Loans, Nonaccrual Loans Segregated by Class of Loans and Loan Portfolio Aging Analysis, Segregated by Class (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	$ 28,951		$ 19,958
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	12,563		10,251
60-89 Days Past Due	9,633		8,661
90+ Days Past Due	45,692		40,021
Total Past Due	67,888		58,933
Current	2,616,017		2,556,421
Total Loans	2,683,905		2,615,354
90+ and Accruing	19,607	[1]	23,599	[1]
Commercial Construction [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	4,700		4,519
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	142		250
60-89 Days Past Due	0		166
90+ Days Past Due	5,951		6,012
Total Past Due	6,093		6,428
Current	114,155		104,351
Total Loans	120,248		110,779
90+ and Accruing	1,251	[1]	1,673	[1]
Commercial Secured by Real Estate [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	14,202		6,576
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	4,428		3,703
60-89 Days Past Due	1,646		1,982
90+ Days Past Due	19,233		16,660
Total Past Due	25,307		22,345
Current	906,148		850,197
Total Loans	931,455		872,542
90+ and Accruing	5,680	[1]	12,403	[1]
Commercial Other [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	3,134		2,801
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	2,351		344
60-89 Days Past Due	2,410		422
90+ Days Past Due	5,466		6,156
Total Past Due	10,227		6,922
Current	336,808		367,959
Total Loans	347,035		374,881
90+ and Accruing	2,882	[1]	3,723	[1]
Equipment Lease Financing [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	0		0
60-89 Days Past Due	0		0
90+ Days Past Due	0		0
Total Past Due	0		0
Current	10,055		8,840
Total Loans	10,055		8,840
90+ and Accruing	0	[1]	0	[1]
Real Estate Construction [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	413		481
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	122		81
60-89 Days Past Due	188		383
90+ Days Past Due	1,004		694
Total Past Due	1,314		1,158
Current	60,791		54,917
Total Loans	62,105		56,075
90+ and Accruing	607	[1]	213	[1]
Real Estate Mortgage [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	6,019		5,152
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	1,402		1,274
60-89 Days Past Due	4,350		4,419
90+ Days Past Due	12,914		9,346
Total Past Due	18,666		15,039
Current	684,657		682,562
Total Loans	703,323		697,601
90+ and Accruing	8,361	[1]	4,847	[1]
Home Equity [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	483		429
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	760		786
60-89 Days Past Due	305		330
90+ Days Past Due	723		737
Total Past Due	1,788		1,853
Current	86,503		83,027
Total Loans	88,291		84,880
90+ and Accruing	425	[1]	324	[1]
Consumer Direct [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	1,349		1,063
60-89 Days Past Due	363		291
90+ Days Past Due	43		119
Total Past Due	1,755		1,473
Current	119,612		120,742
Total Loans	121,367		122,215
90+ and Accruing	43	[1]	119	[1]
Consumer Indirect [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	2,009		2,750
60-89 Days Past Due	371		668
90+ Days Past Due	358		297
Total Past Due	2,738		3,715
Current	297,288		283,826
Total Loans	300,026		287,541
90+ and Accruing	$ 358	[1]	$ 297	[1]

[1] 90+ and Accruing are also included in 90+ Days Past Due column.