Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

The change in goodwill during the year is as follows:

	2017		2016
	(dollars in thousands)
Balance, January 1	$	145,909	$	145,909
Acquired goodwill		-		-
Impairment		-		-
Balance, December 31,	$	145,909	$	145,909

Intangible Assets Disclosure [Text Block]

The table below provides information regarding the carrying amounts and accumulated amortization of total amortized intangible assets as of the dates set forth below. 

	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(dollars in thousands)
As of December 31, 2017:
Core deposit intangibles	$	6,011	$	(3,647)	$	2,364
As of December 31, 2016:
Core deposit intangibles	$	6,011	$	(2,923)	$	3,088

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Aggregate amortization expense was $724,000, $820,000 and $917,000 for 2017, 2016 and 2015, respectively. Estimated amortization expense for each of the next five years (dollars in thousands):

2018	$	627
2019		531
2020		434
2021		338
2022		241