Goodwill and Other Intangible Assets (Summary of the Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortizable intangible assets:
Gross Carrying Amount	$ 43,284	$ 41,228
Accumulated Amortization	24,828	20,116
Unamortizable intangible assets:
Goodwill	234,368	234,368
Customer lists
Amortizable intangible assets:
Gross Carrying Amount	6,013	6,013
Accumulated Amortization	2,048	1,637
Core deposit intangibles
Amortizable intangible assets:
Gross Carrying Amount	28,440	28,440
Accumulated Amortization	19,650	16,469
SBA servicing asset
Amortizable intangible assets:
Gross Carrying Amount	7,528	5,472
Accumulated Amortization	2,028	1,053
Other
Amortizable intangible assets:
Gross Carrying Amount	1,303	1,303
Accumulated Amortization	$ 1,102	$ 957