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Fair Value - Carrying Amount and Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 25,577 | $ 27,261 | $ 51,635 | $ 27,928
Securities available for sale | 538,721 | 546,043 |  |
Trading securities | 4,692 | 4,576 |  |
Loans held for sale | 544 | 1,381 |  |
Net loans | 1,589,570 | 1,561,061 |  |
FHLB and other equity interests | 13,675 | 15,921 |  |
Liabilities |  |  |  |
Deposits | (1,890,211) | (1,815,053) |  |
Subordinated debentures | (20,620) | (20,620) |  |
Carrying Amount [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 25,577 | 27,261 |  |
Securities available for sale | 538,721 | 546,043 |  |
Trading securities | 4,692 | 4,576 |  |
Loans held for sale | 544 | 1,381 |  |
Net loans | 1,589,570 | 1,561,061 |  |
FHLB and other equity interests | 13,675 | 15,921 |  |
Interest rate swaps | 462 | 131 |  |
Accrued interest receivable | 7,609 | 7,312 |  |
Liabilities |  |  |  |
Deposits | (1,890,211) | (1,815,053) |  |
FHLB and other borrowings | (156,150) | (220,515) |  |
Subordinated debentures | (20,620) | (20,620) |  |
Interest rate swaps | (1,237) | (867) |  |
Accrued interest payable | (820) | (766) |  |
Total Fair Value [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 25,577 | 27,261 |  |
Securities available for sale | 538,721 | 546,043 |  |
Trading securities | 4,692 | 4,576 |  |
Loans held for sale | 546 | 1,438 |  |
Net loans | 1,598,865 | 1,554,502 |  |
Interest rate swaps | 462 | 131 |  |
Accrued interest receivable | 7,609 | 7,312 |  |
Liabilities |  |  |  |
Deposits | (1,890,175) | (1,813,916) |  |
FHLB and other borrowings | (155,165) | (218,808) |  |
Subordinated debentures | (11,802) | (11,761) |  |
Interest rate swaps | (1,237) | (867) |  |
Accrued interest payable | (820) | (766) |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 25,577 | 27,261 |  |
Securities available for sale | 993 | 981 |  |
Trading securities | 4,637 | 4,522 |  |
Loans held for sale | 0 | 0 |  |
Net loans | 0 | 0 |  |
Interest rate swaps | 0 | 0 |  |
Accrued interest receivable | 6 | 5 |  |
Liabilities |  |  |  |
Deposits | (1,700,606) | (1,630,888) |  |
FHLB and other borrowings | 0 | 0 |  |
Subordinated debentures | 0 | 0 |  |
Interest rate swaps | 0 | 0 |  |
Accrued interest payable | (334) | (344) |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Securities available for sale | 534,619 | 541,649 |  |
Trading securities | 55 | 54 |  |
Loans held for sale | 546 | 1,438 |  |
Net loans | 0 | 0 |  |
Interest rate swaps | 462 | 131 |  |
Accrued interest receivable | 3,170 | 2,875 |  |
Liabilities |  |  |  |
Deposits | (189,569) | (183,028) |  |
FHLB and other borrowings | (155,165) | (218,808) |  |
Subordinated debentures | (11,802) | (11,761) |  |
Interest rate swaps | (1,237) | (867) |  |
Accrued interest payable | (467) | (404) |  |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Securities available for sale | 3,109 | 3,413 |  |
Trading securities | 0 | 0 |  |
Loans held for sale | 0 | 0 |  |
Net loans | 1,598,865 | 1,554,502 |  |
Interest rate swaps | 0 | 0 |  |
Accrued interest receivable | 4,433 | 4,432 |  |
Liabilities |  |  |  |
Deposits | 0 | 0 |  |
FHLB and other borrowings | 0 | 0 |  |
Subordinated debentures | 0 | 0 |  |
Interest rate swaps | 0 | 0 |  |
Accrued interest payable | $ (19) | $ (18) |  |

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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, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 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 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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