Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Loan and Lease Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 70,043	$ 68,172
Charged-offs	(3,815)	(6,905)
Recoveries	2,018	2,743
Provision for loan and lease losses	2,775	5,254
Ending balance	71,021	69,264
Specific Reserve	94	2,515
General Allocation	70,927	66,749
Secured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	36,050	32,321
Charged-offs	(1,109)	(3,770)
Recoveries	297	611
Provision for loan and lease losses	434	2,952
Ending balance	35,672	32,114
Specific Reserve	0	2,500
General Allocation	35,672	29,614
Unsecured Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	960	1,299
Charged-offs	(18)	(3)
Recoveries	68	51
Provision for loan and lease losses	178	(47)
Ending balance	1,188	1,300
Specific Reserve	0	0
General Allocation	1,188	1,300
One-to-Four Family Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	599	916
Charged-offs	(307)	0
Recoveries	117	41
Provision for loan and lease losses	236	(303)
Ending balance	645	654
Specific Reserve	11	0
General Allocation	634	654
Commercial Land [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,797	1,178
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	491	84
Ending balance	2,288	1,262
Specific Reserve	0	0
General Allocation	2,288	1,262
Income Property Multifamily [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,342	6,616
Charged-offs	0	0
Recoveries	35	61
Provision for loan and lease losses	(574)	725
Ending balance	6,803	7,402
Specific Reserve	26	0
General Allocation	6,777	7,402
Owner Occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	6,439	5,550
Charged-offs	0	0
Recoveries	43	8
Provision for loan and lease losses	52	528
Ending balance	6,534	6,086
Specific Reserve	0	0
General Allocation	6,534	6,086
Land And Acquisition [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	316	339
Charged-offs	(14)	0
Recoveries	20	51
Provision for loan and lease losses	187	250
Ending balance	509	640
Specific Reserve	0	0
General Allocation	509	640
Residential Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	669	733
Charged-offs	0	0
Recoveries	9	203
Provision for loan and lease losses	431	513
Ending balance	1,109	1,449
Specific Reserve	0	0
General Allocation	1,109	1,449
Income Property Multifamily Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	404	388
Charged-offs	0	0
Recoveries	0	1
Provision for loan and lease losses	378	326
Ending balance	782	715
Specific Reserve	0	0
General Allocation	782	715
Owner Occupied Construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,192	1,006
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	576	204
Ending balance	1,768	1,210
Specific Reserve	0	0
General Allocation	1,768	1,210
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,534	3,531
Charged-offs	(428)	(266)
Recoveries	285	165
Provision for loan and lease losses	(31)	(62)
Ending balance	3,360	3,368
Specific Reserve	57	15
General Allocation	3,303	3,353
Purchased Credit Impaired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,515	13,726
Charged-offs	(1,939)	(2,866)
Recoveries	1,144	1,551
Provision for loan and lease losses	(325)	653
Ending balance	9,395	13,064
Specific Reserve	0	0
General Allocation	9,395	13,064
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	226	569
Charged-offs	0	0
Recoveries	0	0
Provision for loan and lease losses	742	(569)
Ending balance	968	0
Specific Reserve	0	0
General Allocation	$ 968	$ 0