Fair Value Measurements (Fair Value Financial Assets Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	$ 523,275	$ 310,262
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Interest rate swap derivatives	0	0
Total assets	0	0
Interest rate swap derivatives	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	523,275	310,262
Interest rate swap derivatives	18,097	8,646
Total assets	541,372	318,908
Interest rate swap derivatives	18,097	8,646
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Interest rate swap derivatives	0	0
Total assets	0	0
Interest rate swap derivatives	$ 0	$ 0