Allowance for Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				$ 68,172				$ 69,569	$ 68,172	$ 69,569	$ 72,454
Charge-offs									(21,462)	(25,067)	(24,722)
Recoveries									12,555	15,079	15,110
Provision for loan and lease losses	$ 18	$ 1,866	$ 3,640	5,254	$ 2,349	$ 2,831	$ 2,202	1,209	10,778	8,591	6,727
Balance at the end of year	70,043				68,172				70,043	68,172	69,569
Specific Reserve	761				653				761	653	241
General Allocation	69,282				67,519				69,282	67,519	69,328
Consumer [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				3,531				3,180	3,531	3,180	2,547
Charge-offs									(1,238)	(2,066)	(2,774)
Recoveries									933	931	1,353
Provision for loan and lease losses									308	1,486	2,054
Balance at the end of year	3,534				3,531				3,534	3,531	3,180
Specific Reserve	57				15				57	15	0
General Allocation	3,477				3,516				3,477	3,516	3,180
Purchased Credit Impaired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				13,726				16,336	13,726	16,336	20,174
Charge-offs									(9,944)	(13,854)	(14,436)
Recoveries									7,004	7,329	7,721
Provision for loan and lease losses									(271)	3,915	2,877
Balance at the end of year	10,515				13,726				10,515	13,726	16,336
Specific Reserve	0				0				0	0	0
General Allocation	10,515				13,726				10,515	13,726	16,336
Unallocated Financing Receivables [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				569				1,844	569	1,844	1,655
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for loan and lease losses									(343)	(1,275)	189
Balance at the end of year	226				569				226	569	1,844
Specific Reserve	0				0				0	0	0
General Allocation	226				569				226	569	1,844
Commercial business: Secured loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				32,321				25,923	32,321	25,923	31,027
Charge-offs									(9,993)	(7,486)	(4,159)
Recoveries									2,483	2,069	2,637
Provision for loan and lease losses									11,239	11,815	(3,582)
Balance at the end of year	36,050				32,321				36,050	32,321	25,923
Specific Reserve	664				321				664	321	25
General Allocation	35,386				32,000				35,386	32,000	25,898
Commercial business: Unsecured loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				1,299				927	1,299	927	696
Charge-offs									(75)	(780)	(130)
Recoveries									162	267	370
Provision for loan and lease losses									(426)	885	(9)
Balance at the end of year	960				1,299				960	1,299	927
Specific Reserve	0				0				0	0	2
General Allocation	960				1,299				960	1,299	925
Real estate: One-to-four family residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				916				2,281	916	2,281	1,252
Charge-offs									(35)	(376)	(230)
Recoveries									171	307	159
Provision for loan and lease losses									(453)	(1,296)	1,100
Balance at the end of year	599				916				599	916	2,281
Specific Reserve	12				314				12	314	120
General Allocation	587				602				587	602	2,161
Real estate: Commercial and multifamily residential: Commercial land [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				1,178				799	1,178	799	489
Charge-offs									(26)	0	(29)
Recoveries									2	291	70
Provision for loan and lease losses									643	88	269
Balance at the end of year	1,797				1,178				1,797	1,178	799
Specific Reserve	0				0				0	0	0
General Allocation	1,797				1,178				1,797	1,178	799
Real estate: Commercial and multifamiIy residential: Income property [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				6,616				9,159	6,616	9,159	9,234
Charge-offs									0	(390)	(1,934)
Recoveries									966	3,568	819
Provision for loan and lease losses									(240)	(5,721)	1,040
Balance at the end of year	7,342				6,616				7,342	6,616	9,159
Specific Reserve	27				0				27	0	0
General Allocation	7,315				6,616				7,315	6,616	9,159
Real estate: Commercial and multifamiIy residential: Owner occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				5,550				5,007	5,550	5,007	3,605
Charge-offs									(63)	(115)	(1,030)
Recoveries									434	116	51
Provision for loan and lease losses									518	542	2,381
Balance at the end of year	6,439				5,550				6,439	5,550	5,007
Specific Reserve	0				0				0	0	27
General Allocation	6,439				5,550				6,439	5,550	4,980
Real estate construction: One-to-four family residential: Land and acquisition [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				339				1,197	339	1,197	610
Charge-offs									(88)	0	0
Recoveries									57	103	740
Provision for loan and lease losses									8	(961)	(153)
Balance at the end of year	316				339				316	339	1,197
Specific Reserve	1				0				1	0	67
General Allocation	315				339				315	339	1,130
Real estate construction: One-to-four family residential: Residential construction [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				733				1,860	733	1,860	822
Charge-offs									0	0	0
Recoveries									234	90	1,190
Provision for loan and lease losses									(298)	(1,217)	(152)
Balance at the end of year	669				733				669	733	1,860
Specific Reserve	0				3				0	3	0
General Allocation	669				730				669	730	1,860
Real estate construction: Commercial and multifamily residential: Income property [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				388				622	388	622	285
Charge-offs									0	0	0
Recoveries									109	8	0
Provision for loan and lease losses									(93)	(242)	337
Balance at the end of year	404				388				404	388	622
Specific Reserve	0				0				0	0	0
General Allocation	404				388				404	388	622
Real estate construction: Commercial and multifamily residential: Owner occupied [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				$ 1,006				$ 434	1,006	434	58
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for loan and lease losses									186	572	376
Balance at the end of year	1,192				1,006				1,192	1,006	434
Specific Reserve	0				0				0	0	0
General Allocation	$ 1,192				$ 1,006				$ 1,192	$ 1,006	$ 434