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Fair Value Measurements and Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | For financial assets and liabilities measured at fair value on a recurring basis, the fair value measurements by level within the fair value hierarchy used at June 30, 2019 and December 31, 2018 are as follows:
|  |  |  |  |  | June 30, 2019 |
|  |  |  |  |  | Fair Value Measu rements at Repor ting Date Using |
|  |  |  |  |  | Quoted Prices |  |  |  |  |  |  |
|  |  |  |  |  | in Active |  | Significant |  |  |  |
|  |  |  |  |  | Markets for |  | Other |  | Significant |
|  |  |  |  |  | Identical |  | Observable |  | Unobservable |
|  |  |  |  |  | Assets |  | Inputs |  | Inputs |
|  |  | Total Fair Value |  | (Level 1) |  | (Level 2) |  | (Level 3) |
| (dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |
| Recurring fair value measurements: |  |  |  |  |  |  |  |  |  |  |  |  |
| Assets |  |  |  |  |  |  |  |  |  |  |  |  |
| Investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |
| Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
| Federal agency obligations |  | $ | 25,461 |  | $ | - |  | $ | 25,461 |  | $ | - |
| Residential mortgage pass-through securities |  |  | 229,542 |  |  | - |  |  | 229,542 |  |  | - |
| Commercial mortgage pass-through securities |  |  | 5,826 |  |  | - |  |  | 5,826 |  |  | - |
| Obligations of U.S. states and political subdivision |  |  | 144,119 |  |  | - |  |  | 134,873 |  |  | 9,246 |
| Corporate bonds and notes |  |  | 28,117 |  |  | - |  |  | 28,117 |  |  | - |
| Asset-backed securities |  |  | 7,746 |  |  | - |  |  | 7,746 |  |  | - |
| Certificates of deposit |  |  | 150 |  |  | - |  |  | 150 |  |  | - |
| Other securities |  |  | 950 |  |  | 950 |  |  | - |  |  | - |
| Total available-for-sale |  | $ | 441,911 |  | $ | 950 |  | $ | 431,715 |  | $ | 9,246 |
| Equity securities |  |  | 11,152 |  |  | 11,152 |  |  | - |  |  | - |
| Total assets |  | $ | 453,063 |  | $ | 12,102 |  | $ | 431,715 |  | $ | 9,246 |
| Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
| Derivatives |  |  | 128 |  |  | - |  |  | 128 |  |  | - |
| Total liabilities |  | $ | 128 |  | $ | - |  | $ | 128 |  | $ | - |
|  |  |  |  |  | December 31, 2018 |
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using |
|  |  |  |  |  | Quoted Prices |  |  |  |  |  |  |
|  |  |  |  |  | in Active |  | Significant |  |  |  |
|  |  |  |  |  | Markets for |  | Other |  | Significant |
|  |  |  |  |  | Identical |  | Observable |  | Unobservable |
|  |  |  |  |  | Assets |  | Inputs |  | Inputs |
|  |  | Total Fair Value |  | (Level 1) |  | (Level 2) |  | (Level 3) |
| (dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |
| Recurring fair value measurements: |  |  |  |  |  |  |  |  |  |  |  |  |
| Assets |  |  |  |  |  |  |  |  |  |  |  |  |
| Investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |
| Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
| Federal agency obligations |  | $ | 44,955 |  | $ | - |  | $ | 44,955 |  | $ | - |
| Residential mortgage pass-through securities |  |  | 185,204 |  |  | - |  |  | 185,204 |  |  | - |
| Commercial mortgage pass-through securities |  |  | 3,874 |  |  | - |  |  | 3,874 |  |  | - |
| Obligations of U.S. states and political subdivision |  |  | 139,185 |  |  | - |  |  | 129,808 |  |  | 9,377 |
| Corporate bonds and notes |  |  | 25,813 |  |  | - |  |  | 25,813 |  |  | - |
| Asset-backed securities |  |  | 9,691 |  |  | - |  |  | 9,691 |  |  | - |
| Certificates of deposit |  |  | 322 |  |  | - |  |  | 322 |  |  | - |
| Other securities |  |  | 2,990 |  |  | 2,990 |  |  | - |  |  | - |
| Total available-for-sale |  | $ | 412,034 |  | $ | 2,990 |  | $ | 399,667 |  | $ | 9,377 |
| Equity securities |  |  | 11,460 |  |  | 11,460 |  |  | - |  |  | - |
| Derivatives |  |  | 1,159 |  |  | - |  |  | 1,159 |  |  | - |
| Total assets |  | $ | 424,653 |  | $ | 14,450 |  | $ | 400,826 |  | $ | 9,377 |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] | For assets measured at fair value on a nonrecurring basis, the fair value measurements at June 30, 2019 and December 31, 2018 are as follows:
|  |  |  |  | Fair Value Measurements at Reporting Date Using
|  |  |  |  | Quoted |  |  |  |  |  |
|  |  |  |  | Prices |  |  |  |  |  |
|  |  |  |  | in Active |  | Significant |  |  |
|  |  |  |  | Markets for |  | Other |  | Significant
|  |  |  |  | Identical |  | Observable |  | Unobservable
|  |  |  |  | Assets |  | Inputs |  | Inputs
Assets measured at fair value on a nonrecurring basis: |  | June 30, 2019 |  | (Level 1) |  | (Level 2) |  | (Level 3)
Impaired loans: |  |  |  |  | (dollars in thousands)
Commercial real estate |  | $ | 364 |  | $ | - |  | $ | - |  | $ | 364
Commercial construction |  |  | 2,732 |  |  | - |  |  | - |  |  | 2,732
Residential real estate |  |  | 231 |  |  | - |  |  | - |  |  | 231
|  |  |  |  | Fair Value Measurements at Reporting Date Using
|  |  |  |  | Quoted |  |  |  |  |  |
|  |  |  |  | Prices |  |  |  |  |  |
|  |  |  |  | in Active |  | Significant |  |  |
|  |  |  |  | Markets for |  | Other |  | Significant
|  |  |  |  | Identical |  | Observable |  | Unobservable
Assets measured at fair value on a nonrecurring basis: |  | December 31, 2018 |  | Assets (Level 1) |  | Inputs (Level 2) |  | Inputs (Level 3)
Impaired loans: |  |  |  |  | (dollars in thousands)
Commercial real estate |  | $ | 1,481 |  | $ | - |  | $ | - |  | $ | 1,481
Residential real estate |  |  | 231 |  |  | - |  |  | - |  |  | 231
Fair Value, Recurring basis [Table Text Block] | The tables below present a reconciliation of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the six months ended June 30, 2019 and for the year ended December 31, 2018:
|  | Municipal
|  | Securities
|  | (dollars in thousands)
Beginning balance, January 1, 2019 |  | $ | 9,377 |
Principal paydowns |  |  | (131 | )
Ending balance, June 30, 2019 |  | $ | 9,246 |
|  | Municipal
|  | Securities
|  | (dollars in thousands)
Beginning balance, January 1, 2018 |  | $ | 9,632 |
Principal paydowns |  |  | (255 | )
Ending balance, December 31, 2018 |  | $ | 9,377 |
Significant unobservable inputs used in fair value measurements [Table Text Block] | The following methods and assumptions were used to estimate the fair values of the Company’s assets measured at fair value on a recurring basis at June 30, 2019 and December 31, 2018. The table below provides quantitative information about significant unobservable inputs used in fair value measurements within Level 3 hierarchy.
June 30, 2019 |  |  |  |  |  |  |  |  |
|  |  |  |  | Valuation |  | Unobservable |  |
|  | Fair Value |  | Techniques |  | Input |  | Range
Securities available-for-sale: |  |  |  |  | (dollars in thousands) |  |  |  |
Municipal securities |  | $ | 9,246 |  | Discounted cash flows |  | Discount rate |  | 2.9%
December 31, 2018 |  |  |  |  |  |  |  |  |
|  | Fair Value |  | Valuation Techniques |  | Unobservable Input |  | Range
Securities available-for-sale: |  |  |  |  | (dollars in thousands) |  |  |  |
Municipal securities |  | $ | 9,377 |  | Discounted cash flows |  | Discount rate |  | 2.9%
Fair Value Measurements, Nonrecurring [Table Text Block] | Nonrecurring basis: The following methods and assumptions were used to estimate the fair values of the Company’s assets measured at fair value on a nonrecurring basis for the periods presented. The tables below provide quantitative information about significant unobservable inputs used in fair value measurements within Level 3 hierarchy.
|  |  |  | Valuation |  | Unobservable |  |
June 30, 2019 |  | Fair Value |  | Techniques |  | Input |  | Range
Impaired loans: |  |  |  |  | (dollars in thousands) |  |  |  |
Commercial real estate |  | $ | 364 |  | Sales comparison approach |  | Adjustment for differences between the comparable sales |  | 0% - 20% [10%]
Commercial construction |  | $ | 2,732 |  | Sales comparison approach |  | Adjustment for differences between the comparable sales |  | 0% - 20% [10%]
Residential real estate |  | $ | 231 |  | Sales comparison approach |  | Adjustment for differences between the comparable sales |  | 0% - 7% [2%]
December 31, 2018 |  | Fair Value |  | Valuation Techniques |  | Unobservable Input |  | Range
Impaired loans: |  |  |  |  | (dollars in thousands) |  |  |  |
Commercial real estate |  | $ | 1,481 |  | Sales comparison approach |  | Adjustment for differences between the comparable sales |  | 6% - 9% [8%]
Residential real estate |  | $ | 231 |  | Sales comparison approach |  | Adjustment for differences between the comparable sales |  | 0% - 10% [5%]
Fair Value, by Balance Sheet Grouping [Table Text Block] | As of June 30, 2019 the fair value measurements presented are consistent with Topic 820, Fair Value Measurement, in which fair value represents exit price. The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments as of June 30, 2019 and December 31, 2018:
|  |  |  |  |  |  |  | Fair Value Measurements
|  |  |  |  |  |  |  | Quoted |  |  |  |  |  |
|  |  |  |  |  |  |  | Prices in |  |  |  |  |  |
|  |  |  |  |  |  |  | Active |  | Significant |  |  |
|  |  |  |  |  |  |  | Markets for |  | Other |  | Significant
|  |  |  |  |  |  |  | Identical |  | Observable |  | Unobservable
|  | Carrying |  | Fair |  | Assets |  | Inputs |  | Inputs
|  | Amount |  | Value |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (dollars in thousands)
June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 185,650 |  | $ | 185,650 |  | $ | 185,650 |  | $ | - |  | $ | -
Securities available-for-sale |  |  | 441,911 |  |  | 441,911 |  |  | 950 |  |  | 431,715 |  |  | 9,246
Investment in restricted stocks |  |  | 31,767 |  |  | n/a |  |  | n/a |  |  | n/a |  |  | n/a
Equity securities |  |  | 11,152 |  |  | 11,152 |  |  | 11,152 |  |  | - |  |  | -
Net loans |  |  | 5,052,794 |  |  | 5,041,283 |  |  | - |  |  | - |  |  | 5,041,283
Accrued interest receivable |  |  | 21,272 |  |  | 21,272 |  |  | - |  |  | 2,447 |  |  | 18,825
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest-bearing deposits |  |  | 813,635 |  |  | 813,635 |  |  | 813,635 |  |  | - |  |  | -
Interest-bearing deposits |  |  | 3,827,508 |  |  | 3,839,549 |  |  | 2,203,560 |  |  | 1,635,989 |  |  | -
Borrowings |  |  | 597,317 |  |  | 598,821 |  |  | - |  |  | 598,821 |  |  | -
Subordinated debentures |  |  | 128,720 |  |  | 137,269 |  |  | - |  |  | 137,269 |  |  | -
Derivatives |  |  | 128 |  |  | 128 |  |  | - |  |  | 128 |  |  | -
Accrued interest payable |  |  | 5,561 |  |  | 5,561 |  |  | - |  |  | 5,561 |  |  | -
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 172,366 |  | $ | 172,366 |  | $ | 172,366 |  | $ | - |  | $ | -
Securities available-for-sale |  |  | 412,034 |  |  | 412,034 |  |  | 2,990 |  |  | 399,667 |  |  | 9,377
Investment in restricted stocks |  |  | 31,136 |  |  | n/a |  |  | n/a |  |  | n/a |  |  | n/a
Equity securities |  |  | 11,460 |  |  | 11,460 |  |  | 11,460 |  |  | - |  |  | -
Net loans |  |  | 4,506,138 |  |  | 4,402,878 |  |  | - |  |  | - |  |  | 4,402,878
Derivatives |  |  | 1,159 |  |  | 1,159 |  |  | - |  |  | 1,159 |  |  | -
Accrued interest receivable |  |  | 18,214 |  |  | 18,214 |  |  | - |  |  | 2,064 |  |  | 16,150
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noninterest-bearing deposits |  |  | 768,584 |  |  | 768,584 |  |  | 768,584 |  |  | - |  |  | -
Interest-bearing deposits |  |  | 3,323,508 |  |  | 3,320,640 |  |  | 1,957,503 |  |  | 1,363,137 |  |  | -
Borrowings |  |  | 600,001 |  |  | 598,598 |  |  | - |  |  | 598,598 |  |  | -
Subordinated debentures |  |  | 128,556 |  |  | 132,426 |  |  | - |  |  | 132,426 |  |  | -
Accrued interest payable |  |  | 6,764 |  |  | 6,764 |  |  | - |  |  | 6,764 |  |  | -

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique used to measure similar asset in prior period by class of asset or liability on non-recurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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