Allowance for Loan and Lease Losses (Allocation of Allowance for Loan and Lease Losses) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	$ 200,905,000		$ 200,905,000		$ 233,394,000
Originated Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	138,929,000		138,929,000		145,485,000
ALLL for loans and leases individually evaluated for impairment	12,738,000		12,738,000		10,161,000
Financing Receivable, Individually Evaluated for Impairment	125,411,000		125,411,000		132,146,000
Average balance	128,431,000	162,334,000	128,357,000	157,018,000
Interest income recognized	1,139,000	2,021,000	3,782,000	6,112,000
Originated Loans | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	7,090,000		7,090,000		7,306,000
ALLL for loans and leases individually evaluated for impairment	382,000		382,000		103,000
Financing Receivable, Individually Evaluated for Impairment	2,068,000		2,068,000		2,272,000
Average balance	2,296,000	5,553,000	1,701,000	7,793,000
Interest income recognized	26,000	29,000	57,000	242,000
Originated Loans | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	94,021,000		94,021,000		103,522,000
ALLL for loans and leases individually evaluated for impairment	5,811,000		5,811,000		6,873,000
Financing Receivable, Individually Evaluated for Impairment	88,735,000		88,735,000		97,111,000
Average balance	90,318,000	117,584,000	86,131,000	107,929,000
Interest income recognized	806,000	1,575,000	2,522,000	4,413,000
Originated Loans | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	2,365,000		2,365,000		2,279,000
ALLL for loans and leases individually evaluated for impairment	173,000		173,000		209,000
Financing Receivable, Individually Evaluated for Impairment	1,966,000		1,966,000		1,878,000
Average balance	1,980,000	2,852,000	2,474,000	2,893,000
Interest income recognized	7,000	39,000	67,000	121,000
Originated Loans | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	12,563,000		12,563,000		10,393,000
ALLL for loans and leases individually evaluated for impairment	3,042,000		3,042,000		771,000
Financing Receivable, Individually Evaluated for Impairment	11,484,000		11,484,000		9,300,000
Average balance	11,699,000	12,136,000	14,227,000	13,811,000
Interest income recognized	108,000	127,000	461,000	533,000
Originated Loans | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	281,000		281,000		188,000
ALLL for loans and leases individually evaluated for impairment	151,000		151,000		54,000
Financing Receivable, Individually Evaluated for Impairment	281,000		281,000		188,000
Average balance	312,000	312,000	589,000	399,000
Interest income recognized	5,000	5,000	26,000	19,000
Originated Loans | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	40,000		40,000
ALLL for loans and leases individually evaluated for impairment	6,000		6,000		0
Financing Receivable, Individually Evaluated for Impairment	40,000		40,000		0
Average balance	42,000	0	29,000	0
Interest income recognized	1,000	0	2,000	0
Originated Loans | Noncommerical | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	15,260,000		15,260,000		15,939,000
ALLL for loans and leases individually evaluated for impairment	1,416,000		1,416,000		1,586,000
Financing Receivable, Individually Evaluated for Impairment	14,800,000		14,800,000		15,539,000
Average balance	15,071,000	15,137,000	15,525,000	15,441,000
Interest income recognized	111,000	181,000	395,000	253,000
Originated Loans | Noncommerical | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,498,000		1,498,000		1,108,000
ALLL for loans and leases individually evaluated for impairment	103,000		103,000		72,000
Financing Receivable, Individually Evaluated for Impairment	1,498,000		1,498,000		1,108,000
Average balance	1,942,000	943,000	1,902,000	907,000
Interest income recognized	27,000	14,000	77,000	39,000
Originated Loans | Noncommerical | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,719,000		4,719,000		3,596,000
ALLL for loans and leases individually evaluated for impairment	1,060,000		1,060,000		372,000
Financing Receivable, Individually Evaluated for Impairment	3,497,000		3,497,000		3,596,000
Average balance	3,708,000	6,564,000	4,069,000	6,337,000
Interest income recognized	29,000	47,000	105,000	459,000
Originated Loans | Noncommerical | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,092,000		1,092,000		1,154,000
ALLL for loans and leases individually evaluated for impairment	594,000		594,000		121,000
Financing Receivable, Individually Evaluated for Impairment	1,042,000		1,042,000		1,154,000
Average balance	1,063,000	1,253,000	1,710,000	1,508,000
Interest income recognized	19,000	4,000	70,000	33,000
Originated Loans | With A Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	84,936,000		84,936,000		83,678,000
Originated Loans | With A Recorded Allowance | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	1,379,000		1,379,000		1,025,000
Originated Loans | With A Recorded Allowance | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	56,845,000		56,845,000		57,819,000
Originated Loans | With A Recorded Allowance | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	720,000		720,000		783,000
Originated Loans | With A Recorded Allowance | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	10,272,000		10,272,000		7,197,000
Originated Loans | With A Recorded Allowance | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	281,000		281,000		133,000
Originated Loans | With A Recorded Allowance | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	40,000		40,000
Originated Loans | With A Recorded Allowance | Noncommerical | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	9,556,000		9,556,000		11,534,000
Originated Loans | With A Recorded Allowance | Noncommerical | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	1,323,000		1,323,000		651,000
Originated Loans | With A Recorded Allowance | Noncommerical | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	3,497,000		3,497,000		3,382,000
Originated Loans | With A Recorded Allowance | Noncommerical | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	1,023,000		1,023,000		1,154,000
Originated Loans | With No Recorded Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	40,475,000		40,475,000		48,468,000
Originated Loans | With No Recorded Allowance | Commercial | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	689,000		689,000		1,247,000
Originated Loans | With No Recorded Allowance | Commercial | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	31,890,000		31,890,000		39,292,000
Originated Loans | With No Recorded Allowance | Commercial | Other commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	1,246,000		1,246,000		1,095,000
Originated Loans | With No Recorded Allowance | Commercial | Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	1,212,000		1,212,000		2,103,000
Originated Loans | With No Recorded Allowance | Commercial | Lease financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	0		0		55,000
Originated Loans | With No Recorded Allowance | Commercial | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	0		0
Originated Loans | With No Recorded Allowance | Noncommerical | Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	5,244,000		5,244,000		4,005,000
Originated Loans | With No Recorded Allowance | Noncommerical | Construction and land development
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	175,000		175,000		457,000
Originated Loans | With No Recorded Allowance | Noncommerical | Revolving mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	0		0		214,000
Originated Loans | With No Recorded Allowance | Noncommerical | Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	19,000		19,000		0
Acquired Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans which have adverse change in expected cash flows	$ 532,000,000		$ 532,000,000		$ 459,900,000