Nature of Operations and Summary of Significant Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings per share
Net Income	$ 21,893	$ 20,312	$ 14,639	$ 11,655	$ 18,543	$ 20,537	$ 16,642	$ 10,816	$ 68,499	$ 66,538	$ 53,117
Weighted average common shares outstanding (in shares)	43,862,435	43,862,435	43,781,249	44,658,512	44,971,676	45,038,021	45,055,117	38,822,543	44,044,737	43,493,316	38,347,059
Basic Earnings Per Share (in USD per share)	$ 0.50	$ 0.46	$ 0.33	$ 0.26	$ 0.41	$ 0.46	$ 0.37	$ 0.28	$ 1.56	$ 1.53	$ 1.39
Diluted earnings per share
Net income available to common shareholders									$ 68,499	$ 66,538	$ 53,117
Effect of dilutive securities:
Weighted average common shares outstanding (in shares)	43,903,881	43,903,881	43,802,794	44,756,716	45,103,065	45,113,730	45,130,408	38,906,172	44,123,076	43,597,595	38,495,231
Diluted Earnings Per Share (in USD per share)	$ 0.50	$ 0.46	$ 0.33	$ 0.26	$ 0.41	$ 0.46	$ 0.37	$ 0.28	$ 1.55	$ 1.53	$ 1.38
Restricted stock
Effect of dilutive securities:
Effect of dilutive securities (in shares)									41,817	23,006	36,185
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)									36,522	81,273	111,987