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Fair Value Measurements - Reconciliation for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Trust preferred securities - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reconciliation for assets and liabilities measured at fair value on a recurring basis        
Beginning balance $ 10,401 $ 16,992 $ 9,388 $ 18,389
Accretion included in net income 8 28 25 74
Unrealized gains included in other comprehensive income (45) 1,307 1,007 1,866
Reclassification adjustment       0
Purchases 0 0 0 0
Sales 0 (9,346) 0 (9,346)
Issues 0 0 0 0
Settlements (60) (21) (116) (2,023)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance $ 10,304 $ 8,960 $ 10,304 $ 8,960