Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 24,306us-gaap_NetIncomeLoss	$ 729us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,588us-gaap_ProvisionForLoanAndLeaseLosses
Provision for real estate losses	1,513us-gaap_ProvisionForOtherLosses	726us-gaap_ProvisionForOtherLosses
Deferred tax provision (benefit)	1,286us-gaap_DeferredIncomeTaxExpenseBenefit	(14)us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred tax valuation allowance	(21,856)	25
Net amortization (accretion) of investment securities	147	(6)
Federal Home Loan Bank stock dividends	(9)bsf_FederalHomeLoanBankDividends	(1)bsf_FederalHomeLoanBankDividends
Gain on sale of fixed assets, net	(24)	(58)
Gain on sale of real estate owned, net	(338)	(754)
Gain on sales of investment securities, net	(31)us-gaap_GainLossOnSaleOfSecuritiesNet	(25)us-gaap_GainLossOnSaleOfSecuritiesNet
Originations of loans held for sale	(98,853)	(54,068)
Proceeds from sales of loans held for sale	101,093	55,401
Gain on sale of loans originated to sell	(2,774)us-gaap_GainLossOnSalesOfLoansNet	(1,103)us-gaap_GainLossOnSalesOfLoansNet
Depreciation	2,171us-gaap_Depreciation	1,358us-gaap_Depreciation
Amortization of deferred loan costs, net	85	108
Accretion of purchased loans, net	(4,375)us-gaap_AccretionExpense
Amortization of other intangible assets	339us-gaap_AmortizationOfIntangibleAssets
Stock compensation	468us-gaap_ShareBasedCompensation	243us-gaap_ShareBasedCompensation
Earnings on life insurance policies	(1,126)us-gaap_BankOwnedLifeInsuranceIncome	(808)us-gaap_BankOwnedLifeInsuranceIncome
Changes in operating assets and liabilities:
Accrued interest receivable	(58)	28
Prepaid expenses and other assets	300	(539)
Other liabilities	1,674	(656)
Net cash provided by operating activities	5,526	586
INVESTING ACTIVITIES:
Cash paid for purchase of FNSC, net of cash received	(8,985)
Net decrease in federal funds sold	43,025
Redemptions of interest bearing time deposits in banks	11,697	5,474
Purchases of investment securities available for sale (“AFS”)	(54,115)	(37,627)
Proceeds from sales of investment securities AFS	4,374	12,169
Proceeds from maturities/calls/paydowns of investment securities AFS	87,286	6,856
Federal Home Loan Bank stock purchased	(657)	(197)
Federal Home Loan Bank stock redeemed	1,874	116
Federal Reserve Bank stock redeemed	865
Loan originations, net of repayments	(40,596)us-gaap_ProceedsFromLoanOriginations1	(47,277)us-gaap_ProceedsFromLoanOriginations1
Loan participations purchased	(27,491)	(13,104)
Loans sold	2,710	24,930
Proceeds from sales of real estate owned	4,529	9,491
Other cash activity – real estate owned		90bsf_ImprovementsToRealEstateOwned
Proceeds from sales of office properties and equipment	409	2,315
Purchases of office properties and equipment	(3,820)	(1,750)
Purchases of bank owned life insurance	(17,258)
Net cash provided (used in) by investing activities	3,847	(38,514)
FINANCING ACTIVITIES:
Net increase in deposits	30,534us-gaap_IncreaseDecreaseInDeposits	36,366us-gaap_IncreaseDecreaseInDeposits
Sale of deposits in connection with branch sales		(21,692)bsf_ProceedsFromSaleOfDeposits
Proceeds from advances from Federal Home Loan Bank	16,000	5,000
Repayment of advances from Federal Home Loan Bank	(1,094)	(2,168)
Proceeds from other borrowings	18,163us-gaap_ProceedsFromOtherDebt
Repayments of other borrowings	(5,250)us-gaap_RepaymentsOfOtherDebt
Net decrease in short term borrowings	(2,212)
Proceeds from private placement	20,000
Proceeds from exercise of warrants	3,590us-gaap_ProceedsFromWarrantExercises	1,785us-gaap_ProceedsFromWarrantExercises
Proceeds from exercise of stock options	24
Repurchase of common stock	(5)
Payment for fractional shares, stock dividend	(7)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	79,743	19,291
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	89,116	(18,637)
CASH AND CASH EQUIVALENTS:
Beginning of period	23,970	42,607
End of period	113,086	23,970
Cash paid for:
Interest	5,050us-gaap_InterestPaid	3,382us-gaap_InterestPaid
Income taxes		11us-gaap_IncomeTaxesPaid
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Real estate and other assets acquired in settlement of loans	1,915us-gaap_TransferToOtherRealEstate	2,537us-gaap_TransferToOtherRealEstate
Sales of real estate owned financed by the Bank	115	1,015
Investment securities purchased—not settled	1,608	100
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