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Fair Value Disclosures - Estimated Fair Value of Company's Financial Assets and Financial Liabilities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash and cash equivalents, Fair Value | $ 134,129,000 | $ 114,514,000 |  |
Securities - Held to maturity, Fair value | 7,527,000 | 30,821,000 |  |
Loans not previously presented, net, Fair Value | 2,800,362,000 | 2,002,487,000 |  |
Loans included in assets held for sale, net, Fair Value | 69,268,000 |  |  |
Accrued interest receivable, Fair Value | 15,517,000 | 12,663,000 |  |
Cash and cash equivalents, Carrying Amount | 134,129,000 | 114,514,000 | $ 105,277,000 | $ 160,888,000
Securities - held to maturity, Carrying Amount | 8,557,000 | 29,352,000 |  |
Loans not previously presented, net, Carrying Amount | 2,780,228,000 | 1,996,822,000 |  |
Loans included in assets held for sale, net, Carrying Amount | 68,668,000 |  |  |
FHLB stock, Carrying Amount | 16,006,000 | 8,430,000 |  |
Accrued interest receivable, Carrying Amount | 15,517,000 | 12,663,000 |  |
Financial liabilities: |  |  |  |
Deposits, Fair Value | 2,616,034,000 | 2,014,922,000 |  |
Customer repurchase agreements, Fair Value | 11,488,000 | 10,490,000 |  |
Federal Home Loan Bank advances, Fair Value | 365,000,000 | 230,000,000 |  |
Subordinated notes, Fair Value | 52,310,000 | 50,920,000 |  |
Junior subordinated debentures, Fair Value | 41,563,000 | 32,905,000 |  |
Accrued interest payable, Fair Value | 3,323,000 | 2,682,000 |  |
Deposits, Carrying Amount | 2,621,348,000 | 2,015,785,000 |  |
Customer repurchase agreements, Carrying Amount | 11,488,000 | 10,490,000 |  |
Federal Home Loan Bank advances | 365,000,000 | 230,000,000 |  |
Subordinated notes, carrying values | 48,828,000 | 48,734,000 |  |
Junior subordinated debentures, Carrying Amount | 38,623,000 | 32,740,000 |  |
Accrued interest payable, Carrying Amount | 3,323,000 | 2,682,000 |  |
Level 1 |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents, Fair Value | 134,129,000 | 114,514,000 |  |
Accrued interest receivable, Fair Value | 15,517,000 | 12,663,000 |  |
Financial liabilities: |  |  |  |
Accrued interest payable, Fair Value | 3,323,000 | 2,682,000 |  |
Level 2 |  |  |  |
Financial assets: |  |  |  |
Securities - Held to maturity, Fair value | 0 | 27,498,000 |  |
Financial liabilities: |  |  |  |
Deposits, Fair Value | 2,616,034,000 | 2,014,922,000 |  |
Customer repurchase agreements, Fair Value | 11,488,000 | 10,490,000 |  |
Federal Home Loan Bank advances, Fair Value | 365,000,000 | 230,000,000 |  |
Subordinated notes, Fair Value | 52,310,000 | 50,920,000 |  |
Junior subordinated debentures, Fair Value | 41,563,000 | 32,905,000 |  |
Level 3 |  |  |  |
Financial assets: |  |  |  |
Securities - Held to maturity, Fair value | 7,527,000 | 3,323,000 |  |
Loans not previously presented, net, Fair Value | 2,800,362,000 | $ 2,002,487,000 |  |
Loans included in assets held for sale, net, Fair Value | $ 69,268,000 |  |  |

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio. Excludes loans and leases measured at fair value on a nonrecurring basis. + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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