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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of recorded amount of assets and liabilities measured at fair value on a recurring basis | The table below presents the recorded amount of assets and liabilities measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017.
(dollars in thousands) |  | Quoted Prices (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |  |  | Total (Fair Value) |
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. agency securities |  | $ | — |  |  | $ | 230,325 |  |  | $ | — |  |  | $ | 230,325 |
Residential mortgage backed securities |  |  | — |  |  |  | 436,349 |  |  |  | — |  |  |  | 436,349 |
Municipal bonds |  |  | — |  |  |  | 47,736 |  |  |  | — |  |  |  | 47,736 |
Corporate bonds |  |  | — |  |  |  | 6,546 |  |  |  | 1,500 |  |  |  | 8,046 |
Other equity investments |  |  | — |  |  |  | — |  |  |  | 218 |  |  |  | 218 |
Loans held for sale |  |  | — |  |  |  | 18,728 |  |  |  | — |  |  |  | 18,728 |
Mortgage banking derivatives |  |  | — |  |  |  | — |  |  |  | 80 |  |  |  | 80 |
Interest rate swap derivatives |  |  | — |  |  |  | 6,427 |  |  |  | — |  |  |  | 6,427 |
Total assets measured at fair value on a recurring basis as of September 30, 2018 |  | $ | — |  |  | $ | 746,111 |  |  | $ | 1,798 |  |  | $ | 747,909 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage banking derivatives |  | $ | — |  |  | $ | — |  |  | $ | 28 |  |  | $ | 28 |
Total liabilities measured at fair value on a recurring basis as of September 30, 2018 |  | $ | — |  |  | $ | — |  |  | $ | 28 |  |  | $ | 28 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. agency securities |  | $ | — |  |  | $ | 195,984 |  |  | $ | — |  |  | $ | 195,984 |
Residential mortgage backed securities |  |  | — |  |  |  | 317,836 |  |  |  | — |  |  |  | 317,836 |
Municipal bonds |  |  | — |  |  |  | 62,057 |  |  |  | — |  |  |  | 62,057 |
Corporate bonds |  |  | — |  |  |  | 11,673 |  |  |  | 1,500 |  |  |  | 13,173 |
Other equity investments |  |  | — |  |  |  | — |  |  |  | 218 |  |  |  | 218 |
Loans held for sale |  |  | — |  |  |  | 25,096 |  |  |  | — |  |  |  | 25,096 |
Mortgage banking derivatives |  |  | — |  |  |  | — |  |  |  | 43 |  |  |  | 43 |
Interest rate swap derivatives |  |  | — |  |  |  | 2,256 |  |  |  | — |  |  |  | 2,256 |
Total assets measured at fair value on a recurring basis as of December 31, 2017 |  | $ | — |  |  | $ | 614,902 |  |  | $ | 1,761 |  |  | $ | 616,663 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage banking derivatives |  | $ | — |  |  | $ | — |  |  | $ | 10 |  |  | $ | 10 |
Total liabilities measured at fair value on a recurring basis as of December 31, 2017 |  | $ | — |  |  | $ | — |  |  | $ | 10 |  |  | $ | 10 |
Schedule of aggregate fair value and the aggregate unpaid principal balance for loans held for sale measured at fair value | The following table summarizes the difference between the aggregate fair value and the aggregate unpaid principal balance for loans held for sale measured at fair value as of September 30, 2018 and December 31, 2017.
|  | September 30, 2018 |
|  |  |  |  | Aggregate Unpaid |  |  |  |
(dollars in thousands) |  | Fair Value |  | Principal Balance |  | Difference |
Residential mortgage loans held for sale |  | $ | 18,728 |  | $ | 18,488 |  | $ | 240 |
FHA mortgage loans held for sale |  | $ | — |  | $ | — |  | $ | — |
|  | December 31, 2017 |
|  |  |  |  | Aggregate Unpaid |  |  |  |
(dollars in thousands) |  | Fair Value |  | Principal Balance |  | Difference |
Residential mortgage loans held for sale |  | $ | 25,096 |  | $ | 24,674 |  | $ | 422 |
FHA mortgage loans held for sale |  | $ | — |  | $ | — |  | $ | — |
Schedule of the reconciliation of activity for assets and liabilities measured at fair value based on Significant Other Unobservable Inputs (Level 3) | The following is a reconciliation of activity for assets and liabilities measured at fair value based on Significant Other Unobservable Inputs (Level 3):
|  | Investment |  |  | Mortgage Banking |  |  |  |
(dollars in thousands) |  | Securities |  |  | Derivatives |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at January 1, 2018 |  | $ | 1,718 |  |  | $ | 43 |  |  | $ | 1,761 |
Realized gain included in earnings - net mortgage banking derivatives |  |  | — |  |  |  | 37 |  |  |  | 37 |
Purchases of available-for-sale securities |  |  | — |  |  |  | — |  |  |  | — |
Principal redemption |  |  | — |  |  |  | — |  |  |  | — |
Ending balance at September 30, 2018 |  | $ | 1,718 |  |  | $ | 80 |  |  | $ | 1,798 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at January 1, 2018 |  | $ | — |  |  | $ | 10 |  |  | $ | 10 |
Realized loss included in earnings - net mortgage banking derivatives |  |  | — |  |  |  | 18 |  |  |  | 18 |
Principal redemption |  |  | — |  |  |  | — |  |  |  | — |
Ending balance at September 30, 2018 |  | $ | — |  |  | $ | 28 |  |  | $ | 28 |
|  | Investment |  |  | Mortgage Banking |  |  |  |  |
(dollars in thousands) |  | Securities |  |  | Derivatives |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at January 1, 2017 |  | $ | 1,718 |  |  | $ | 114 |  |  | $ | 1,832 |
Realized loss included in earnings - net mortgage banking derivatives |  |  | — |  |  |  | (71 | ) |  |  | (71 | )
Purchases of available-for-sale securities |  |  | — |  |  |  | — |  |  |  | — |
Principal redemption |  |  | — |  |  |  | — |  |  |  | — |
Ending balance at December 31, 2017 |  | $ | 1,718 |  |  | $ | 43 |  |  | $ | 1,761 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at January 1, 2017 |  | $ | — |  |  | $ | 55 |  |  | $ | 55 |
Realized loss included in earnings - net mortgage banking derivatives |  |  | — |  |  |  | (45 | ) |  |  | (45 | )
Principal redemption |  |  | — |  |  |  | — |  |  |  | — |
Ending balance at December 31, 2017 |  | $ | — |  |  | $ | 10 |  |  | $ | 10 |
Schedule of assets measured at fair value on nonrecurring basis | Assets measured at fair value on a nonrecurring basis are included in the table below:
(dollars in thousands) |  | Quoted Prices (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |  |  | Total (Fair Value) |
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | — |  |  | $ | — |  |  | $ | 6,200 |  |  | $ | 6,200 |
Income producing - commercial real estate |  |  | — |  |  |  | — |  |  |  | 6,217 |  |  |  | 6,217 |
Owner occupied - commercial real estate |  |  | — |  |  |  | — |  |  |  | 5,261 |  |  |  | 5,261 |
Real estate mortgage - residential |  |  | — |  |  |  | — |  |  |  | 1,522 |  |  |  | 1,522 |
Construction - commercial and residential |  |  |  |  |  |  |  |  |  |  | 3,030 |  |  |  | 3,030 |
Home equity |  |  | — |  |  |  | — |  |  |  | 487 |  |  |  | 487 |
Other consumer |  |  | — |  |  |  | — |  |  |  | 36 |  |  |  | 36 |
Other real estate owned |  |  | — |  |  |  | — |  |  |  | 1,394 |  |  |  | 1,394 |
Total assets measured at fair value on a nonrecurring basis as of September 30, 2018 |  | $ | — |  |  | $ | — |  |  | $ | 24,147 |  |  | $ | 24,147 |
(dollars in thousands) |  | Quoted Prices (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Other Unobservable Inputs (Level 3) |  |  | Total (Fair Value) |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | $ | — |  |  | $ | — |  |  | $ | 2,266 |  |  | $ | 2,266 |
Income producing - commercial real estate |  |  | — |  |  |  | — |  |  |  | 7,664 |  |  |  | 7,664 |
Owner occupied - commercial real estate |  |  | — |  |  |  | — |  |  |  | 5,214 |  |  |  | 5,214 |
Real estate mortgage - residential |  |  | — |  |  |  | — |  |  |  | 775 |  |  |  | 775 |
Construction - commercial and residential |  |  | — |  |  |  | — |  |  |  | 1,552 |  |  |  | 1,552 |
Home equity |  |  | — |  |  |  | — |  |  |  | 494 |  |  |  | 494 |
Other consumer |  |  | — |  |  |  | — |  |  |  | 11 |  |  |  | 11 |
Other real estate owned |  |  | — |  |  |  | — |  |  |  | 1,394 |  |  |  | 1,394 |
Total assets measured at fair value on a nonrecurring basis as of December 31, 2017 |  | $ | — |  |  | $ | — |  |  | $ | 19,370 |  |  | $ | 19,370 |
Schedule of estimated fair values of financial instruments | The estimated fair values of the Company’s financial instruments at September 30, 2018 and December 31, 2017 are as follows:
|  |  |  |  |  |  |  | Fair Value Measurements |
(dollars in thousands) |  | Carrying Value |  |  | Fair Value |  |  | Quoted Prices (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 4,459 |  |  | $ | 4,459 |  |  | $ | — |  |  | $ | 4,459 |  |  | $ | — |
Federal funds sold |  |  | 17,284 |  |  |  | 17,284 |  |  |  | — |  |  |  | 17,284 |  |  |  | — |
Interest bearing deposits with other banks |  |  | 162,734 |  |  |  | 162,734 |  |  |  | — |  |  |  | 162,734 |  |  |  | — |
Investment securities |  |  | 722,674 |  |  |  | 722,674 |  |  |  | — |  |  |  | 720,956 |  |  |  | 1,718 |
Federal Reserve and Federal Home Loan Bank stock |  |  | 37,257 |  |  |  | 37,257 |  |  |  | — |  |  |  | 37,257 |  |  |  | — |
Loans held for sale |  |  | 18,728 |  |  |  | 18,728 |  |  |  | — |  |  |  | 18,728 |  |  |  | — |
Loans (1) |  |  | 6,776,483 |  |  |  | 6,713,861 |  |  |  | — |  |  |  | — |  |  |  | 6,713,861 |
Bank owned life insurance |  |  | 73,007 |  |  |  | 73,007 |  |  |  | — |  |  |  | 73,007 |  |  |  | — |
Annuity investment |  |  | 12,375 |  |  |  | 12,375 |  |  |  | — |  |  |  | 12,375 |  |  |  | — |
Mortgage banking derivatives |  |  | 80 |  |  |  | 80 |  |  |  | — |  |  |  | — |  |  |  | 80 |
Interst rate swap derivatives |  |  | 6,427 |  |  |  | 6,427 |  |  |  | — |  |  |  | 6,427 |  |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest bearing deposits |  |  | 2,057,886 |  |  |  | 2,057,886 |  |  |  | — |  |  |  | 2,057,886 |  |  |  | — |
Interest bearing deposits |  |  | 3,032,713 |  |  |  | 3,032,713 |  |  |  | — |  |  |  | 3,032,713 |  |  |  | — |
Certificates of deposit |  |  | 1,281,706 |  |  |  | 1,279,407 |  |  |  | — |  |  |  | 1,279,407 |  |  |  | — |
Customer repurchase agreements |  |  | 36,446 |  |  |  | 36,446 |  |  |  | — |  |  |  | 36,446 |  |  |  | — |
Borrowings |  |  | 542,198 |  |  |  | 533,304 |  |  |  | — |  |  |  | 533,304 |  |  |  | — |
Mortgage banking derivatives |  |  | 28 |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | 28 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 7,445 |  |  | $ | 7,445 |  |  | $ | — |  |  | $ | 7,445 |  |  | $ | — |
Federal funds sold |  |  | 15,767 |  |  |  | 15,767 |  |  |  | — |  |  |  | 15,767 |  |  |  | — |
Interest bearing deposits with other banks |  |  | 167,261 |  |  |  | 167,261 |  |  |  | — |  |  |  | 167,261 |  |  |  | — |
Investment securities |  |  | 589,268 |  |  |  | 589,268 |  |  |  | — |  |  |  | 587,550 |  |  |  | 1,718 |
Federal Reserve and Federal Home Loan Bank stock |  |  | 36,324 |  |  |  | 36,324 |  |  |  | — |  |  |  | 36,324 |  |  |  | — |
Loans held for sale |  |  | 25,096 |  |  |  | 25,096 |  |  |  | — |  |  |  | 25,096 |  |  |  | — |
Loans (2) |  |  | 6,346,770 |  |  |  | 6,381,213 |  |  |  | — |  |  |  | — |  |  |  | 6,381,213 |
Bank owned life insurance |  |  | 60,947 |  |  |  | 60,947 |  |  |  | — |  |  |  | 60,947 |  |  |  | — |
Annuity investment |  |  | 11,632 |  |  |  | 11,632 |  |  |  | — |  |  |  | 11,632 |  |  |  | — |
Mortgage banking derivatives |  |  | 43 |  |  |  | 43 |  |  |  | — |  |  |  | — |  |  |  | 43 |
Interst rate swap derivatives |  |  | 2,256 |  |  |  | 2,256 |  |  |  | — |  |  |  | 2,256 |  |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest bearing deposits |  |  | 1,982,912 |  |  |  | 1,982,912 |  |  |  | — |  |  |  | 1,982,912 |  |  |  | — |
Interest bearing deposits |  |  | 3,041,563 |  |  |  | 3,041,563 |  |  |  | — |  |  |  | 3,041,563 |  |  |  | — |
Certificates of deposit |  |  | 829,509 |  |  |  | 829,886 |  |  |  | — |  |  |  | 829,886 |  |  |  | — |
Customer repurchase agreements |  |  | 76,561 |  |  |  | 76,561 |  |  |  | — |  |  |  | 76,561 |  |  |  | — |
Borrowings |  |  | 541,905 |  |  |  | 533,162 |  |  |  | — |  |  |  | 533,162 |  |  |  | — |
Mortgage banking derivatives |  |  | 10 |  |  |  | 10 |  |  |  | — |  |  |  | — |  |  |  | 10 |
| (1) | Carrying amount is net of unearned income and the allowance for credit losses. In accordance with the prospective adoption of ASU No. 2016-01, the fair value of loans was measured using an exit price notion.
| (2) | Carrying amount is net of unearned income and the allowance for credit losses. The fair value of loans was measured using an entry price notion.

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- Definition Tabular disclosure for aggregate fari value and unpaid principal balance for loans held for sale. + References No definition available. + Details
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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 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 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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