Fair Value Measurement (FV of financial instruments)(Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 37,906		$ 25,285	$ 22,051		$ 263,302
Assets:
Loans held for investment, net	1,510,169		1,308,974
Loans held for sale	385,110		620,799
Fair value of loans held for sale	385,110		607,578
Servicing Asset at Amortized Cost	9,403	9,239	8,097	7,725	7,655	7,112
Federal Home Loan Bank Stock	35,370		36,367
Deposits	2,098,076		1,976,835
Liabilities:
Advances from Federal Home Loan Banks	338,690		259,090
Long-term Debt	61,857		61,857
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Assets:
Servicing Asset at Amortized Cost			8,097
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Cash and cash equivalents	37,906		25,285
Loans held for investment	1,525,432		1,340,882
Fair value of loans held for sale			14,810
Servicing Asset at Amortized Cost	10,899		9,497
Federal Home Loan Bank Stock	35,370		36,367
Liabilities:
Deposits	1,982,714		1,979,925
Federal Home Loan Bank advances	341,555		263,209
Long-term debt	60,239		60,241
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member]
Assets:
Cash and cash equivalents	37,906		25,285
Loans held for investment			0
Fair value of loans held for sale			0
Servicing Asset at Amortized Cost			0
Federal Home Loan Bank Stock			0
Liabilities:
Deposits			0
Federal Home Loan Bank advances			0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure			0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member]
Assets:
Cash and cash equivalents			0
Loans held for investment			0
Fair value of loans held for sale			14,810
Servicing Asset at Amortized Cost			0
Federal Home Loan Bank Stock	35,370		36,367
Liabilities:
Deposits	1,982,714		1,979,925
Federal Home Loan Bank advances	341,555		263,209
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure			60,241
Long-term debt	60,239
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member]
Assets:
Cash and cash equivalents			0
Loans held for investment	1,525,432		1,340,882
Fair value of loans held for sale			0
Servicing Asset at Amortized Cost	10,899		9,497
Federal Home Loan Bank Stock			0
Liabilities:
Deposits			0
Federal Home Loan Bank advances			0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure			0
Multifamily Residential [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Assets:
Loans held for sale			13,221
Fair value of loans held for sale	$ 0