Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments:
Fixed maturities	$ 451,809	$ 431,550
Equity securities	162,107	145,828
Limited partnerships	81,230us-gaap_OtherLongTermInvestments	68,988us-gaap_OtherLongTermInvestments
Short-term and other	2,966us-gaap_OtherShortTermInvestments	4,891us-gaap_OtherShortTermInvestments
Total Investments	698,112us-gaap_Investments	651,257us-gaap_Investments
Cash and cash equivalents	64,632	59,297
Accounts receivable--less allowance (2014, $605; 2013, $615)	98,144us-gaap_PremiumsAndOtherReceivablesNet	100,830us-gaap_PremiumsAndOtherReceivablesNet
Accrued investment income	3,682	3,448
Reinsurance recoverable	220,221us-gaap_ReinsuranceRecoverables	195,568us-gaap_ReinsuranceRecoverables
Prepaid reinsurance premiums	2,274us-gaap_PrepaidInsurance	1,057us-gaap_PrepaidInsurance
Deferred policy acquisition costs	2,263us-gaap_DeferredPolicyAcquisitionCosts	2,319us-gaap_DeferredPolicyAcquisitionCosts
Property and equipment--less accumulated depreciation $(2014, 13,777; 2013, $15,835)	43,815us-gaap_PropertyPlantAndEquipmentNet	36,329us-gaap_PropertyPlantAndEquipmentNet
Other assets	9,413us-gaap_OtherAssets	19,051us-gaap_OtherAssets
Current federal income taxes recoverable	1,691us-gaap_IncomeTaxReceivable	3,114us-gaap_IncomeTaxReceivable
Total Assets	1,144,247us-gaap_Assets	1,072,270us-gaap_Assets
Reserves:
Losses and loss expenses	506,102	474,470
Unearned premiums	35,019us-gaap_UnearnedPremiums	36,693us-gaap_UnearnedPremiums
Total Reserves	541,121bwinb_TotalReserves	511,163bwinb_TotalReserves
Reinsurance payable	46,338us-gaap_ReinsurancePayable	39,122us-gaap_ReinsurancePayable
Short-term borrowings	20,000	10,000
Depository liabilities	48,893us-gaap_Deposits	57,544us-gaap_Deposits
Accounts payable and other liabilities	68,426	55,866
Deferred federal income taxes	19,973us-gaap_DeferredTaxLiabilities	16,851us-gaap_DeferredTaxLiabilities
Total Liabilities	744,751us-gaap_Liabilities	690,546us-gaap_Liabilities
Shareholders' equity:
Additional paid-in capital	51,854	50,594
Unrealized net gains on investments	51,840bwinb_UnrealizedNetGainsOnInvestments	49,089bwinb_UnrealizedNetGainsOnInvestments
Foreign exchange adjustment	390	1,401
Retained earnings	294,773	280,003
Shareholders' equity	399,496us-gaap_StockholdersEquity	381,724us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	1,144,247	1,072,270
Class A (voting) [Member]
Shareholders' equity:
Common stock	112	112
Class B (non-voting) [Member]
Shareholders' equity:
Common stock	$ 527	$ 525

Aggregate amount of liabilities associated with the company's insurance policies as of the balance sheet date.

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