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Fair Value Accounting and Measurement (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31, 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
March 31, 2018 |  | (in thousands)
Assets |  |  |  |  |  |  |  |
Debt securities available for sale: |  |  |  |  |  |  |  |
U.S. government agency and government-sponsored enterprise mortgage-back securities and collateralized mortgage obligations |  | $ | 1,645,218 |  |  | $ | — |  |  | $ | 1,645,218 |  |  | $ | — |
State and municipal debt securities |  | 582,748 |  |  | — |  |  | 582,748 |  |  | — |
U.S. government agency and government-sponsored enterprise securities |  | 395,832 |  |  | — |  |  | 395,832 |  |  | — |
U.S. government securities |  | 247 |  |  | 247 |  |  | — |  |  | — |
Total debt securities available for sale |  | $ | 2,624,045 |  |  | $ | 247 |  |  | $ | 2,623,798 |  |  | $ | — |
Equity securities |  | $ | 5,000 |  |  | $ | 5,000 |  |  | $ | — |  |  | $ | — |
Other assets (Interest rate contracts) |  | $ | 7,406 |  |  | $ | — |  |  | $ | 7,406 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |
Other liabilities (Interest rate contracts) |  | $ | 7,409 |  |  | $ | — |  |  | $ | 7,409 |  |  | $ | — |
|  | 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 March 31, 2018 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Three Months Ended March 31, 2018
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
Impaired loans |  | $ | 7,820 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,820 |  |  | $ | 5,058 |
OREO |  | 160 |  |  | — |  |  | — |  |  | 160 |  |  | 51 |
|  | $ | 7,980 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,980 |  |  | $ | 5,109 |
|  | Fair value at March 31, 2017 |  | Fair Value Measurements at Reporting Date Using |  | Losses During the Three Months Ended March 31, 2017
|  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands)
OREO |  | $ | 1,260 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,260 |  |  | $ | 193 |
|  | $ | 1,260 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,260 |  |  | $ | 193 |
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 March 31, 2018 and December 31, 2017:
|  | March 31, 2018
|  | Carrying Amount |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 206,532 |  |  | $ | 206,532 |  |  | $ | 206,532 |  |  | $ | — |  |  | $ | — |
Interest-earning deposits with banks |  | 87,124 |  |  | 87,124 |  |  | 87,124 |  |  | — |  |  | — |
Debt securities available for sale |  | 2,624,045 |  |  | 2,624,045 |  |  | 247 |  |  | 2,623,798 |  |  | — |
Equity securities |  | 5,000 |  |  | 5,000 |  |  | 5,000 |  |  | — |  |  | — |
FHLB stock |  | 11,640 |  |  | 11,640 |  |  | — |  |  | 11,640 |  |  | — |
Loans held for sale |  | 4,312 |  |  | 4,312 |  |  | — |  |  | 4,312 |  |  | — |
Loans |  | 8,259,804 |  |  | 8,281,010 |  |  | — |  |  | — |  |  | 8,281,010 |
Interest rate contracts |  | 7,406 |  |  | 7,406 |  |  | — |  |  | 7,406 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 474,000 |  |  | $ | 465,896 |  |  | $ | — |  |  | $ | 465,896 |  |  | $ | — |
FHLB advances |  | 41,564 |  |  | 42,090 |  |  | — |  |  | 42,090 |  |  | — |
Repurchase agreements |  | 24,247 |  |  | 24,247 |  |  | — |  |  | 24,247 |  |  | — |
Subordinated debentures |  | 35,601 |  |  | 35,486 |  |  | — |  |  | 35,486 |  |  | — |
Interest rate contracts |  | 7,409 |  |  | 7,409 |  |  | — |  |  | 7,409 |  |  | — |
|  | 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 March 31, 2018 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
Impaired loans - collateral-dependent (3) |  | $ | 7,512 |  |  | Fair Market Value of Collateral |  | Adjustment to Stated Value |  | 0.00% - 100.00% (41.33%)
Impaired loans - other (4) |  | $ | 308 |  |  | Discounted Cash Flow |  | Discount Rate |  | 6.00%
OREO |  | $ | 160 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount rate applied to discounted cash flow valuation or appraisal value and 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 during the current period.
(3) Collateral consists of accounts receivable, fixed assets, inventory, and real estate.
(4) As there was only one impaired loan remeasured using discounted cash flows, a range of discounts could not be provided.
|  | Fair value at March 31, 2017 |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average) (1)
|  | (dollars in thousands)
OREO |  | $ | 1,260 |  |  | Fair Market Value of Collateral |  | Adjustment to Appraisal Value |  | N/A (2)
(1) Discount applied to appraisal value.
(2) Quantitative disclosures are not provided for OREO because there were no adjustments made to the appraisal values.

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