Bank subsidiary (Details 9) (USD $) In Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	$ 134,419	$ 134,419	$ 101,982
Unpaid principal balance	151,326	151,326	115,543
Related Allowance	5,220	5,220	3,460
Average recorded investment	125,351	120,640	97,791
Interest income recognized	1,699	3,415	5,286
Residential 1-4 family
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	24,655	24,655	22,122
Unpaid principal balance	32,407	32,407	28,609
Related Allowance	230	230	230
Average recorded investment	23,890	23,746	17,416
Interest income recognized	117	237	453
Residential 1-4 family | With no related allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	20,771	20,771	18,205
Unpaid principal balance	28,523	28,523	24,692
Average recorded investment	20,000	19,848	14,609
Interest income recognized	68	128	278
Residential 1-4 family | With an allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	3,884	3,884	3,917
Unpaid principal balance	3,884	3,884	3,917
Related Allowance	230	230	230
Average recorded investment	3,890	3,898	2,807
Interest income recognized	49	109	175
Commercial real estate
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	13,543	13,543	12,156
Unpaid principal balance	13,543	13,543	12,156
Average recorded investment	12,396	11,276	14,276
Interest income recognized	183	331	979
Commercial real estate | With no related allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	13,543	13,543	12,156
Unpaid principal balance	13,543	13,543	12,156
Average recorded investment	12,396	11,276	14,276
Interest income recognized	183	331	979
Home equity line of credit
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	543	543
Unpaid principal balance	1,422	1,422
Average recorded investment	654	615
Interest income recognized	1	1
Home equity line of credit | With no related allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	543	543
Unpaid principal balance	1,422	1,422
Average recorded investment	654	615
Interest income recognized	1	1
Residential land
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	41,058	41,058	38,818
Unpaid principal balance	49,334	49,334	45,892
Related Allowance	3,067	3,067	1,642
Average recorded investment	40,574	40,540	33,667
Interest income recognized	566	1,255	1,826
Residential land | With no related allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	32,310	32,310	33,777
Unpaid principal balance	40,526	40,526	40,802
Average recorded investment	32,092	33,177	29,914
Interest income recognized	420	939	1,499
Residential land | With an allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	8,748	8,748	5,041
Unpaid principal balance	8,808	8,808	5,090
Related Allowance	3,067	3,067	1,642
Average recorded investment	8,482	7,363	3,753
Interest income recognized	146	316	327
Commercial loans
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	54,620	54,620	28,886
Unpaid principal balance	54,620	54,620	28,886
Related Allowance	1,923	1,923	1,588
Average recorded investment	47,837	44,463	32,432
Interest income recognized	832	1,591	2,028
Commercial loans | With no related allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	43,665	43,665	22,041
Unpaid principal balance	43,665	43,665	22,041
Average recorded investment	39,419	37,284	29,636
Interest income recognized	702	1,361	1,846
Commercial loans | With an allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	10,955	10,955	6,845
Unpaid principal balance	10,955	10,955	6,845
Related Allowance	1,923	1,923	1,588
Average recorded investment	8,418	7,179	2,796
Interest income recognized	130	230	182
With no related allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	110,832	110,832	86,179
Unpaid principal balance	127,679	127,679	99,691
Average recorded investment	104,561	102,200	88,435
Interest income recognized	1,374	2,760	4,602
With an allowance recorded
Carrying amount and the total unpaid principal balance of impaired loans
Recorded investment	23,587	23,587	15,803
Unpaid principal balance	23,647	23,647	15,852
Related Allowance	5,220	5,220	3,460
Average recorded investment	20,790	18,440	9,356
Interest income recognized	$ 325	$ 655	$ 684