,961 |  |  | — |
Equity securities |  | 4,963 |  |  | 4,963 |  |  | 4,963 |  |  | — |  |  | — |
FHLB stock |  | 13,960 |  |  | 13,960 |  |  | — |  |  | 13,960 |  |  | — |
Loans held for sale |  | 6,773 |  |  | 6,773 |  |  | — |  |  | 6,773 |  |  | — |
Loans |  | 8,373,957 |  |  | 8,381,155 |  |  | — |  |  | — |  |  | 8,381,155 |
Interest rate contracts |  | 8,624 |  |  | 8,624 |  |  | — |  |  | 8,624 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 450,602 |  |  | $ | 442,561 |  |  | $ | — |  |  | $ | 442,561 |  |  | $ | — |
FHLB advances |  | 99,549 |  |  | 100,102 |  |  | — |  |  | 100,102 |  |  | — |
Repurchase agreements |  | 46,229 |  |  | 46,229 |  |  | — |  |  | 46,229 |  |  | — |
Subordinated debentures |  | 35,555 |  |  | 34,986 |  |  | — |  |  | 34,986 |  |  | — |
Interest rate contracts |  | 8,624 |  |  | 8,624 |  |  | — |  |  | 8,624 |  |  | — |
|  | December 31, 2017
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 244,615 |  |  | $ | 244,615 |  |  | $ | 244,615 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 97,918 |  |  | 97,918 |  |  | 97,918 |  |  | — |  |  | — |
Debt securities available for sale |  | 2,737,751 |  |  | 2,737,751 |  |  | 248 |  |  | 2,737,503 |  |  | — |
Equity securities |  | 5,080 |  |  | 5,080 |  |  | 5,080 |  |  | — |  |  | — |
FHLB stock |  | 10,440 |  |  | 10,440 |  |  | — |  |  | 10,440 |  |  | — |
Loans held for sale |  | 5,766 |  |  | 5,766 |  |  | — |  |  | 5,766 |  |  | — |
Loans |  | 8,283,011 |  |  | 8,055,817 |  |  | — |  |  | — |  |  | 8,055,817 |
Interest rate contracts |  | 6,707 |  |  | 6,707 |  |  | — |  |  | 6,707 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 10,532,085 |  |  | $ | 10,524,135 |  |  | $ | 10,041,040 |  |  | $ | 483,095 |  |  | $ | — |
FHLB advances |  | 11,579 |  |  | 12,281 |  |  | — |  |  | 12,281 |  |  | — |
Repurchase agreements |  | 79,059 |  |  | 79,070 |  |  | — |  |  | 79,070 |  |  | — |
Subordinated debentures |  | 35,647 |  |  | 35,895 |  |  | — |  |  | 35,895 |  |  | — |
Junior subordinated debentures |  | 8,248 |  |  | 8,248 |  |  | — |  |  | 8,248 |  |  | — |
Interest rate contracts |  | 6,714 |  |  | 6,714 |  |  | — |  |  | 6,714 |  |  | — |
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 June 30, 2018 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans - collateral-dependent (2) |  | $ | 6,933 |  |  | Fair Market Value of Collateral |  | Adjustment to Stated Value |  | 0.00% - 62.81% (15.72%)
Impaired loans - other |  | $ | 3,859 |  |  | Discounted Cash Flow |  | Discount Rate |  | 4.25% - 6.50% (6.12%)
(1) Discount rate applied to discounted cash flow valuation or discount applied to appraisal value or stated value (in the case of accounts receivable, fixed assets, and inventory).
(2) Collateral consists of accounts receivable, fixed assets, inventory, and real estate.
|  | Fair value at June 30, 2017 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans - collateral-dependent (3) |  | $ | 7,019 |  |  | Fair Market Value of Collateral |  | Adjustment to Stated Value |  | 0.00% - 75.00% (60.59%)
OREO |  | $ | 105 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount applied to appraisal value or stated value (in the case of accounts receivable, fixed assets, and inventory).
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values.
(3) Collateral consists of accounts receivable, fixed assets, inventory, and real estate.

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