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Fair Value Measurements - Fair Value, Financial Instruments, Unobservable Input Reconciliation (Details) (Recurring basis, USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Securities available for sale, at fair value
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| Level 3 Financial Instruments Measured at Fair Value | ||||
| Beginning balance | $ 3,046,000 | $ 3,051,000 | $ 3,040,000 | $ 3,049,000 |
| Total gains (losses): | ||||
| Included in other comprehensive income | 5,000 | (12,000) | 11,000 | (10,000) |
| Purchases, sales, issuances and settlements: | ||||
| Purchases | 0 | 0 | 0 | 0 |
| Transfer in and/or out of Level 3 | 0 | 0 | 0 | 0 |
| Ending Balance | 3,051,000 | 3,039,000 | 3,051,000 | 3,039,000 |
| Change in unrealized gains relating to assets still held at the reporting date | 5,000 | (12,000) | 11,000 | (10,000) |
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State tax credits held for sale
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| Level 3 Financial Instruments Measured at Fair Value | ||||
| Beginning balance | 14,900,000 | 20,053,000 | 16,491,000 | 23,020,000 |
| Total gains (losses): | ||||
| Included in earnings | 142,000 | (51,000) | 260,000 | 105,000 |
| Purchases, sales, issuances and settlements: | ||||
| Sales | (57,000) | (180,000) | (1,766,000) | (3,303,000) |
| Ending Balance | 14,985,000 | 19,822,000 | 14,985,000 | 19,822,000 |
| Change in unrealized gains relating to assets still held at the reporting date | $ 130,000 | $ (99,000) | $ (204,000) | $ (773,000) |