Loans and Allowance for Loan and Lease Losses (Schedule of Financing Receivables Past Due) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable Investment Past Due [Line Items]
Document Fiscal Year Focus	2018
Loans, Current	$ 21,475,490	$ 20,840,121
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Non-covered loans, net of premiums, discounts and deferred fees and costs	21,775,632	20,913,386
Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Loans, Current	15,947	19,958
Non-covered loans, net of premiums, discounts and deferred fees and costs	15,947	20,473
Multi-family
Financing Receivable Investment Past Due [Line Items]
Loans, Current	2,585,421	3,218,953
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,585,421	3,218,953
Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	4,682,443	4,464,967
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,688,880	4,474,801
Construction and land
Financing Receivable Investment Past Due [Line Items]
Loans, Current	224,828	309,309
Non-covered loans, net of premiums, discounts and deferred fees and costs	226,840	310,484
Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	2,106,104	2,004,397
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,119,880	2,012,742
Taxi medallion [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	155	88,394
Non-covered loans, net of premiums, discounts and deferred fees and costs	775	106,067
Other Commercial and industrial [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	4,772,823	4,025,784
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,789,425	4,031,760
Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,462,655	1,524,622
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,462,655	1,524,622
Bridge Funding Group [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,152,312	1,037,025
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,154,143	1,037,877
ACI loans | Residential Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	40	18,000
Non-Covered [Domain]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	700	1,900
Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	4,440,061	4,121,624
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,463,544	4,145,879
Non-Covered [Domain] | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,393	1,633
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,393	1,654
Non-ACI Loans, Covered [Member]
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	11,153	24,050
Non-ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	11,153	21,106
Covered loans net of premiums, discounts and deferred fees and costs	11,153	24,050
Non-ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	11,153	21,106
Covered loans net of premiums, discounts and deferred fees and costs	11,153	24,050
ACI Loans, Covered [Member]
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	190,223	479,068
ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	189,557	448,125
Covered loans net of premiums, discounts and deferred fees and costs	190,223	479,068
ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	189,557	448,125
Covered loans net of premiums, discounts and deferred fees and costs	190,223	479,068
30 - 59 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	37,776	37,292
30 - 59 Days Past Due | Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	15
30 - 59 Days Past Due | Multi-family
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
30 - 59 Days Past Due | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	3,621	7,549
30 - 59 Days Past Due | Construction and land
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	916	0
30 - 59 Days Past Due | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,826	1,292
30 - 59 Days Past Due | Taxi medallion [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	6,048
30 - 59 Days Past Due | Other Commercial and industrial [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	6,732	4,291
30 - 59 Days Past Due | Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
30 - 59 Days Past Due | Bridge Funding Group [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	603	852
30 - 59 Days Past Due | Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	14,736	15,613
30 - 59 Days Past Due | Non-Covered [Domain] | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	21
30 - 59 Days Past Due | Non-ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	1,603
30 - 59 Days Past Due | Non-ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	1,603
30 - 59 Days Past Due | ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	334	10,388
30 - 59 Days Past Due | ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	334	10,388
60 - 89 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	14,096	10,217
60 - 89 Days Past Due | Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | Multi-family
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,374	0
60 - 89 Days Past Due | Construction and land
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,087	499
60 - 89 Days Past Due | Taxi medallion [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	3,333
60 - 89 Days Past Due | Other Commercial and industrial [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	926	291
60 - 89 Days Past Due | Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | Bridge Funding Group [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,838	4,941
60 - 89 Days Past Due | Non-Covered [Domain] | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | Non-ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | Non-ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
60 - 89 Days Past Due | ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	288	2,719
60 - 89 Days Past Due | ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	288	2,719
90 Days or More Past Due
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	248,270	25,756
90 Days or More Past Due | Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	500
90 Days or More Past Due | Multi-family
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
90 Days or More Past Due | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,442	2,285
90 Days or More Past Due | Construction and land
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,096	1,175
90 Days or More Past Due | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	9,863	6,554
90 Days or More Past Due | Taxi medallion [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	620	8,292
90 Days or More Past Due | Other Commercial and industrial [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	8,944	1,394
90 Days or More Past Due | Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
90 Days or More Past Due | Bridge Funding Group [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,228	0
90 Days or More Past Due | Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	6,909	3,701
90 Days or More Past Due | Non-Covered [Domain] | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
90 Days or More Past Due | Non-ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	1,341
90 Days or More Past Due | Non-ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	1,341
90 Days or More Past Due | ACI Loans, Covered [Member] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	44	17,836
90 Days or More Past Due | ACI Loans, Covered [Member] | Residential Mortgage [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	44	17,836
US Government Agency Insured Loans [Member] | Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	31,348	23,455
Non-covered loans, net of premiums, discounts and deferred fees and costs	266,729	28,074
US Government Agency Insured Loans [Member] | 30 - 59 Days Past Due | Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	8,342	1,611
US Government Agency Insured Loans [Member] | 60 - 89 Days Past Due | Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	8,871	1,153
US Government Agency Insured Loans [Member] | 90 Days or More Past Due | Non-Covered [Domain] | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 218,168	$ 1,855