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Fair Value (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Carrying amounts and estimated fair values of financial instruments: |  |  |
Cash and due from banks, noninterest-bearing | $ 50,209 | $ 114,301 | $ 82,758
Due from banks, interest-bearing | 460,520 | 375,189 | 326,089
Securities available for sale | 353,068 | 343,270 | 198,924
Securities held to maturity | 104,819 | 118,503 | 123,156
Total loans, net of allowance | 4,170,082 | 4,019,071 | 3,405,162
Accrued interest receivable | 14,982 | 14,094 | 11,445
Bank-owned life insurance | 101,055 | 99,162 | 88,081
Accrued interest payable | 1,916 | 1,235 | $ 1,143
Carrying Amount [Member] | Quoted Prices in Markets for Identical Assets (Level 1) [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Cash and due from banks, noninterest-bearing | 50,209 | 114,301 |
Due from banks, interest-bearing | 460,520 | 375,189 |
Presold mortgages in process of settlement | 6,111 | 12,459 |
Accrued interest receivable | 14,982 | 14,094 |
Bank-owned life insurance | 101,055 | 99,162 |
Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Securities available for sale | 353,068 | 343,270 |
Securities held to maturity | 104,819 | 118,503 |
Deposits | 4,528,373 | 4,406,955 |
Borrowings | 406,593 | 407,543 |
Accrued interest payable | 1,916 | 1,235 |
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Total loans, net of allowance | 4,170,082 | 4,019,071 |
Fair Value [Member] | Quoted Prices in Markets for Identical Assets (Level 1) [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Cash and due from banks, noninterest-bearing | 50,209 | 114,301 |
Due from banks, interest-bearing | 460,520 | 375,189 |
Presold mortgages in process of settlement | 6,111 | 12,459 |
Accrued interest receivable | 14,982 | 14,094 |
Bank-owned life insurance | 101,055 | 99,162 |
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Securities available for sale | 353,068 | 343,270 |
Securities held to maturity | 103,360 | 118,998 |
Deposits | 4,522,134 | 4,401,757 |
Borrowings | 398,109 | 397,903 |
Accrued interest payable | 1,916 | 1,235 |
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Carrying amounts and estimated fair values of financial instruments: |  |  |
Total loans, net of allowance | $ 4,126,000 | $ 4,010,551 |

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