Loans and Allowance for Loan and Lease Losses (Schedule of Financing Receivables Past Due) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable Investment Past Due [Line Items]
Recorded Investment, Total	$ 244,905	$ 116,531
Financing Receivable, 90 Days or More Past Due, Still Accruing	531,000	219,000
Loans, Current	22,359,032	21,676,200
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	23,154,988	21,977,008
1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	4,887,618	4,640,771
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	4,953,936	4,664,920
US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	93,560	31,348
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	698,644	266,729
Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,320	1,393
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	1,320	1,393
Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Loans, Current	7,219	15,947
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	7,219	15,947
Multi-family
Financing Receivable Investment Past Due [Line Items]
Loans, Current	2,217,705	2,585,421
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	2,217,705	2,585,421
Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	5,015,458	4,682,443
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	5,030,904	4,688,880
Construction and land
Financing Receivable Investment Past Due [Line Items]
Loans, Current	240,647	224,828
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	243,925	226,840
Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	2,041,352	2,106,104
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	2,062,808	2,119,880
Commercial and Industrial Sector [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	4,595,847	4,341,304
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	4,655,349	4,358,526
Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,202,430	1,462,655
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	1,202,430	1,462,655
Bridge - franchise finance [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	610,315	516,077
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	627,482	517,305
Bridge - equipment finance [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	677,089	636,235
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	684,794	636,838
Mortgage warehouse lending [Member]
Financing Receivable Investment Past Due [Line Items]
Loans, Current	768,472	431,674
Financing Receivable, Past Due		0
Loans and lease receivable, net of premiums, discounts and deferred fees and costs	768,472	431,674
30 - 59 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	108,571	38,110
30 - 59 Days Past Due | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	45,634	15,070
30 - 59 Days Past Due | US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	45,347	8,342
30 - 59 Days Past Due | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
30 - 59 Days Past Due | Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
30 - 59 Days Past Due | Multi-family
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
30 - 59 Days Past Due | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	3,621
30 - 59 Days Past Due | Construction and land
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	2,396	916
30 - 59 Days Past Due | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	1,336	2,826
30 - 59 Days Past Due | Commercial and Industrial Sector [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	2,313	6,732
30 - 59 Days Past Due | Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
30 - 59 Days Past Due | Bridge - franchise finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	3,840	0
30 - 59 Days Past Due | Bridge - equipment finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	7,705	603
30 - 59 Days Past Due | Mortgage warehouse lending [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0
60 - 89 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	52,154	14,384
60 - 89 Days Past Due | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	9,578	2,126
60 - 89 Days Past Due | US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	30,426	8,871
60 - 89 Days Past Due | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
60 - 89 Days Past Due | Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
60 - 89 Days Past Due | Multi-family
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
60 - 89 Days Past Due | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	928	1,374
60 - 89 Days Past Due | Construction and land
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
60 - 89 Days Past Due | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	4,420	1,087
60 - 89 Days Past Due | Commercial and Industrial Sector [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	4,301	926
60 - 89 Days Past Due | Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
60 - 89 Days Past Due | Bridge - franchise finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	2,501	0
60 - 89 Days Past Due | Bridge - equipment finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
60 - 89 Days Past Due | Mortgage warehouse lending [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0
90 Days or More Past Due
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	635,231	248,314
90 Days or More Past Due | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	11,106	6,953
90 Days or More Past Due | US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	529,000	218,168
Financing Receivable, Past Due	529,311
90 Days or More Past Due | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
90 Days or More Past Due | Other Consumer Loans
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
90 Days or More Past Due | Multi-family
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, 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, Past Due	14,518	1,442
90 Days or More Past Due | Construction and land
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	882	1,096
90 Days or More Past Due | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	15,700	9,863
90 Days or More Past Due | Commercial and Industrial Sector [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	52,888	9,564
90 Days or More Past Due | Pinnacle Public Finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
90 Days or More Past Due | Bridge - franchise finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	10,826	1,228
90 Days or More Past Due | Bridge - equipment finance [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0	0
90 Days or More Past Due | Mortgage warehouse lending [Member]
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, Past Due	0
Small business finance [Member]
Financing Receivable Investment Past Due [Line Items]
Recorded Investment, Total	46,100	13,100
Small business finance [Member] | 90 Days or More Past Due
Financing Receivable Investment Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 36,300	$ 8,800