Allowance for Loan and Lease Losses - Loans that were Evaluated for Impairment by Loan Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Unpaid principal balance [Abstract]
With no related allowance recorded	$ 29,867	$ 25,029
With an allowance recorded	7,560	25,075
Recorded investment [Abstract]
With no related allowance recorded	19,349	19,423
With an allowance recorded	3,404	9,405
Related allowance
Related allowance	155	2,026
Average recorded investment [Abstract]
With no related allowance recorded	20,503	28,620
With an allowance recorded	6,485	4,602
Interest income recognized [Abstract]
With no related allowance recorded	27	359
With an allowance recorded	134	7
Commercial Real Estate [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	10,858	10,417
With an allowance recorded	0	4,136
Recorded investment [Abstract]
With no related allowance recorded	8,484	8,623
With an allowance recorded	0	2,335
Related allowance
Related allowance	0	835
Average recorded investment [Abstract]
With no related allowance recorded	8,961	11,163
With an allowance recorded	1,167	1,526
Interest income recognized [Abstract]
With no related allowance recorded	0	78
With an allowance recorded	18	0
Construction and Land Development [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	11,550	6,250
With an allowance recorded	0	6,180
Recorded investment [Abstract]
With no related allowance recorded	4,466	3,464
With an allowance recorded	0	2,479
Related allowance
Related allowance	0	820
Average recorded investment [Abstract]
With no related allowance recorded	3,957	10,059
With an allowance recorded	1,239	923
Interest income recognized [Abstract]
With no related allowance recorded	0	187
With an allowance recorded	14	0
Commercial and Industrial [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	7,459	7,790
With an allowance recorded	2,554	9,585
Recorded investment [Abstract]
With no related allowance recorded	6,399	6,820
With an allowance recorded	2,351	3,431
Related allowance
Related allowance	45	255
Average recorded investment [Abstract]
With no related allowance recorded	7,313	5,545
With an allowance recorded	2,979	682
Interest income recognized [Abstract]
With no related allowance recorded	0	73
With an allowance recorded	102	0
Multi Family [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded		0
With an allowance recorded		0
Recorded investment [Abstract]
With no related allowance recorded		0
With an allowance recorded		0
Related allowance
Related allowance		0
Average recorded investment [Abstract]
With no related allowance recorded		780
With an allowance recorded		383
Interest income recognized [Abstract]
With no related allowance recorded		0
With an allowance recorded		0
Residential real estate [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded	0	572
With an allowance recorded	530	685
Recorded investment [Abstract]
With no related allowance recorded	0	516
With an allowance recorded	431	478
Related allowance
Related allowance	13	14
Average recorded investment [Abstract]
With no related allowance recorded	272	490
With an allowance recorded	434	714
Interest income recognized [Abstract]
With no related allowance recorded	27	21
With an allowance recorded	0	7
Leases [Member]
Unpaid principal balance [Abstract]
With an allowance recorded	71	81
Recorded investment [Abstract]
With an allowance recorded	71	81
Related allowance
Related allowance	70	55
Average recorded investment [Abstract]
With an allowance recorded	74	86
Interest income recognized [Abstract]
With an allowance recorded	0	0
Tax Certificates [Member]
Unpaid principal balance [Abstract]
With no related allowance recorded		0
With an allowance recorded	4,405	4,408
Recorded investment [Abstract]
With no related allowance recorded		0
With an allowance recorded	551	601
Related allowance
Related allowance	27	47
Average recorded investment [Abstract]
With no related allowance recorded		583
With an allowance recorded	592	288
Interest income recognized [Abstract]
With no related allowance recorded		0
With an allowance recorded	$ 0	$ 0