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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Summary of Company's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables summarize the Company’s financial assets and liabilities that were measured at fair value on a recurring basis at December 31, 2017 and 2016:
|  |  |  |  |  | Fair Value Measurements Using |
2017 |  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Notes |  | $ | 14,863 |  |  | $ | 14,863 |  |  | $ | — |  |  | $ | — |
U.S. Government agencies |  |  | 52,958 |  |  |  | — |  |  |  | 52,958 |  |  |  | — |
Obligations of states, municipalities, and political subdivisions |  |  | 33,170 |  |  |  | — |  |  |  | 32,795 |  |  |  | 375 |
Mortgage-backed securities; residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 307,457 |  |  |  | — |  |  |  | 307,457 |  |  |  | — |
Non-Agency |  |  | 39,514 |  |  |  | — |  |  |  | 39,514 |  |  |  | — |
Mortgage-backed securities; commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 69,043 |  |  |  | — |  |  |  | 69,043 |  |  |  | — |
Non-Agency |  |  | 30,971 |  |  |  | — |  |  |  | 30,971 |  |  |  | — |
Corporate securities |  |  | 29,976 |  |  |  | — |  |  |  | 29,976 |  |  |  | — |
Other securities |  |  | 5,284 |  |  |  | 1,921 |  |  |  | 2,686 |  |  |  | 677 |
Servicing assets |  |  | 21,400 |  |  |  | — |  |  |  | — |  |  |  | 21,400 |
Derivative assets |  |  | 5,981 |  |  |  | — |  |  |  | 5,981 |  |  |  | — |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities |  |  | 994 |  |  |  | — |  |  |  | 994 |  |  |  | — |
|  |  |  |  |  | Fair Value Measurements Using |
2016 |  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Notes |  | $ | 14,920 |  |  | $ | 14,920 |  |  | $ | — |  |  | $ | — |
U.S. Government agencies |  |  | 58,857 |  |  |  | — |  |  |  | 58,857 |  |  |  | — |
Obligations of states, municipalities, and political subdivisions |  |  | 16,059 |  |  |  | — |  |  |  | 15,509 |  |  |  | 550 |
Mortgage-backed securities; residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 368,160 |  |  |  | — |  |  |  | 368,160 |  |  |  | — |
Non-Agency |  |  | 19,933 |  |  |  | — |  |  |  | 19,933 |  |  |  | — |
Mortgage-backed securities; commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  |  | 77,403 |  |  |  | — |  |  |  | 77,403 |  |  |  | — |
Non-Agency |  |  | 31,052 |  |  |  | — |  |  |  | 31,052 |  |  |  | — |
Corporate securities |  |  | 17,329 |  |  |  | — |  |  |  | 17,329 |  |  |  | — |
Other securities |  |  | 4,847 |  |  |  | 1,938 |  |  |  | 2,379 |  |  |  | 530 |
Servicing assets |  |  | 21,091 |  |  |  | — |  |  |  | — |  |  |  | 21,091 |
Derivative assets |  |  | 4,317 |  |  |  | — |  |  |  | 4,317 |  |  |  | — |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities |  |  | 559 |  |  |  | — |  |  |  | 559 |  |  |  | — |
Summary of Financial Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs | The following table presents additional information about financial assets measured at fair value on recurring basis for which the Company used significant unobservable inputs (Level 3):
| Twelve Months Ended |
| December 31, |
| 2017 |  | 2016 |  |  | 2017 |  | 2016 |
| Investment Securities |  |  | Servicing Assets |
Balance, beginning of period | $ | 1,080 |  | $ | — |  |  | $ | 21,091 |  | $ | — |
Acquired at fair value |  | — |  |  | 548 |  |  |  | — |  |  | 20,295 |
Additions, net |  | — |  |  | 550 |  |  |  | 6,250 |  |  | 539 |
Maturities |  | (175 | ) |  | — |  |  |  | — |  |  | — |
Amortization |  | 5 |  |  | — |  |  |  | — |  |  | — |
Change in unrealized loss |  | 142 |  |  | (18 | ) |  |  | — |  |  | — |
Change in fair value |  | — |  |  | — |  |  |  | (5,941 | ) |  | 257 |
Balance, end of period | $ | 1,052 |  | $ | 1,080 |  |  | $ | 21,400 |  | $ | 21,091 |
Summary of Unobservable Inputs Used in the Fair Value Measurements on Recurring Basis | The following table presents additional information about the unobservable inputs used in the fair value measurements on recurring basis that were categorized within Level 3 of the fair value hierarchy as of December 31, 2017:
Financial Instruments |  | Valuation Technique |  | Unobservable Inputs |  | Range of Inputs |  | Weighted Average Range |  |  | Impact to Valuation from an Increased or Higher Input Value
Obligations of states, municipalities, and political obligations |  | Discounted cash flow |  | Probability of default |  | 2.2%—2.4% |  |  | 2.3 | % |  | Decrease
Single issuer trust preferred |  | Discounted cash flow |  | Probability of default |  | 7.5%—9.9% |  |  | 8.9 | % |  | Decrease
Servicing assets |  | Discounted cash flow |  | Prepayment speeds |  | 1.6%—9.9% |  |  | 8.6 | % |  | Decrease
|  |  |  | Discount rate |  | 9.9%—18.4% |  |  | 13.8 | % |  | Decrease
|  |  |  | Expected weighted average loan life |  | 0.2—8.2 years |  | 5.8 years |  |  | Increase
Summary of Company's Assets Measured at Fair Value on a Non-Recurring Basis | The following tables summarize the Company’s assets that were measured at fair value on a non-recurring basis, excluding acquired impaired loans, as of December 31, 2017 and 2016:
|  |  |  |  |  | Fair Value Measurements Using |
2017 |  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Non-recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(excluding acquired impaired loans) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 12,783 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,783 |
Residential real estate |  |  | 2,271 |  |  |  | — |  |  |  | — |  |  |  | 2,271 |
Construction, land development, and other land |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial and industrial |  |  | 12,092 |  |  |  | — |  |  |  | — |  |  |  | 12,092 |
Installment and other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Assets held for sale |  |  | 9,779 |  |  |  | — |  |  |  | — |  |  |  | 9,779 |
Other real estate owned |  |  | 10,626 |  |  |  | — |  |  |  | — |  |  |  | 10,626 |
|  |  |  |  |  | Fair Value Measurements Using |
2016 |  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Non-recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(excluding acquired impaired loans) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 8,916 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,916 |
Residential real estate |  |  | 1,007 |  |  |  | — |  |  |  | — |  |  |  | 1,007 |
Construction, land development, and other land |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial and industrial |  |  | 986 |  |  |  | — |  |  |  | — |  |  |  | 986 |
Installment and other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Assets held for sale |  |  | 14,748 |  |  |  | — |  |  |  | — |  |  |  | 14,748 |
Other real estate owned |  |  | 16,570 |  |  |  | — |  |  |  | — |  |  |  | 16,570 |
Summary of the Valuation Technique, Unobservable Inputs and Qualitative Information About the Company's Assets and Liabilities | The following table provides a description of the valuation technique, unobservable inputs and qualitative information about the Company’s assets and liabilities classified as Level 3 and measured at fair value on a non-recurring basis as of December 31, 2017 and 2016:
Financial Instruments |  | Valuation Technique |  | Unobservable Inputs |  | Range of Inputs |  | Impact to Valuation from an Increased or Higher Input Value
Impaired loans (excluding acquired impaired loans) |  | Appraisals |  | Appraisal adjustments, sales costs and other discount adjustments for market conditions |  | 6% - 10% |  | Decrease
Assets held for sale |  | List price, contract price |  | Sales costs and other discount adjustments for market conditions |  | 7% |  | Decrease
Other real estate owned |  | Appraisals |  | Appraisal adjustments, sales costs and other discount adjustments for market conditions |  | 7% - 20% |  | Decrease
Estimated Fair Values of Financial Instruments | The estimated fair values of financial instruments and levels within the fair value hierarchy are as follows:
|  | Fair Value |  |  | 2017 |  |  | 2016 |
|  | Hierarchy Level |  |  | Carrying Amount |  |  | Estimated Fair Value |  |  | Carrying Amount |  |  | Estimated Fair Value |
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  |  | 1 |  |  | $ | 19,404 |  |  | $ | 19,404 |  |  | $ | 17,735 |  |  | $ | 17,735 |
Interest bearing deposits with other banks |  |  | 2 |  |  |  | 38,945 |  |  |  | 38,945 |  |  |  | 28,798 |  |  |  | 28,798 |
Securities held-to-maturity |  |  | 2 |  |  |  | 117,163 |  |  |  | 117,277 |  |  |  | 138,846 |  |  |  | 138,082 |
Other restricted stock |  |  | 2 |  |  |  | 16,343 |  |  |  | 16,343 |  |  |  | 14,993 |  |  |  | 14,993 |
Loans held for sale |  |  | 3 |  |  |  | 5,212 |  |  |  | 5,851 |  |  |  | 23,976 |  |  |  | 26,487 |
Loans and lease receivables, net |  |  | 3 |  |  |  | 2,260,786 |  |  |  | 2,240,235 |  |  |  | 2,137,088 |  |  |  | 2,068,157 |
Accrued interest receivable |  |  | 3 |  |  |  | 7,670 |  |  |  | 7,670 |  |  |  | 6,866 |  |  |  | 6,866 |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-interest bearing deposits |  |  | 2 |  |  |  | 760,887 |  |  |  | 760,887 |  |  |  | 724,457 |  |  |  | 724,457 |
Interest bearing deposits |  |  | 2 |  |  |  | 1,682,442 |  |  |  | 1,678,535 |  |  |  | 1,765,937 |  |  |  | 1,764,078 |
Accrued interest payable |  |  | 2 |  |  |  | 1,306 |  |  |  | 1,306 |  |  |  | 2,427 |  |  |  | 2,427 |
Line of credit |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 20,650 |  |  |  | 20,650 |
Federal Home Loan Bank advances |  |  | 2 |  |  |  | 361,506 |  |  |  | 361,500 |  |  |  | 313,715 |  |  |  | 313,646 |
Securities sold under repurchase agreement |  |  | 2 |  |  |  | 31,187 |  |  |  | 31,187 |  |  |  | 17,249 |  |  |  | 17,249 |
Junior subordinated debentures |  |  | 3 |  |  |  | 27,647 |  |  |  | 33,907 |  |  |  | 26,926 |  |  |  | 26,943 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, used to measure similar assets in prior periods (non-recurring basis) by class of asset or liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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