Loans Receivable (Credit Quality Indicator of loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	$ 4,204,871	$ 4,245,364
Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,204,892	3,046,270
Commercial Secured [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	777,754	773,663
Pass	665,664	679,337
Special Mention	47,221	45,340
Substandard	64,869	48,986
Doubtful	0	0
Loss	0	0
Commercial Secured [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,440	2,533
Pass	393	905
Special Mention	0	337
Substandard	1,047	1,291
Doubtful	0	0
Loss	0	0
Corporate | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	235,426	242,770
Pass	200,395	226,768
Special Mention	33,094	16,002
Substandard	1,937	0
Doubtful	0	0
Loss	0	0
Institutional | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	44,766	26,800
Pass	33,856	16,067
Special Mention	0	9,090
Substandard	10,910	1,643
Doubtful	0	0
Loss	0	0
Middle Market | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	229,941	234,981
Pass	196,058	194,913
Special Mention	4,749	11,689
Substandard	29,134	28,379
Doubtful	0	0
Loss	0	0
Retail | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	246,067	249,728
Pass	215,121	222,205
Special Mention	8,058	8,559
Substandard	22,888	18,964
Doubtful	0	0
Loss	0	0
Retail | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	119	143
Pass	0	0
Special Mention	0	0
Substandard	119	143
Doubtful	0	0
Loss	0	0
Floor Plan | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,998	2,989
Pass	2,678	2,989
Special Mention	1,320	0
Substandard	0	0
Doubtful	0	0
Loss	0	0
Floor Plan | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,321	2,390
Pass	393	905
Special Mention	0	337
Substandard	928	1,148
Doubtful	0	0
Loss	0	0
Real Estate | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	17,556	16,395
Pass	17,556	16,395
Special Mention	0	0
Substandard	0	0
Doubtful	0	0
Loss	0	0
Other commercial and industrial [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	529,507	504,203
Pass	496,138	478,189
Special Mention	22,350	19,795
Substandard	11,019	6,219
Doubtful	0	0
Loss	0	0
Other commercial and industrial [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,940	3,029
Pass	2,933	3,014
Special Mention	0	0
Substandard	7	15
Doubtful	0	0
Loss	0	0
Corporate | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	170,015	136,438
Pass	157,683	136,438
Special Mention	12,332	0
Substandard	0	0
Doubtful	0	0
Loss	0	0
Institutional | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	125,591	180,285
Pass	125,591	180,185
Special Mention	0	100
Substandard	0	0
Doubtful	0	0
Loss	0	0
Middle Market | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	85,363	81,633
Pass	71,222	63,556
Special Mention	6,386	16,150
Substandard	7,755	1,927
Doubtful	0	0
Loss	0	0
Retail | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	113,252	73,705
Pass	109,477	68,743
Special Mention	562	731
Substandard	3,213	4,231
Doubtful	0	0
Loss	0	0
Retail | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,938	3,027
Pass	2,933	3,014
Special Mention	0	0
Substandard	5	13
Doubtful	0	0
Loss	0	0
Floor Plan | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	35,286	32,142
Pass	32,165	29,267
Special Mention	3,070	2,814
Substandard	51	61
Doubtful	0	0
Loss	0	0
Floor Plan | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2	2
Pass	0	0
Special Mention	0	0
Substandard	2	2
Doubtful	0	0
Loss	0	0
Total Commercial subject to risk rating [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,307,261	1,277,866
Pass	1,161,802	1,157,526
Special Mention	69,571	65,135
Substandard	75,888	55,205
Doubtful	0	0
Loss	0	0
Total Commercial subject to risk rating [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,380	5,562
Pass	3,326	3,919
Special Mention	0	337
Substandard	1,054	1,306
Doubtful	0	0
Loss	0	0
Retail [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,897,631	1,768,404
Pass	1,823,998	1,682,886
Special Mention	0	0
Substandard	73,633	85,518
Doubtful	0	0
Loss	0	0
Retail [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	50,884	85,888
Pass	49,348	84,545
Special Mention	0	0
Substandard	1,536	1,343
Doubtful	0	0
Loss	0	0
Mortgage Loan [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	683,607	721,494
Pass	616,110	645,826
Special Mention	0	0
Substandard	67,497	75,668
Doubtful	0	0
Loss	0	0
Conventional Loan [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	553,533	585,089
Pass	516,770	540,373
Special Mention	0	0
Substandard	36,763	44,716
Doubtful	0	0
Loss	0	0
NonTraditional Mortgage [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	18,270	22,859
Pass	14,727	18,129
Special Mention	0	0
Substandard	3,543	4,730
Doubtful	0	0
Loss	0	0
Loss Mitigation Program [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	103,280	103,528
Pass	84,357	86,987
Special Mention	0	0
Substandard	18,923	16,541
Doubtful	0	0
Loss	0	0
Home equity secured personal loans [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	256	337
Pass	256	337
Special Mention	0	0
Substandard	0	0
Doubtful	0	0
Loss	0	0
Option on Loans | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,268	9,681
Pass	0	0
Special Mention	0	0
Substandard	8,268	9,681
Doubtful	0	0
Loss	0	0
Consumer Loan [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	330,039	290,515
Pass	328,135	288,839
Special Mention	0	0
Substandard	1,904	1,676
Doubtful	0	0
Loss	0	0
Consumer Loan [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	28,915	32,862
Pass	27,558	32,035
Special Mention	0	0
Substandard	1,357	827
Doubtful	0	0
Loss	0	0
Credit Cards [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	28,430	26,358
Pass	27,203	25,833
Special Mention	0	0
Substandard	1,227	525
Doubtful	0	0
Loss	0	0
Credit Cards [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	26,467	30,093
Pass	25,156	29,386
Special Mention	0	0
Substandard	1,311	707
Doubtful	0	0
Loss	0	0
Overdrafts [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	214	207
Pass	158	174
Special Mention	0	0
Substandard	56	33
Doubtful	0	0
Loss	0	0
Unsecured personal lines of credit [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,220	2,404
Pass	2,133	2,372
Special Mention	0	0
Substandard	87	32
Doubtful	0	0
Loss	0	0
Unsecured personal loans [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	284,477	246,272
Pass	284,255	245,190
Special Mention	0	0
Substandard	222	1,082
Doubtful	0	0
Loss	0	0
Cash collateral personal loans [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	14,698	15,274
Pass	14,386	15,270
Special Mention	0	0
Substandard	312	4
Doubtful	0	0
Loss	0	0
Personal loans [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,448	2,769
Pass	2,402	2,649
Special Mention	0	0
Substandard	46	120
Doubtful	0	0
Loss	0	0
Auto and Leasing [Member] | Originated Loan [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	883,985	756,395
Pass	879,753	748,221
Special Mention	0	0
Substandard	4,232	8,174
Doubtful	0	0
Loss	0	0
Auto Loan [Member] | Acquired loans (under ASC 310-20) [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	21,969	53,026
Pass	21,790	52,510
Special Mention	0	0
Substandard	179	516
Doubtful	0	0
Loss	0	0
Total Commercial and Retail Loans Subject To Risk Rating Member [Member]
Credit Quality Indicators [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,260,156	3,137,720
Pass	3,038,474	2,928,876
Special Mention	69,571	65,472
Substandard	152,111	143,372
Doubtful	0	0
Loss	$ 0	$ 0