Loans Receivable (Interest Income Recognized in loans individually evaluated for impairment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loan [Member]
Impaired Financing Receivable Interest Income Accrual Method [Abstract]
Total Interest Income	$ 5,714	$ 5,583	$ 4,849
Impaired Financing Receivable Average Recorded Investment [Abstract]
Total Average Recorded Investment	150,671	251,489	330,207
Originated Loans [Member]
Impaired Financing Receivable Interest Income Accrual Method [Abstract]
Total Interest Income	5,714	5,583	4,849
Impaired Financing Receivable Average Recorded Investment [Abstract]
Total Average Recorded Investment	149,877	250,562	330,207
Acquired loans accounted for under ASC 310-20 [Member]
Impaired Financing Receivable Interest Income Accrual Method [Abstract]
Total Interest Income	0	0	0
Impaired Financing Receivable Average Recorded Investment [Abstract]
Total Average Recorded Investment	0	608	0
Commercial Loan [Member] | Originated Loans [Member]
Impaired Financing Receivable Interest Income Accrual Method [Abstract]
Impaired Financing Receivable With Related Allowance Interest Income Accrual Method	1,538	452	280
Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method	875	1,941	1,350
Impaired Financing Receivable Average Recorded Investment [Abstract]
Impaired Financing Receivable With Related Allowance Average Recorded Investment	25,797	118,980	175,115
Impaired Financing Receivable With No Related Allowance Average Recorded Investment	36,666	40,443	64,356
Commercial Loan [Member] | Acquired loans accounted for under ASC 310-20 [Member]
Impaired Financing Receivable Interest Income Accrual Method [Abstract]
Impaired Financing Receivable With Related Allowance Interest Income Accrual Method	0	0	0
Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method	0	0	0
Impaired Financing Receivable Average Recorded Investment [Abstract]
Impaired Financing Receivable With Related Allowance Average Recorded Investment	794	319	0
Impaired Financing Receivable With No Related Allowance Average Recorded Investment	0	608	0
Troubled Debt Restructuring [Member] | Originated Loans [Member]
Impaired Financing Receivable Interest Income Accrual Method [Abstract]
Impaired Financing Receivable With Related Allowance Interest Income Accrual Method	3,301	3,190	3,219
Impaired Financing Receivable Average Recorded Investment [Abstract]
Impaired Financing Receivable With Related Allowance Average Recorded Investment	$ 87,414	$ 91,139	$ 90,736