CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF CASH FLOWS [Abstract]
NET INCOME (LOSS)	$ 15,295us-gaap_NetIncomeLoss	$ 12,718us-gaap_NetIncomeLoss	$ (1,748)us-gaap_NetIncomeLoss
ADJUSTMENTS TO RECONCILE NET INCOME (LOSS) TO NET CASH PROVIDED BY OPERATING ACTIVITIES
Provision for loan losses	1,000	1,250	8,500
Depreciation and amortization	2,358	3,258	2,572
Stock-based compensation	811us-gaap_ShareBasedCompensation	579us-gaap_ShareBasedCompensation	458us-gaap_ShareBasedCompensation
Net amortization of premiums	1,188	1,312	1,411
Originations of mortgage loans for sale	(16,582)	(42,052)	(47,832)
Proceeds from sale of mortgage loans originated for sale	15,682	47,519	49,014
Gain on sale of mortgage loans originated for sale	(283)us-gaap_GainLossOnSaleOfMortgageLoans	(1,062)us-gaap_GainLossOnSaleOfMortgageLoans	(1,182)us-gaap_GainLossOnSaleOfMortgageLoans
Gain on sale of portfolio loans	(217)us-gaap_GainLossOnSalesOfLoansNet	(445)us-gaap_GainLossOnSalesOfLoansNet	(755)us-gaap_GainLossOnSalesOfLoansNet
Increase in other intangibles	(13)	(308)	(233)
Deferred tax (benefit) expense	(1,711)	3,077	3,133
(Increase) decrease in income tax receivable	(820)	5,406	15
(Increase) decrease in accrued interest and loan fees receivable	(235)	(558)	2,002
Decrease in other assets	454	1,742	2,177
Adjustment to unfunded pension liability	(1,365)	(63)	3,147
(Decrease) increase in other liabilities	(2,011)	2,514	1,797
Income from bank owned life insurance	(1,355)us-gaap_BankOwnedLifeInsuranceIncome	(755)us-gaap_BankOwnedLifeInsuranceIncome	0us-gaap_BankOwnedLifeInsuranceIncome
Gain on Visa shares sold	0	(7,766)	0
Gain on sale of premises and equipment	(751)	(404)	0
Loss on sale and writedowns of other real estate owned ("OREO")	0	47	600
Net (gain) loss on sale of securities available for sale	(19)us-gaap_GainLossOnSaleOfSecuritiesNet	(403)us-gaap_GainLossOnSaleOfSecuritiesNet	217us-gaap_GainLossOnSaleOfSecuritiesNet
Net cash provided by operating activities	11,426	25,606	23,293
CASH FLOWS FROM INVESTING ACTIVITIES
Principal payments on investment securities	11,055	55,904	32,662
Proceeds from sale of investment securities - available for sale	20,604	13,427	7,457
Maturities of investment securities - available for sale	29,634	24,752	33,493
Purchases of investment securities - available for sale	(800)	(116,403)	(181,789)
Maturities of investment securities - held to maturity	1,084	1,593	2,247
Purchases of investment securities - held to maturity	(3,434)	(5,243)	(990)
Increase in interest-bearing time deposits in other banks	0	(10,000)	0
(Increase) decrease in Federal Reserve Bank, Federal Home Loan Bank and other stock	(5,737)	180	(507)
Proceeds from sale of portfolio loans	25,443	7,732	56,993
Loan (originations) repayments - net	(336,005)	(300,796)	100,680
Proceeds from sale of Visa shares	0subk_ProceedsFromSaleOfVisaShares	7,766subk_ProceedsFromSaleOfVisaShares	0subk_ProceedsFromSaleOfVisaShares
Proceeds from sale of premises and equipment	1,064	851	0
Proceeds from sale of OREO	0	1,525	0
Increase in bank owned life insurance	(5,000)	(38,000)	0
Purchases of premises and equipment - net	(1,051)	(1,310)	(2,244)
Net cash (used in) provided by investing activities	(263,143)	(358,022)	48,002
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposit accounts	45,999us-gaap_IncreaseDecreaseInDeposits	78,947us-gaap_IncreaseDecreaseInDeposits	119,242us-gaap_IncreaseDecreaseInDeposits
Net increase in borrowings	130,000us-gaap_RepaymentsOfShortTermDebt	0us-gaap_RepaymentsOfShortTermDebt	0us-gaap_RepaymentsOfShortTermDebt
Proceeds from private equity offering, net	0	0	22,759
Proceeds from stock options exercised	246	91	0
Cash dividends paid on common stock	(1,399)us-gaap_PaymentsOfDividendsCommonStock	0us-gaap_PaymentsOfDividendsCommonStock	0us-gaap_PaymentsOfDividendsCommonStock
Proceeds from shares issued under the dividend reinvestment plan	136us-gaap_DividendsCommonStockStock	0us-gaap_DividendsCommonStockStock	0us-gaap_DividendsCommonStockStock
Decrease in capital lease payable	(101)	(76)	(49)
Net cash provided by financing activities	174,881	78,962	141,952
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(76,836)	(253,454)	213,247
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	132,352	385,806	172,559
CASH AND CASH EQUIVALENTS, END OF PERIOD	55,516	132,352	385,806
SUPPLEMENTAL DATA:
Interest paid	2,543us-gaap_InterestPaid	3,007us-gaap_InterestPaid	3,830us-gaap_InterestPaid
Income taxes paid	6,314us-gaap_IncomeTaxesPaid	480us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
Loans transferred to held-for-sale	50,363	6,383	56,843
Loans transferred to OREO	0us-gaap_TransferToOtherRealEstate	0us-gaap_TransferToOtherRealEstate	372us-gaap_TransferToOtherRealEstate
Investment securities transferred from available for sale to held to maturity	$ 48,147	$ 0	$ 0

Amount of increase (decrease) in Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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The carrying amount of investment securities transferred from available for sale to held to maturity securities during the period.

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The cash outflow for payments to purchase bank owned life insurance policies for which the entity is the beneficiary.

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The cash outflow to acquire interest-bearing time deposits in other banks.

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Principal payments on investment securities available for sale.

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The net cash received associated with the disposal of all investments securities.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in stock.

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The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period in the amount due from borrowers for interest payments.

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The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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The increase (decrease) during the reporting period in intangible assets (for example patents and licenses).

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The increase (decrease) during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in the amount due to fund retirement benefits to employees, retired and disabled former employees.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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