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Bank segment - Credit risk profile - assigned grades (Details) - USD ($) $ in Thousands	Mar. 31, 2015	Dec. 31, 2014
Credit risk profile by internally assigned grade for loans
Commercial real estate	$ 561,189	$ 531,917
Commercial construction	77,164	96,438
Commercial	803,545	791,757
Pass
Credit risk profile by internally assigned grade for loans
Commercial real estate	507,993	493,105
Commercial construction	77,164	79,312
Commercial	739,721	743,334
Special mention
Credit risk profile by internally assigned grade for loans
Commercial real estate	5,203	5,209
Commercial construction	0	0
Commercial	31,863	16,095
Substandard
Credit risk profile by internally assigned grade for loans
Commercial real estate	47,993	33,603
Commercial construction	0	17,126
Commercial	31,335	31,665
Doubtful
Credit risk profile by internally assigned grade for loans
Commercial real estate	0	0
Commercial	$ 626	$ 663

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Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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